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Old 08-19-2008, 04:12 PM   #1
Zora
Scooby Newbie
 
Member#: 74712
Join Date: Nov 2004
Chapter/Region: MAIC
Location: Sterling, VA
Vehicle:
2006 Saab 92x Aero
Obsidian Black Pearl

Default Help - EJ20G Data log inside

I was hoping someone could help me troubleshoot a poorly-running engine ('97 WRX GF8 motor w/5mt). Basically, the power is down, it stutters and doesn't want to pull. Runs rough. I collected some data with the Select Monitor scan tool (http://www.vwrx.com/index.php?pg=selectmonitor), but have no idea what the values should be. The scan tool has a very limited update rate (~1 sample/sec) and there are some missing values (NaN). Hopefully, at least some of this data will be helpful.
I'd appreciate any help - maybe a knowledgeable person will see something obvious that'll point to a problem. This was taken driving around for ~10min. on local roads.

Thank you!!!!!!!!!!!!!

Code:
1 = MPH
2 = RPM
3 = Ignition Advance (degrees BTDC)
4 = Airflow Sensor (V)
5 = Engine Load (%)
6 = Throttle Position (V)
7 = Injector Pulse Width (mS)
8 = ISU Duty Valve (% DC)
9 = O2 Average (mV)
10 = O2 Minimum (mV)
11 = O2 Maximum (mV)
12 = Knock Correction (degrees)
13 = A/F Correction (%)
14 = Atmospheric Pressure (bar)
15 = Manifold Relative Pressure (psi)
16 = Boost Solenoid Duty Cycle (% DC)

    1     2     3       4       5       6        7        8       9        10       11        12      13      14      15       16
---------------------------------------------------------------------------------------------------------------------------------


    0   925.00  15.00   0.21    25.88   0.43      2.30    34.38  146.40       0        0       0       0    0.99    -9.73       0
    0      NaN  15.00   0.20    21.96   0.43      2.30      NaN       0       0        0       0       0    0.99    -9.90       0
    0   775.00  15.00   0.18      NaN    NaN      2.30    32.81  146.40       0        0       0       0    0.99    -8.70       0
    0  1100.00  30.00   0.33    29.41    NaN      2.05    37.89  117.10       0        0       0       0    0.99   -10.90   90.63
    0  1675.00  36.00   0.33      NaN    NaN      2.05    38.28  126.90       0        0       0       0    0.99   -10.70       0
    0  2050.00  39.00   0.41    32.55   0.60      2.05      NaN       0       0        0       0       0    0.99   -10.50   90.63
    0  2200.00  40.00   0.62    38.82   0.78      2.82    42.58       0       0        0       0       0    0.99   -10.50       0
    0  2250.00  32.00   0.43    31.37    NaN       NaN    37.11  136.70       0   429.60       0       0    0.99    -8.53       0
    0  1075.00    NaN   1.00    47.06   1.00       NaN      NaN  117.10       0   410.10       0       0     NaN      NaN       0
    0  1400.00  15.00    NaN      NaN   0.43      2.30    35.55  136.70       0   390.60       0     NaN    0.99    -9.04       0
    0   825.00  15.00   0.21    26.27    NaN       NaN    35.55  136.70       0   351.50       0       0    0.99    -9.04       0
    0   725.00  15.00   0.20    21.57   0.43       NaN      NaN  136.70       0   332.00       0       0    0.99      NaN       0
    0   700.00  15.00    NaN    21.96   0.43      2.30    29.30       0       0        0       0       0    0.99    -8.70       0
    0   700.00  15.00   0.20      NaN   0.43      2.30      NaN       0       0   292.90       0       0    0.99      NaN       0
    0      NaN    NaN   0.20    21.18   0.43       NaN    38.28  136.70       0   253.90       0       0    0.99    -9.04       0
    0   750.00  15.00    NaN    25.88   0.43      2.30    36.33  126.90       0   234.30       0     NaN    0.99    -8.87       0
    0      NaN    NaN   0.18    25.49    NaN       NaN    36.72  126.90       0   195.30       0       0    0.99    -8.87       0
    0   725.00  18.00   0.39    24.71   0.43      2.05    37.89       0       0   175.70       0       0    0.99      NaN       0
    0  1050.00  13.00    NaN    25.10   0.43      2.05    38.28  136.70       0   156.20       0     NaN    0.99    -8.70   67.19
    0      NaN    NaN   0.29    27.06   0.43      2.05    38.28       0       0   136.70       0     NaN     NaN    -8.53       0
    0   750.00  15.00   0.21    23.14   0.43      2.30      NaN       0       0    97.66       0       0    0.99      NaN       0
    0   750.00  15.00    NaN      NaN   0.43      2.30    25.78  126.90       0    78.13       0     NaN    0.99    -8.87       0
    0   725.00  15.00   0.18      NaN    NaN      2.30    36.72  136.70       0    58.59       0       0    0.99    -8.53       0
    0   725.00  15.00   0.20      NaN    NaN      2.30    30.47  146.40       0    19.53       0       0    0.99    -8.87       0
    0   725.00  15.00   0.20    26.27   0.43      2.30    34.38  126.90       0        0       0     NaN    0.99    -8.53       0
    0   725.00  15.00   0.20      NaN    NaN      3.07    43.75  126.90       0        0       0       0    0.99      NaN       0
    0  1000.00    NaN    NaN    29.02   0.47      2.05    41.41  126.90       0    97.66       0     NaN    0.99    -9.21       0
 2.00      NaN  15.00   0.23    25.49   0.43      2.05    35.16  136.70       0   136.70       0     NaN    0.99    -8.02   84.38
 1.00  1250.00  15.00   0.29    27.84   0.43      2.05    41.02  126.90       0   117.10       0     NaN    0.99    -8.70   43.75
 1.00  1450.00  30.00   0.47      NaN    NaN      2.30    38.67  224.60       0        0       0       0    0.99      NaN       0
 4.00   975.00    NaN   0.23    25.88   0.43       NaN    35.16  126.90       0    58.59       0     NaN    0.99    -9.04   90.63
 1.00  1300.00  15.00   0.33    28.24   0.43      2.05    40.23  214.80       0   664.00       0       0    0.99      NaN   90.63
 2.00  1550.00  30.00   0.66    39.22   0.76       NaN      NaN  224.60       0   644.50       0       0    0.99   -11.60       0
10.00  1475.00    NaN    NaN    31.37   0.57      2.82    39.06       0       0        0       0       0    0.99    -9.73   90.63
  NaN      NaN  16.00   0.27    26.67   0.45      1.79    37.50   97.60       0   605.40       0     NaN    0.99   -11.60       0
12.00  1475.00  16.00   0.25    25.88   0.43       NaN    37.50   97.60       0   566.40       0       0    0.99   -10.00       0
  NaN  1550.00  34.00    NaN      NaN   0.47      1.79    38.28  107.40       0   546.80       0     NaN    0.99   -10.50   90.63
12.00  1450.00  31.00    NaN      NaN   0.94      5.12    42.97  312.50       0   527.30       0     NaN    0.99    -7.51   90.63
15.00  1750.00    NaN    NaN    27.84   0.43      0.51    39.06       0       0   507.80       0       0    0.99      NaN       0
10.00  1200.00  15.00    NaN      NaN   0.43      2.05    36.72  136.70       0   468.70       0     NaN    0.99    -7.85   90.63
 9.00      NaN    NaN   0.76    39.61   0.84       NaN    43.75  312.50       0   449.20       0       0    0.99    -5.12       0
  NaN  2175.00  38.00   0.90    43.92   0.78       NaN      NaN  136.70       0   429.60       0       0    0.99   -11.40       0
  NaN  2075.00  20.00   0.41    32.16   0.43       NaN    61.33  107.40       0   390.60       0       0    0.99   -10.20       0
14.00      NaN    NaN   0.23    26.27   1.11      2.30     5.08       0       0        0       0       0    0.99    -3.75   90.63
12.00      NaN    NaN   0.74    35.69   0.55      2.05    42.19  117.10       0   351.50       0     NaN    0.99    -9.90       0
17.00   850.00  15.00   0.23    23.14   0.43      2.30    33.98       0       0   332.00       0     NaN     NaN    -8.70       0
 7.00   825.00  18.00   0.49    38.04   0.76      4.35    43.75  283.20       0        0       0       0    0.99    -1.71   90.63
12.00  1575.00  29.00    NaN      NaN   0.76      2.30    60.16       0       0        0       0       0    0.99    -9.21       0
14.00   925.00  15.00   0.25    26.27   0.43      2.05    37.11       0       0        0       0       0    0.99    -9.04       0
10.00   850.00    NaN    NaN    40.78   0.94      5.38    42.58       0       0   527.30       0       0    0.99      NaN   90.63
16.00  1950.00  30.00    NaN      NaN   2.34      6.40    46.48  439.40   19.53   507.80       0     NaN     NaN    -2.05   52.34
25.00  2925.00    NaN    NaN    41.18   0.70      2.30    50.78  126.90       0   468.70       0     NaN    0.99   -11.60   52.34
  NaN      NaN  44.00   0.45    33.73   0.59      2.05      NaN       0   19.53   449.20       0       0    0.99      NaN   57.03
21.00  2600.00  43.00    NaN      NaN   0.45      1.54    94.53       0       0        0       0       0    0.99   -10.70       0
20.00  2150.00  32.00   0.39    31.37   0.43      0.51      NaN       0       0   390.60       0       0    0.99      NaN       0
10.00  1075.00  15.00   0.33    40.00   0.84      4.61    44.14  302.70       0   371.00       0     NaN    0.99     0.17   90.63
14.00  1800.00  28.00   1.31    50.59   1.82       NaN      NaN  419.90       0   351.50       0       0    0.99     1.88   52.34
22.00  2775.00  34.00   2.25    59.61   1.90       NaN      NaN  517.50   19.53   332.00       0     NaN    0.99     6.65   52.34
35.00  4350.00  28.00   4.77      NaN    NaN     11.52    94.53   68.36  820.30   839.80    2.00     NaN    0.99    -9.38   52.34
  NaN      NaN  35.00   3.30    69.41   3.77      9.98      NaN       0  195.30   839.80    1.00       0    0.99     9.38   58.20
53.00  4500.00    NaN    NaN    34.51   0.43      0.51    64.06       0       0        0       0       0    0.99   -10.40       0
43.00  1350.00  15.00   0.31    28.24   0.43      2.05      NaN       0       0   839.80       0    7.00    0.99      NaN       0
24.00  1850.00  31.00   0.65      NaN    NaN      7.42    42.97  410.10   97.66   820.30       0       0    0.99     1.37   90.63
26.00  1700.00  26.00    NaN    51.37    NaN       NaN    44.14  449.20       0   820.30       0       0    0.99      NaN   90.63
35.00  2225.00  29.00   1.70      NaN    NaN      6.91    45.31  468.70       0        0       0       0    0.99     4.10       0
  NaN  2775.00  31.00    NaN      NaN   3.96      8.45    51.95       0   19.53   820.30       0       0    0.99     7.51       0
52.00  3250.00  27.00   3.44    68.24   3.96      9.98    55.47       0  488.20   820.30       0       0    0.99      NaN   51.56
57.00  3475.00  37.00    NaN      NaN   0.43      0.51    94.53       0       0        0       0       0    0.99   -10.70       0
35.00  1900.00    NaN    NaN    27.84   0.43       NaN    30.08       0       0   820.30       0     NaN     NaN    -9.04       0
16.00   800.00  15.00   0.18    22.75   0.43      2.30      NaN       0       0   800.70       0   32.00    0.99    -9.21       0
  NaN   750.00  15.00   0.18    21.96   0.43      2.56    31.25  126.90       0   781.20       0     NaN    0.99    -5.63   90.63
 7.00  1700.00  31.00   0.68      NaN    NaN      1.79    40.63  214.80  234.30   781.20    1.00     NaN     NaN    -1.37   90.63
 9.00  1375.00  25.00   0.84      NaN    NaN      6.91    42.97  371.00  761.70   781.20    2.00   32.00     NaN     0.34   90.63
17.00  2125.00  32.00   1.47      NaN    NaN      5.63    48.83  400.30       0        0    2.00       0    0.99     1.54   52.34
26.00      NaN    NaN   4.39    74.90   3.40     11.26      NaN       0       0   820.30       0     NaN     NaN     5.46   52.34
42.00  3675.00  26.00   4.32      NaN    NaN     11.26    90.23   58.59  800.70   839.80       0       0     NaN      NaN   52.34
52.00  3225.00  44.00   0.68    35.29   0.49      1.28    52.73   68.36       0   820.30       0     NaN    0.99   -12.20       0
47.00  2775.00  32.00   0.45    33.73   0.43       NaN    73.44   87.89       0   820.30       0     NaN    0.99   -11.00       0
31.00  1825.00  35.00   0.33      NaN   0.68      3.07    43.75  224.60       0   820.30       0   24.00    0.99    -4.27   90.63
29.00  1825.00  28.00    NaN      NaN   2.15      6.40    44.14  449.20       0   859.30       0     NaN    0.99     2.56   90.63
34.00  2150.00  28.00    NaN      NaN   1.56      5.89    45.31       0       0        0       0   10.00    0.99    -2.05       0
  NaN  2325.00  32.00   1.80    55.29   1.91      6.66    46.88       0       0        0       0   11.00    0.99   -11.00   43.75
42.00  2650.00  34.00    NaN      NaN   2.21      7.42    50.78  507.80       0        0       0   24.00    0.99   -11.20   52.34
  NaN  2750.00  44.00   0.45    34.12    NaN       NaN    94.53   87.89       0   820.30       0       0    0.99   -11.20       0
43.00  2625.00  32.00    NaN    34.12   0.43      0.51    79.69   78.13       0   820.30       0     NaN    0.99   -11.40       0
  NaN      NaN  32.00   0.39    32.16   0.45      0.51    42.19   78.13       0   820.30       0     NaN     NaN   -11.20       0
39.00  2300.00    NaN    NaN    31.37   0.43      0.51      NaN       0       0   800.70       0       0    0.99    -0.17   67.19
27.00  2375.00    NaN    NaN    50.59   1.47       NaN      NaN  478.50       0   820.30       0     NaN     NaN     2.05   52.34
36.00  2950.00  44.00    NaN      NaN   0.43      0.51    94.53       0       0        0       0       0    0.99   -11.40       0
34.00      NaN    NaN   0.62    41.96   0.98      4.86    50.78  390.60  507.80   820.30       0     NaN    0.99     6.48   52.34
37.00  3325.00  26.00   3.83    72.55   3.87     11.01    62.50       0  273.40        0       0       0    0.99    10.07   58.20
52.00      NaN    NaN   0.43    34.51   0.60       NaN    57.03  498.00   78.13   820.30       0       0    0.99      NaN   52.34
60.00  3675.00  37.00    NaN      NaN   0.43      0.51    63.28   97.66       0   800.70       0     NaN    0.99    -9.21       0
53.00   775.00    NaN    NaN    23.53   0.43      2.30    31.64  117.10       0   800.70       0     NaN    0.99    -9.73       0
47.00   900.00    NaN    NaN    22.35   0.43      2.30    33.98       0   19.53        0       0   32.00    0.99    -0.85       0
43.00  2700.00  41.00    NaN    53.33   1.31      6.40
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Old 08-19-2008, 04:16 PM   #2
Zora
Scooby Newbie
 
Member#: 74712
Join Date: Nov 2004
Chapter/Region: MAIC
Location: Sterling, VA
Vehicle:
2006 Saab 92x Aero
Obsidian Black Pearl

Default

Continued...

Code:
43.00  2800.00  39.00   1.33    47.06   0.88      3.07      NaN       0   19.53   839.80       0   32.00     NaN      NaN   57.03
42.00  2600.00    NaN    NaN    38.43   0.72       NaN      NaN  156.20   19.53   820.30       0     NaN    0.99    -8.36   82.81
37.00  2300.00  40.00   0.76    42.35   0.82      4.10      NaN  214.80  332.00   800.70    1.00   32.00     NaN    -4.10   90.63
37.00  2300.00    NaN    NaN    48.63   1.07      6.14      NaN  253.90  800.70        0    1.00   32.00    0.99    -7.17       0
  NaN  2350.00  41.00   0.70    40.00   0.76       NaN      NaN  146.40  371.00   761.70    2.00   32.00    0.99    -9.56   71.09
39.00  2350.00  42.00    NaN      NaN   0.68      2.82    43.36  146.40       0   742.10       0     NaN    0.99    -6.48   71.09
  NaN      NaN  40.00   0.68    38.82    NaN      2.82    44.53       0  253.90        0       0   32.00    0.99    -8.87   71.09
39.00  2375.00  41.00   0.66    40.00   0.74      3.33    44.53       0   19.53        0       0     NaN     NaN   -10.50   90.63
37.00  2250.00  39.00   0.78      NaN    NaN      3.33    44.53  166.00       0        0    1.00   32.00     NaN   -10.70       0
35.00  2000.00  32.00   0.37    30.59   0.43       NaN    44.14  107.40       0   722.60       0     NaN     NaN    -8.53       0
  NaN      NaN  15.00   0.25    37.65    NaN       NaN    44.92  273.40   39.06   800.70       0   32.00    0.99    -0.85   90.63
15.00  1975.00  30.00   1.29      NaN    NaN      5.38    45.31  371.00       0   800.70       0       0     NaN      NaN   52.34
25.00  3025.00  35.00   2.38    61.18    NaN       NaN    58.59  576.10       0   800.70       0       0     NaN      NaN   58.20
40.00  5050.00  25.00   4.98    83.53   1.95       NaN    94.53   58.59       0   800.70       0     NaN    0.99   -11.60       0
46.00      NaN    NaN   0.31    26.27   0.43      2.05    31.64       0       0   781.20       0    7.00    0.99    -9.04       0
41.00   825.00  15.00   0.18      NaN   0.43      2.05    28.52  117.10       0   761.70       0     NaN    0.99    -9.90       0
41.00   800.00    NaN    NaN    21.18   0.43      2.30    30.08       0       0   742.10       0   32.00     NaN      NaN       0
16.00      NaN    NaN   0.86    19.22   0.74      4.35    44.14  400.30       0   839.80       0     NaN    0.99     2.56   71.09
  NaN      NaN  30.00   3.01    66.67   2.62       NaN      NaN  644.50       0   878.90    1.00       0    0.99      NaN   58.20
40.00  3900.00  44.00   1.07    59.61   2.97      7.42    55.86  566.40   19.53   878.90       0     NaN    0.99     9.73   52.34
47.00      NaN    NaN   4.98    80.78   3.85     12.80    94.53       0  800.70        0       0       0     NaN   -12.40   75.00
46.00      NaN    NaN   0.41    30.98   0.43      0.51    41.80   87.89       0   878.90       0     NaN    0.99    -8.70       0
29.00  1000.00  27.00   1.11      NaN    NaN      2.05    45.70  205.00       0        0       0   32.00    0.99    -3.24   90.63
27.00  1725.00  29.00   0.96    45.49   1.05      6.14    43.75       0  468.70        0       0   30.00    0.99    -1.88   90.63
29.00  1800.00  30.00   0.43    30.98   1.60       NaN    51.17  244.10   78.13   898.40       0     NaN    0.99    -1.71   71.09
  NaN      NaN  38.00   1.05    45.88    NaN      5.63      NaN       0  878.90   859.30    3.00   30.00    0.99    -3.41   71.09
  NaN      NaN  36.00   1.56    53.33   1.33       NaN      NaN  390.60       0   878.90    2.00       0     NaN    -0.17   52.34
34.00  2750.00  37.00    NaN    52.94   1.15      5.38      NaN       0   19.53   859.30       0   32.00    0.99    -4.95   52.34
35.00  2875.00  41.00    NaN      NaN   0.94      4.61    52.34  224.60       0   839.80       0     NaN    0.99    -5.80   52.34
34.00  2700.00  41.00   1.11    47.45   0.96      4.61      NaN       0  800.70   820.30    2.00   32.00    0.99    -6.31   52.34
32.00  2700.00  42.00   0.92    42.35   0.74      2.30    48.05       0  742.10        0       0   29.00    0.99   -12.10       0
  NaN  2325.00  32.00   0.41    32.16   0.43      0.51    57.81       0       0   800.70    1.00       0    0.99      NaN       0
24.00   700.00  15.00   0.18    23.92    NaN       NaN    42.58   97.66       0        0       0   18.00    0.99    -7.00   84.77
17.00  2075.00  36.00   0.88    43.92   0.92      5.12    45.31  273.40   78.13   839.80       0   25.00    0.99    -4.61   90.63
20.00  2375.00  39.00   0.88    41.96    NaN       NaN    43.75  136.70   39.06   820.30       0   32.00    0.99    -7.00   71.09
20.00  2500.00  38.00   1.27    50.98   1.15       NaN    50.78  322.20  664.00   839.80       0     NaN    0.99    -4.78   52.34
27.00  3200.00  43.00    NaN      NaN   0.68      3.07    46.09       0       0        0       0   30.00    0.99    -3.07   90.63
29.00      NaN    NaN   1.25    48.63   1.07      6.40    45.70       0  566.40        0       0   28.00    0.99      NaN   62.11
30.00  2525.00    NaN    NaN    31.37   0.43      0.51      NaN       0       0   878.90    2.00     NaN     NaN    -9.38       0
27.00   800.00    NaN   0.18    21.57   0.43      2.05    30.47       0       0        0       0   28.00    0.99    -9.90       0
  NaN      NaN  15.00   0.16    20.78   0.43      2.30    30.08   97.66       0   839.80       0     NaN    0.99   -10.00       0
21.00      NaN  15.00   0.14    20.78   0.43      2.30    26.95       0   19.53        0       0   32.00    0.99    -9.90       0
21.00   750.00    NaN    NaN    17.25   0.43      2.05    31.64       0   19.53        0       0   32.00    0.99    -9.90       0
  NaN      NaN  15.00   0.16    21.57   0.43       NaN    25.78  107.40   19.53   761.70       0     NaN     NaN    -9.73       0
11.00   675.00  15.00   0.14    23.14   0.43       NaN      NaN  117.10   19.53   722.60       0   32.00    0.99   -10.00       0
  NaN      NaN  38.00   0.43    40.78   0.74       NaN      NaN  234.30  820.30   859.30    1.00   32.00    0.99      NaN   90.63
 6.00  1625.00  28.00   1.23    49.80   1.37      6.40    47.66       0       0   839.80    1.00    7.00    0.99      NaN   90.63
19.00  2275.00  34.00   1.74      NaN    NaN      5.63    52.34  390.60       0   839.80       0       0    0.99      NaN   71.09
27.00  2275.00  35.00   1.37    51.37    NaN      5.12    46.88  361.30       0   820.30       0     NaN    0.99     0.17   52.34
35.00  2875.00  34.00   2.46    61.96    NaN       NaN    53.52  566.40  117.10   820.30       0       0    0.99     6.83   52.34
42.00  3600.00  43.00   0.60      NaN    NaN      3.58    50.78  234.30   19.53   820.30       0   30.00    0.99      NaN   52.34
45.00  2725.00  44.00   0.57    36.47   0.65      2.56    47.66  117.10       0   820.30    1.00   32.00     NaN      NaN   52.34
42.00      NaN  43.00   0.65    36.86   0.65      2.82    46.88       0  820.30        0    2.00   32.00     NaN      NaN       0
  NaN      NaN  39.00   1.02    46.27   0.74      3.07    46.09       0   58.59        0       0   32.00    0.99    -8.36   71.09
37.00  2350.00  41.00   0.68    39.61   0.76      3.33      NaN       0   19.53   800.70       0   32.00    0.99      NaN   90.63
37.00  2300.00  25.00    NaN    31.76   0.43      0.51    57.03   87.89       0   781.20       0     NaN    0.99   -11.20       0
29.00  1650.00  32.00    NaN      NaN   0.43      0.51      NaN       0       0   781.20       0     NaN     NaN     0.34   90.63
30.00  1975.00  29.00   1.47    51.37   1.68      6.14      NaN       0       0   761.70       0       0    0.99     3.24   62.11
39.00  2525.00  31.00   2.13    58.82   1.93      7.68    50.00       0       0   761.70       0       0    0.99     5.46   52.34
47.00      NaN    NaN   3.03    66.27   1.93      8.96      NaN       0  136.70  4980.00       0     NaN     NaN     7.51   52.34
60.00  3800.00  30.00    NaN      NaN   2.32     10.75    82.03  654.30       0   761.70       0     NaN    0.99   -12.40       0
  NaN      NaN    NaN   0.39    31.37   0.43       NaN      NaN   78.13       0   800.70       0       0    0.99   -11.40   43.75
  NaN      NaN    NaN   0.68    40.00   0.74      3.07    49.22  156.20   19.53   781.20       0     NaN     NaN    -9.04   52.34
43.00  2725.00  43.00   0.74    40.78    NaN       NaN    48.83  136.70  839.80   839.80       0     NaN     NaN   -10.00   52.34
43.00      NaN    NaN   0.60    38.43   0.70      3.07    48.83  136.70       0        0    3.00   20.00    0.99   -11.00       0
  NaN  2725.00 109.00    NaN      NaN   0.43      0.51      NaN       0       0   820.30    2.00     NaN    0.99   -11.20   43.75
  NaN  2375.00  42.00   0.37    31.76   0.57       NaN    41.80   97.66   19.53   820.30       0   32.00     NaN      NaN   71.09
40.00  2425.00    NaN    NaN    35.29   0.65      2.56    43.75       0       0   781.20    2.00   32.00     NaN      NaN   62.11
40.00  2450.00  42.00    NaN      NaN   0.62      2.56    42.97       0   39.06        0       0   32.00    0.99   -10.20       0
  NaN  2475.00  42.00   0.66    39.22   0.74       NaN      NaN  166.00  156.20   722.60    1.00     NaN    0.99    -8.53   57.03
42.00      NaN    NaN   0.76    41.18   0.78      3.84    50.78  166.00       0        0    2.00   15.00    0.99    -9.21       0
  NaN  2725.00  43.00   0.74    40.39   0.76       NaN    50.78  156.20  683.50   839.80       0     NaN    0.99   -11.60       0
45.00  2600.00  32.00   0.47    34.12   0.43      0.51      NaN       0       0   839.80       0     NaN    0.99      NaN   99.61
32.00  2000.00  34.00    NaN    46.67   1.09      5.89    44.92  351.50       0   820.30       0     NaN    0.99    -0.34   90.63
34.00  2075.00  31.00   1.33    50.59   1.31      5.63      NaN       0       0   820.30       0       0    0.99     0.17   90.63
35.00  2150.00  33.00    NaN      NaN   1.35      5.38    44.92       0       0   820.30       0   25.00    0.99    -1.88   90.63
  NaN      NaN    NaN    NaN      NaN    NaN       NaN    45.31  312.50  859.30   859.30       0     NaN    0.99    -2.39   90.63
36.00  2225.00  35.00    NaN    50.59   1.19       NaN      NaN   87.89       0   859.30       0       0    0.99   -10.90       0
36.00  2175.00  39.00   0.37    32.16    NaN       NaN    60.16   87.89       0   859.30       0     NaN    0.99   -10.90       0
31.00  1875.00  32.00   0.35      NaN    NaN      1.79    54.69   87.89       0        0       0   21.00    0.99      NaN   90.63
30.00  1875.00  34.00   0.76      NaN   0.84      4.86      NaN       0   19.53   820.30       0   30.00    0.99    -3.75       0
  NaN  2150.00  36.00   0.98    43.14   0.80      4.35    45.70  195.30       0   800.70       0     NaN    0.99   -10.50       0
34.00   975.00    NaN    NaN    24.71   0.43      2.30    25.78       0       0        0       0   16.00    0.99    -9.38       0
22.00   725.00    NaN    NaN    19.22   0.68      7.68    42.58       0       0   820.30       0   32.00    0.99    -4.27   90.63
16.00  1975.00  34.00   0.92    44.31   1.02      5.38    45.31       0  839.80   839.80    1.00   32.00    0.99    -3.24   57.03
21.00      NaN    NaN   0.47    44.31   0.96       NaN    44.53  322.20   58.59   839.80       0     NaN    0.99    -2.90       0
27.00  2150.00  37.00   0.92      NaN    NaN      5.89    45.31  263.60  800.70   839.80    1.00       0     NaN      NaN   73.05
27.00  1675.00  30.00   0.94    45.10   1.02      6.14      NaN  390.60   97.66   820.30       0   32.00    0.99      NaN   90.63
30.00  1950.00    NaN   1.05    45.88   0.98       NaN    44.53  341.80  703.10   820.30    1.00   32.00    0.99    -1.88   90.63
34.00  2100.00  35.00   0.98      NaN    NaN      4.86    45.31  244.10       0        0    1.00   23.00    0.99      NaN   90.63
35.00  2150.00  38.00   0.76    41.18    NaN       NaN    43.75   87.89   19.53   839.80    1.00       0    0.99   -10.50       0
36.00  1025.00  15.00   0.21    24.31    NaN       NaN    34.38  117.10       0   839.80       0   13.00    0.99    -9.73       0
36.00   800.00  15.00   0.16    22.75   0.43      2.05      NaN       0       0   800.70       0   32.00     NaN      NaN       0
35.00   750.00    NaN    NaN    20.39   0.43      2.05    32.03       0   19.53        0       0   32.00    0.99   -10.00       0
32.00   750.00  15.00   0.14    20.39   0.43      2.05    28.52       0       0   761.70       0   32.00    0.99      NaN   55.47
29.00  2125.00  36.00   1.21    31.76   0.45       NaN    46.09  283.20  625.00   839.80       0     NaN    0.99      NaN       0
  NaN  2500.00  38.00   1.27    49.41    NaN       NaN    49.61  292.90       0        0    2.00       0    0.99      NaN       0
35.00  1200.00  15.00   0.23    22.35   0.43      2.05      NaN       0       0   839.80       0   11.00    0.99    -9.56       0
34.00   725.00  15.00   0.16    21.57    NaN       NaN    25.78  107.40       0   820.30       0   31.00    0.99      NaN   55.47
36.00  1850.00  33.00   1.03    32.94   0.86       NaN      NaN  244.10  292.90   800.70       0   32.00    0.99    -5.29   90.63
39.00  2350.00  38.00   0.94    43.53   0.80      3.84    45.70  195.30       0   781.20       0     NaN    0.99    -7.51   71.09
39.00      NaN    NaN   0.68    40.00   0.74       NaN    45.31  175.70   39.06   761.70       0   32.00    0.99    -8.02   90.63
37.00  2275.00    NaN   0.72    40.78   0.78       NaN    45.70  195.30  820.30        0       0   26.00    0.99    -6.83   90.63
36.00      NaN    NaN   0.80    42.35   0.80      4.35      NaN       0  820.30   839.80    2.00   26.00    0.99    -7.17       0
  NaN  2225.00  37.00   1.13    47.84   1.02      5.89    45.31  302.70       0   878.90       0     NaN    0.99    -5.12   71.09
39.00      NaN    NaN   0.96    41.96   0.80       NaN    48.05  185.50   19.53   839.80    2.00   32.00    0.99   -10.90       0
  NaN  1275.00  15.00   0.23    23.14   0.43      1.79    34.38  117.10       0   839.80       0     NaN    0.99    -9.73       0
37.00   775.00    NaN    NaN    22.35   0.43      2.05    34.38  117.10       0   820.30       0   30.00    0.99   -10.00       0
  NaN   675.00  15.00   0.14    23.53    NaN       NaN    12.89  117.10   19.53   800.70       0     NaN    0.99    -9.73       0
21.00      NaN    NaN   0.16    22.35   0.92      6.91    42.58  380.80       0   839.80       0   32.00    0.99    -7.68       0
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Old 08-19-2008, 09:10 PM   #3
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Best guess I've got with that Data is a vacuum leak.

Evidenced by:

1. The +32 fuel correction for a large portion of the data

2. You never get lower than -12.2 psi manifold pressure (should be much lower in a decel situation which it was - .49V TPS @ 52 MPH) . Mine idles about -11psi, yours appears to be around -8.5psi.

3. Fairly low Airflow voltage readings at idle and other spots, .14 and .16 at the bottom of the second frame of data. Should be up around .8 to 1.0 at idle. That signifies quite a large leak.
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Old 08-19-2008, 09:20 PM   #4
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BTW, where did you get your parts for the translator and how much did they cost?
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Old 08-19-2008, 11:25 PM   #5
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The datalog values look highly suspect. I know there are a few parameter address errors in Kevin's ini files. I wouldn't trust the all of data.

Under what conditions does it stutter and not want to pull?

-Rob
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Old 08-20-2008, 02:08 PM   #6
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theonlygreat - the parts for the level translator I bought on ebay, there are bunch of premade kits. Cost was around $7. It is very straightforward to use, just need to figure out where the Tx, Rx, and 5V wires are in your ECU. Let me know if you need more help with this.

rob - the datalog is not perfect and I suspected as much, including unit conversions/etc., but it's all I have. At this point I don't know which of the parameters are 100% trustworthy.

The reason I eliminated a vacuum leak as a potential problem is because I took it to a shop and they did a pressure test on the intake system. They did find a leak in the uppipe, which was replaced. I was wondering what the manifold pressure should be at idle, so it's good to know that it's suspect. I guess I could take it to another shop to get a second opinion. Could this be caused by a leaking valve of some sort (IAC, bypass, etc.?)

The car used to stutter at high boost over 7.5psi, somewhere around the torque peak. A very similar problem was experienced by someone who found a pin hole in the intake plumbing before the turbo. Now, it's gotten worse. Whereas before the car would run fine if I didn't get into boost, now it's just running rough pretty much always, even if I am on the gas just a little. The symptoms get worse if I drive in high gear at low rpms. Also, there's a noticeable lack of power throughout the powerband.
I can get a slightly higher-frequency log if I turn off some of the parameters. Should I try to do that and with which parameters?
Thanks again guys.
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Old 08-20-2008, 10:27 PM   #7
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To test for a vacuum leak, buy a can of carb clean and spray it around the engine with it running. You will hear the car rev up a little or sometimes it will die if you spray it on or around the spot it is leaking at... Not sure what they would call the up-pipe, but on a turbo Subaru that is part of the exhaust system.

When checking for vacuum leaks I'd pay special attention to the intake piping going from the turbo to the intercooler. That is a fragile and difficult part of the system to get to.

You may just have a misfire, that wouldn't really show up in a datalog. Maybe examine the spark plugs.

As for another log, remove the knock correction, isu duty, injector pulse width, engine load, O2 min/max.
Maybe add coolant temp.

I am not very confident in the spark advance number... it should retard a little under boost but it seems to keep advancing. Maybe you should try a knock sensor since it seems to be not doing much of anything and it's only about $30 at your local parts store.

Last edited by theonlygreat; 08-21-2008 at 10:00 AM.
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Old 08-24-2008, 08:12 PM   #8
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Well, thanks for all the advice. I decided to take the car to my mechanic for a complete intake and fuel system check ($40) and if necessary a cleaning of the fuel system, including the injectors. I've asked him specifically to check the intake system thoroughly for leaks and hopefully he has the means to do that (I mean, every shop should be able to, right?).

If that doesn't yield any results, I'll try logging some more data.
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Old 08-24-2008, 10:50 PM   #9
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Having them clean the fuel system is highly unlikely to fix your problem FYI. Don't have them fix anything if that is all they recommend after checking it out.
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Old 08-25-2008, 01:16 PM   #10
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Well, I asked my mechanic to call me back after doing the check and he did. The fuel system and intake check out - no leaks or clogs. However... one of the injectors is dead, some sort of electrical problem at the injector itself, because it does get proper power.
At least this shed some light on the problem. Now gotta find a set of injectors that will work on a '97 wrx ej20g motor...
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Old 12-10-2008, 10:09 AM   #11
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You guys have been so helpful, I'm back for more advice. :-) I replaced all my injectors with the sti sidefeed ones, just because this was easier than looking for a single original ej20g injector. Now, the car is running on all four cylinders, obviously much better than before, but still not 100%.

Now, the issue is the following. The car runs and accelerates fine until the boost builds up to about 7.5 psi, at which point it starts stumbling if I stay on the gas. When it stumbles, it feels like combustion just stops altogether for brief periods of time, but if I let up on the gas it resumes and the engine starts pulling again. In 5th gear and WOT, the stumbling will start at around 2750 rpm. This will happen in lower gears as well, but at higher rpm. The stumbling is definitely coupled to throttle position and boost.
My first impulse is to check the spark plugs and wires. Anything else I should do? Is there an easy way to check if the IAC or bypass valves are bad?

Thanks!
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Old 12-10-2008, 12:34 PM   #12
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what em are you using with the 550s (vs 440 stock injectors)
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Old 12-10-2008, 02:11 PM   #13
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Quote:
Originally Posted by Jaxx View Post
what em are you using with the 550s (vs 440 stock injectors)
Just the OEM ecu... is that bad?
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Old 12-10-2008, 03:36 PM   #14
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check your plugs, gap them down to .026, see if that changes anything.
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Old 12-10-2008, 11:29 PM   #15
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I have heard that some ECUs can cope with 550s over 440s but that seems unlikely. The ECU will still be using the same duty cycle as the 440s so adding an extra 110cc would cause a rich condition.
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Old 12-11-2008, 12:25 AM   #16
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I've got a spare set of 440s that I don't need. Let me know if this would help you out.
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Old 12-11-2008, 01:31 AM   #17
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+1 on spark plug gap, low rpm and wot = high load. Had this issue with copper ngks about every 6 months, sometimes sooner, I replace them.
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Old 12-11-2008, 09:48 AM   #18
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Quote:
Originally Posted by beaviscih View Post
I've got a spare set of 440s that I don't need. Let me know if this would help you out.
Argh, where were you a month ago! If nothing else helps, I might take you up on that offer.

Will check the plugs, thanks everyone.

Going back to the ECU not being able to manage the larger injectors properly... let's say there is a rich condition because the duty cycle is the same as it was before, should it still cause this kind of stumbling? Also, I have a hard time believing there is not some kind of feedback system that regulates the injector duty cycle...
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Old 12-11-2008, 08:47 PM   #19
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definatly check the TPS!!!!!! I have a problem at idle in gear(AUTO) I have to really lightly touch the accel to stop stalling if I put my foot on it like in a regular car it will stall!! but you were saying that the point is different (RPM"S) in different gears???? is it seem constant with pedal pressure check the plug! and take it off and apart to see if the wiper is dirty???? I think that the one off the ej22t is the same???? (I could be wrong as I have'nt tried that yet!) I think the # off the one on my ej20g is the same as the one on my ej22t!!!??? as it is also older than yours too!!! but it may be hard too find one for an JDM over here????? but that sound's highly suspect too me!!
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Old 12-11-2008, 10:32 PM   #20
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The only way the ECU would know you were running bigger injectors is if you tell it you are running bigger injectors through tuning. Your car does not have a wideband 02 and has no way of knowing there is too much extra fuel. Your MAF sensor meters air and adds the right amount of fuel assuming you have 440s in the car. A rich condition can cause stumbling for sure. Another thing that may be causing your stumbling is your coils. I would go back to 440s and then if your are still having issues go from there. 550s will cause driveablity issues either way. Ask Rob on here about 550s on a stock ECU.
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Old 12-13-2008, 10:23 AM   #21
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Quote:
Originally Posted by sniper512 View Post
The only way the ECU would know you were running bigger injectors is if you tell it you are running bigger injectors through tuning. Your car does not have a wideband 02 and has no way of knowing there is too much extra fuel. Your MAF sensor meters air and adds the right amount of fuel assuming you have 440s in the car. A rich condition can cause stumbling for sure. Another thing that may be causing your stumbling is your coils. I would go back to 440s and then if your are still having issues go from there. 550s will cause driveablity issues either way. Ask Rob on here about 550s on a stock ECU.
What about the regular O2 sensor? That's not used to check the AFR by the ECU?
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Old 12-13-2008, 10:47 AM   #22
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Yes the stock 02 sensor will adjust a very small amount. Nowhere near enough to adjust for an extra 110cc. Narrow band(stock) 02 sensors read full voltage when the engine goes even a bit rich and have low voltage when just slightly lean. Where as a Wide band 02 will detect rich and lean conditions in their severity. So basically our ECU knows whether the engine is lean or rich but doesn't know how rich or lean it is to adjust the map very much at all.
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Old 12-16-2008, 04:53 PM   #23
rob
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It tastes like burning

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The stock O2 sensor works for closed loop (idle and low load) situations. Other than, the injector pulse width is determined from the airflow and RPM. I have '04STi injectors installed at the moment and have done quite a bit of WB tests while trying to come up with a 550 ECU tune.

For CL operations, the stock ECU w/550cc injectors is able to correct the mixture enough to have the same AFR as 440s. However once you start getting into boost, the AFR starts to drop and I see top end values as rich at 9.6 which is plenty rich to cause the symptoms you describe.

MY WB sensor died, so I have to wait a couple more weeks before my 550 chip tune is done. PM me on the side if you are interested.

-Rob
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Old 04-27-2009, 10:45 AM   #24
Zora
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Obsidian Black Pearl

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Well, this is a long-overdue update, but the problem is gone. I changed the oil and added a can of Seafoam and it's been running much better since. I hate that I still don't really know what was wrong, but at the same time I'm happy that I can drive the car again.
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