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Old 04-13-2006, 06:26 PM   #1
bustaman
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Member#: 27264
Join Date: Oct 2002
Chapter/Region: Tri-State
Location: Long Island
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2005 STi
CGM

Question u think my WB o2 sensor is bad??

was at the track yesterday and logging all of my runs, and for some reason everything was checking out, but for some reason every time i would get into 5th gear, the WB data from the Tuner tells me that my a/f is completely lean throughout the whole gear!! now there are no counts of knock, and granted my idcs are pretty maxxed, but i dont think the a/f could really be that lean with out something blowing up at full throttle thoughout the whole gear, and i made a bunch of passes and the same thing kept happening. The thing that bothers me is that it kept doing this at the track when i was logging, and then after i left the track i tried doing some more logging, and it would do the same, but if i unplugged the data cable from the tuner and just watched the readout on the tuner box it told me what the a/f was all throughout 5th gear..... does this mean that my sensor is just messed up and its time for a new one, or wtf else could it be??


heres some log of it:
Code:
4578  -5.0 3.0  33  10    00   +33.6   30.7 +22.0  -0.1 325.00 3.3  11.34
 4636  -6.9 3.8  78  10    00   +20.8   62.7 +22.0  -0.1 375.00 3.9  11.24
 4721  -2.3 4.3  91  30    00   +19.4   92.5 +21.5  +0.6 375.00 4.5  11.37
 4714  +5.3 4.6  93  70    00   +19.6  ---.- +19.5  -0.2 375.00 4.5  11.06
 4960 +12.6 4.6  93  90    00   +19.4   97.5 +19.7  -1.9 375.00 4.5  10.89
 5058 +17.0 4.6  93  90    00   +20.3  ---.- +20.5  -2.6 375.00 4.5  11.01
 5136 +19.3 4.6  87  90    00   +20.3   98.1 +20.9  -2.6 375.00 4.4  11.11
 5249 +19.3 4.6  85  90    00   +20.2  ---.- +21.0  -2.5 375.00 4.5  11.14
 5630 +18.5 4.6   9  00    00   +19.6   55.5 ECU.   +0.0 ECU.   4.2  11.18
 4810 +12.0 3.4   2  00    00   +23.4  ---.- ECU.   +0.0 ECU.   3.2  11.58
 4450  +4.6 3.1   2  00    00   +23.4  ---.- ECU.   +0.0 ECU.   3.0  12.02
 4110  -1.9 3.0  48  10    00   +33.4   39.4 +21.0  +0.0 ECU.   3.4  11.73
 3963  -4.8 3.7  95  10    00   +14.9   46.9 +21.0  +0.0 375.00 3.8  11.81
 3912  -0.8 4.0  95  40    00   +12.2   71.9 +19.4  +1.0 375.00 4.2  12.05
 3885  +5.9 4.4  97  70    00   +11.9   85.7 +17.6  +0.0 375.00 4.4  11.30
 4040 +13.3 4.3  96 100    00   +12.4   84.8 +16.6  +0.2 375.00 4.4  10.73
 4120 +17.7 4.3  97 100    00   +12.5   79.5 +16.7  +0.4 375.00 4.4  10.78
 4171 +20.6 4.3  97 100    00   +12.8   82.7 +17.3  +0.4 375.00 4.3  10.93
 4203 +21.9 4.4  97 100    00   +12.9   84.9 +17.5  +0.3 375.00 4.3  10.95
 4323 +21.9 4.4  97 100    00   +13.1   88.1 +17.7  +0.1 375.00 4.4  10.96
 4317 +21.7 4.4  97 100    00   +13.2   89.1 +17.7  +0.2 375.00 4.4  10.96
 4415 +21.9 4.5  97 100    00   +13.2   89.2 +18.1  +0.3 375.00 4.4  10.99
 4456 +21.9 4.5  97 100    00   +14.5   92.4 +18.3  +0.3 375.00 4.5  11.05
 4528 +21.7 4.5  98 100    00   +14.6   94.1 +18.4  -0.3 375.00 4.5  11.06
 4585 +22.1 4.5  98 100    00   +14.8   96.8 +18.9  +0.3 375.00 4.5  10.96
 4701 +21.9 4.6  98 100    00   +15.0   94.7 +19.0  +0.0 375.00 4.5  10.83
 4741 +21.7 4.6  97 100    00   +15.1  ---.- +19.2  -0.3 375.00 4.6  10.81
 4761 +21.7 4.5  97 100    00   +15.3  ---.- +19.5  -0.8 375.00 4.5  10.86
 4823 +21.4 4.6  98 100    00   +15.3  ---.- +19.5  -0.6 375.00 4.5  10.93
 4901 +21.9 4.6  97 100    00   +15.3  ---.- +19.5  -1.5 375.00 4.5  10.96
 4880 +21.7 4.6  97 100    00   +15.2  ---.- +19.5  -2.6 375.00 4.5  11.01
 5073 +21.2 4.6  97 100    00   +15.4   96.8 +19.5  -2.6 375.00 4.5  11.05
 5120 +20.8 4.6  97 100    00   +16.4  ---.- +19.7  -2.6 375.00 4.4  11.17
 5096 +20.2 4.6  97 100    00   +16.8   99.7 +19.9  -2.6 375.00 4.5  11.45
 5249 +20.0 4.6  97  90    00   +16.7  ---.- +20.7  -2.6 375.00 4.5  12.00
 5316 +20.0 4.6  97  90    00   +16.7   98.5 +20.6  -2.6 375.00 4.5  13.31
 5175 +19.6 4.6  98 100    00   +16.7  ---.- +20.8  -1.7 375.00 4.5  17.72
 5411 +19.3 4.6  98  90    00   +16.9   97.9 +21.2  -2.4 375.00 4.5  >25:1
 5350 +19.1 4.7  97  90    00   +17.0  ---.- +21.4  -2.2 375.00 4.5  >25:1
 5411 +18.5 4.7  98  90    00   +17.1  ---.- +21.5  -2.3 375.00 4.5  >25:1
 5437 +17.9 4.7  97  90    00   +17.2  ---.- +21.7  -1.8 375.00 4.5  >25:1
 5428 +17.5 4.6  98  80    00   +17.3  ---.- +21.9  -1.6 375.00 4.6  >25:1
 5602 +17.7 4.6  98  90    00   +17.6  ---.- +22.2  -1.9 375.00 4.6  >25:1
 5668 +17.7 4.7  97  90    00   +17.6  100.0 +22.2  -1.7 375.00 4.6  >25:1
 5630 +17.9 4.7  98  90    00   +17.6  ---.- +22.2  -1.9 375.00 4.5  >25:1
 5678 +17.9 4.6  98  90    00   +17.6  ---.- +22.5  -1.6 375.00 4.5  >25:1
 5767 +17.0 4.6  98  80    00   +17.6  ---.- +22.6  -1.5 375.00 4.6  >25:1
 5737 +16.6 4.7  98  80    00   +17.9  ---.- +22.6  -1.5 375.00 4.6  >25:1
 5787 +16.2 4.7  98  80    00   +18.3  ---.- +22.5  -1.5 375.00 4.6  >25:1
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Last edited by bustaman; 04-13-2006 at 08:18 PM.
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Old 04-17-2006, 01:31 PM   #2
meld
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I know your o2 is bad, that happened to mine too, I replaced it and everything went back to normal.
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Old 04-17-2006, 02:03 PM   #3
Freon
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Yes, the WB isn't reporting correctly, but you probably are running somewhat lean since your injectors are maxed, hardcore. You're maxing at MAF 4.5V and running up to 4.7v! Yikes!
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Old 04-17-2006, 08:44 PM   #4
Peeblesmx445
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Quote:
Originally Posted by Freon
Yes, the WB isn't reporting correctly, but you probably are running somewhat lean since your injectors are maxed, hardcore. You're maxing at MAF 4.5V and running up to 4.7v! Yikes!
I believe the STI MAF's go up to 5.0 Volts
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Old 04-18-2006, 12:34 PM   #5
SBW
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both my wb02 sensors that I've had both give insane readings like that when they go bad, so I believe its the sensor now and not the tuner itself. but either way, thats what they do when they seem to finally go. any race gas through yours?

sucks I know!
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Old 04-18-2006, 08:29 PM   #6
bustaman
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at the time of that log, i had about 7 gal of 100 oct mixed with under 1/4 tank of 93 octane. i ordered a new sensor... so when it comes and i put it in we shall see what happens to the logs... thanks for the help though!
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Old 04-19-2006, 03:04 AM   #7
WRX-Blue-Mica
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I feel that my WB sensor also read leaner than usual ...
So is it true if the sensor going bad it will read leaner and leaner than it suppose to be?
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