|
|
|
|
Thread Tools | Display Modes |
11-20-2007, 12:33 AM | #1 |
Scooby Specialist
Member#: 2539
Join Date: Oct 2000
Location: Snohomish, WA, USA
|
Low RPM/low boost knocking?
Evening all.
Trying to tune some mid-RPM (3250-4500) knock out of my car in the 90-100 load points and ran across some VERY bizarre knocks. Very light throttle (11-12%), very low boost (-6)... Code:
***91;TSMP***93;***91;RPM***93;***91;PSIG***93;***91;MAF***93;***91;TPS***93;***91;LOD***93;***91;KN***93;***91;SNB***93;***91;SIG***93;***91;IDC%***93;***91;IGN***93;***91;FMVL***93;***91;BMV***93;***91;MMV***93;***91;WBO2***93; 985.47 1803 -9.8 1.9 8 0 0 14.3 34.2 4.8 ECU +1.0 ECU 1.9 19.87 985.67 1840 -9.1 1.9 8 0 0 14.0 35.3 4.5 ECU +1.0 ECU 1.8 14.42 985.87 1839 -8.9 1.9 8 0 0 14.5 35.0 4.8 ECU +1.0 ECU 1.9 14.63 986.07 1843 -8.7 1.9 10 0 0 14.5 34.9 5.0 ECU +1.0 ECU 1.9 15.02 986.27 1835 -8.5 1.9 10 0 0 14.3 35.1 5.2 ECU +1.1 ECU 2.0 14.61 986.47 1842 -7.9 2.0 11 0 0 14.3 35.4 7.2 ECU +1.0 ECU 2.1 14.05 986.67 1841 -6.3 2.0 11 0 1 13.6 37.4 6.8 ECU +1.0 ECU 2.1 13.63 986.87 1838 -5.9 2.1 11 0 0 14.0 37.6 7.0 ECU +1.0 ECU 2.1 13.53 987.34 1868 -5.7 2.1 12 0 2 14.3 35.6 6.9 ECU +1.0 ECU 2.1 14.38 Code:
***91;TSMP***93;***91;RPM***93;***91;PSIG***93;***91;MAF***93;***91;TPS***93;***91;LOD***93;***91;KN***93;***91;SNB***93;***91;SIG***93;***91;IDC%***93;***91;IGN***93;***91;FMVL***93;***91;BMV***93;***91;MMV***93;***91;WBO2***93; 995.63 1872 -3.0 2.3 20 0 0 14.3 30.9 9.6 ECU +1.0 155 2.2 14.28 995.84 1885 -2.8 2.3 20 0 0 14.3 26.9 9.4 ECU +1.0 155 2.3 14.16 996.04 1871 -2.8 2.3 20 0 0 14.3 26.2 9.4 ECU +1.0 155 2.2 14.11 996.23 1866 -2.6 2.4 20 0 0 14.3 26.8 9.3 ECU +1.0 155 2.3 14.15 996.43 1888 -2.6 2.3 20 0 0 14.3 25.9 9.7 ECU +1.0 155 2.3 14.18 996.64 1888 -2.4 2.3 18 0 0 14.3 25.6 9.6 ECU +1.0 ECU 2.3 14.16 996.84 1910 -2.8 2.3 16 0 0 14.3 26.0 9.5 ECU +1.0 ECU 2.3 14.19 997.03 1899 -3.6 2.1 12 0 1 14.3 27.7 8.9 ECU +1.0 ECU 2.2 14.26 997.23 1941 -4.7 2.1 12 0 1 14.5 31.3 7.8 ECU +1.0 ECU 2.1 14.42 Code:
***91;TSMP***93;***91;RPM***93;***91;PSIG***93;***91;MAF***93;***91;TPS***93;***91;LOD***93;***91;KN***93;***91;SNB***93;***91;SIG***93;***91;IDC%***93;***91;IGN***93;***91;FMVL***93;***91;BMV***93;***91;MMV***93;***91;WBO2***93; 998.23 1948 -5.3 2.1 12 0 0 14.3 32.6 7.8 ECU +1.0 ECU 2.2 14.44 998.43 1956 -5.3 2.1 12 0 0 14.3 30.6 7.8 ECU +1.0 ECU 2.2 14.41 998.63 1968 -5.3 2.1 12 0 0 14.5 30.7 7.8 ECU +1.1 ECU 2.1 14.33 998.83 1979 -5.3 2.2 13 0 0 14.3 30.8 7.8 ECU +1.0 ECU 2.2 14.30 999.02 1974 -5.5 2.1 12 0 0 14.3 30.8 7.6 ECU +1.0 ECU 2.2 14.36 999.22 1991 -5.5 2.1 12 0 0 14.5 30.9 7.5 ECU +1.0 ECU 2.1 14.50 999.42 1997 -5.5 2.1 12 0 0 14.5 30.8 7.8 ECU +1.0 ECU 2.2 14.56 999.62 2006 -5.3 2.2 13 0 1 14.3 28.9 7.8 ECU +1.0 ECU 2.2 14.44 999.84 1988 -5.5 2.1 12 0 1 14.3 28.9 7.6 ECU +1.0 ECU 2.2 14.27 Code:
***91;TSMP***93;***91;RPM***93;***91;PSIG***93;***91;MAF***93;***91;TPS***93;***91;LOD***93;***91;KN***93;***91;SNB***93;***91;SIG***93;***91;IDC%***93;***91;IGN***93;***91;FMVL***93;***91;BMV***93;***91;MMV***93;***91;WBO2***93; 208.27 2766 -1.6 2.8 23 0 1 14.3 34.6 16.1 ECU +1.4 170 2.8 13.94 208.48 2794 -2.0 2.8 23 0 1 14.0 34.7 16.3 ECU +1.4 170 2.8 14.04 208.68 2866 -1.8 2.8 23 0 0 14.3 35.1 16.4 ECU +1.4 170 2.7 14.10 208.87 2888 -2.0 2.8 23 0 0 14.3 34.8 17.1 ECU +1.4 165 2.8 14.08 209.06 2908 -1.8 2.8 23 0 1 14.3 35.2 17.4 ECU +1.4 165 2.8 14.05 209.27 2952 -1.8 2.8 23 0 1 14.3 36.0 17.2 ECU +1.4 170 2.8 14.08 209.47 3005 -2.0 2.8 23 0 1 14.3 35.9 17.5 ECU +1.4 165 2.8 14.09 209.66 3016 -2.0 2.8 23 0 1 14.3 36.4 17.5 ECU +1.4 165 2.8 14.07 209.87 3058 -2.2 2.8 22 0 1 14.3 36.6 17.7 ECU +1.4 160 2.8 14.07 First time I've ever seen anything like this. I hadn't driven the car for about a week before yesterday. I threw on my snow tires, warmed it up, and drove about 10 miles yesterday. I drove it to work this morning (about 10 miles), after work I went to the neighboring town about 20 miles away, shut it off for about 35 minutes and then the problem started. I'm staying below the crossover so I think the UTEC's just reporting the knocks. I had it tuned in April and, aside from my mid-range knock I haven't really had any issues with the tune. Any ideas? Thanks! FFb
* Registered users of the site do not see these ads.
|
11-20-2007, 03:56 AM | #2 |
Scooby Newbie
Member#: 37938
Join Date: Jun 2003
Location: Indonesia
Vehicle:02 WRX Blue Mica |
It is quite strange because your car was knocking when the STock ECU still in control according to UTEC. Your boost still negative ... r u sure nothing making any noise under the hood?
Maybe for the temporary solution you can tune the 0% column timing (reduce the timing). just my 2 cnt |
11-20-2007, 06:43 AM | #3 |
Scooby Specialist
Member#: 14141
Join Date: Jan 2002
Location: [email protected] @ 5800 ft on 13T
Vehicle:2002 Impreza WRX |
I doubt that is real knock, probably some other cause like a loose heat shield etc.
You can't have detonation when the engine is not under load, unless the tune is totally in the wrong time zone so baddly it would instantly kill the engine under boost. Larry |
11-20-2007, 07:24 AM | #4 |
Scooby Specialist
Member#: 123574
Join Date: Aug 2006
Vehicle:2005 STi CGM |
+1 for Larry's idea. I've been fighting the same problem, and have yet to discover the cause. I have noticed that my engine seems to do this more when it's a bit low on oil.
|
11-20-2007, 09:15 AM | #5 | |||
Scooby Specialist
Member#: 2539
Join Date: Oct 2000
Location: Snohomish, WA, USA
|
Quote:
Quote:
Quote:
Anyone have any idea what things to check under the hood? I'll need to drive with the window down when pulling away from stop signs/lights to tell if I can hear it at all. If I could hear it all the time (even if it's only causing knock some of the time) that'd sure be helpful for tracking it down. Heck, I don't have anything else to listen to while I'm driving (friggin' Infinity crap ). |
|||
11-20-2007, 09:50 AM | #6 | |
Scooby Specialist
Member#: 14141
Join Date: Jan 2002
Location: [email protected] @ 5800 ft on 13T
Vehicle:2002 Impreza WRX |
Quote:
Try finding a location like a narrow alley where you can drive with your window down right next to a concrete or brick wall. It makes it very easy to hear noises that are impossible to hear effectively inside the car. Larry |
|
11-20-2007, 11:42 AM | #7 | |
Scooby Specialist
Member#: 2539
Join Date: Oct 2000
Location: Snohomish, WA, USA
|
Quote:
Thanks for all the help, guys! I'll report back... |
|
11-22-2007, 10:53 AM | #8 |
Scooby Specialist
Member#: 2539
Join Date: Oct 2000
Location: Snohomish, WA, USA
|
Last night when I was running some errands I noticed the knocking at various RPMs, still with no positive boost. It got me thinking, I checked my plugs about 3 weeks ago and a 12mm socket fell down on the passenger side of the engine compartment. It went down near the coils, and after spending about 30 minutes looking for it (rock guard, exhaust shields, etc) I gave up. I had summarily forgotten about it, but I thought about it again yesterday as a good candidate for causing the knock. Hopefully tomorrow I'll have some time to crawl under the car and see if I can track that down.
|
11-22-2007, 10:59 AM | #9 |
Scooby Specialist
Member#: 123574
Join Date: Aug 2006
Vehicle:2005 STi CGM |
^^^
If that works, I will blame mine on one or both of the 8mm sockets that my engine bay ate during a turbo swap. |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
strange noise - low RPM/low speed | Nick02 | Newbies & FAQs | 5 | 07-08-2008 09:38 PM |
Low rpm knock? | NJ2.5RS | Open Source Reflashes | 4 | 01-27-2008 09:05 AM |
Low RPM Low Load Issue | xolosis | Commercial ECU Reflashes | 1 | 11-01-2006 12:52 PM |
Knock at low rpm and throttle | PharmCo | Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) | 4 | 02-02-2004 10:28 PM |
Flashing CEL at mid-low RPMS / low Throttle - then gone | johnnytran | Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) | 0 | 06-06-2003 03:45 AM |