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11-15-2012, 12:23 PM | #1 |
Scooby Specialist
Member#: 311781
Join Date: Feb 2012
Location: Canada
Vehicle:2003 WRX w STI V8 |
Can't tune out a lean spot.
So story goes like this. Car was fine (so to speak) and I had my clutch go out on me. I replaced the clutch and put everything back together. Now I have a lean spot in my tune that I can't get rid off. I though alright, I might have a leak.
Got my TMIC tested and my BOV was leaking. So I lapped the piston and put a new O-Ring and retested. Its seals perfectly now. I also added 2 more washers to make it stiffer. I then tested my motor. No leaks there either. I have looked at the tune a million times and there is nothing that shows it should lean out. If it makes any sense my A/F correction drops to zero when it leans out. Maybe the BOV is opening at partial throttle and letting a small amount of air out? though that would make the tune richer as metered air is escaping. Any ideas would be nice. Thanks!
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11-15-2012, 01:55 PM | #2 |
Scooby Specialist
Member#: 159743
Join Date: Sep 2007
Location: Plymouth Ma
Vehicle:07 STI Limited TurboMike Tuned 2.35 |
can you pm me and send the rom over? it always helps to have two sets of eyes. :-)
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11-15-2012, 03:46 PM | #3 |
Scooby Specialist
Member#: 48943
Join Date: Nov 2003
Chapter/Region:
MAIC
Location: NoVA
Vehicle:2004 95%*STi Blu/Gld www.dcawd.com |
Check your MAF, might need a little cleaning. Also, copy your MAF scaling and check for any odd spots. You might just be noticing the lean condition now, but it might have existed for a long time. How lean are you getting?
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11-15-2012, 05:05 PM | #4 |
Scooby Specialist
Member#: 311781
Join Date: Feb 2012
Location: Canada
Vehicle:2003 WRX w STI V8 |
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11-15-2012, 05:06 PM | #5 |
Scooby Specialist
Member#: 311781
Join Date: Feb 2012
Location: Canada
Vehicle:2003 WRX w STI V8 |
Stock MAF table. MAF was recently cleaned.
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11-15-2012, 06:23 PM | #6 |
Scooby Specialist
Member#: 48943
Join Date: Nov 2003
Chapter/Region:
MAIC
Location: NoVA
Vehicle:2004 95%*STi Blu/Gld www.dcawd.com |
Stock intake then?
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11-15-2012, 07:19 PM | #7 |
Scooby Specialist
Member#: 311781
Join Date: Feb 2012
Location: Canada
Vehicle:2003 WRX w STI V8 |
Last edited by OC_Nooby; 11-16-2012 at 12:08 AM. |
11-16-2012, 05:11 PM | #8 |
Scooby Specialist
Member#: 311781
Join Date: Feb 2012
Location: Canada
Vehicle:2003 WRX w STI V8 |
Well the lean spot is gone. Not sure if it was my fuelling map tune or the engine compensation map tune I started working on. It's gone none the less.
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11-28-2012, 11:59 PM | #9 |
Scooby Newbie
Member#: 151260
Join Date: Jun 2007
Chapter/Region:
SCIC
Location: San Diego, CA
Vehicle:2011 BMW 135i __________ |
Did you disconnect the battery when you replaced the clutch?
This may sounds dumb, but maybe your ECU just relearned the proper correction after it was reset when you repaced that clutch? I am kind of curious just as a fmi, and I like threads with conclusive answers.... |
12-04-2012, 11:12 AM | #10 | |
Scooby Specialist
Member#: 311781
Join Date: Feb 2012
Location: Canada
Vehicle:2003 WRX w STI V8 |
Quote:
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12-04-2012, 01:48 PM | #11 |
Scooby Newbie
Member#: 283968
Join Date: May 2011
Chapter/Region:
MWSOC
Location: Fort Wayne, IN
Vehicle:2003 WRX MBP |
fwiw, the only thing the ECU "learns" are long term fuel trims, and knock correction
both of which if tuned properly, should not be affecting the engine |
12-10-2012, 03:24 AM | #12 |
Scooby Guru
Member#: 140444
Join Date: Feb 2007
Chapter/Region:
NWIC
Location: Near Seattle, WA
Vehicle:05 Stage Free LGT ATP 3076, 6MT, AVO FMIC |
VTA BOV?
If yes, the it may be opening intermittently in vacuum. Stiffer springs or moar shimz should help. |
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