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06-06-2007, 01:06 AM | #1 |
Scooby Specialist
Member#: 98645
Join Date: Oct 2005
Chapter/Region:
NESIC
Location: Lawrence,ma
Vehicle:2002 WRX Wagon PSM |
low boost, running lean
noticed while tooling around the other day, that my A/F had gone leaner than normal (as observed by LC-1+gauge). I took some logs tonight and saw that my boost is lower than normal (normally 18.2, most seen is 16.8)My normal full load AFR is between 11.3 and 11.5. I'm getting a consistent 11.9-12.0. My fuel trims are +/- 3-4% also. I figured a possible intake/boost leak, but my fuel trims would look all weird. And I would figure an exhaust leak would make my LC-1 read rich as exhaust gas escapes. Any insight?
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06-06-2007, 01:14 AM | #2 |
Scooby Specialist
Member#: 34860
Join Date: Apr 2003
Chapter/Region:
Tri-State
Location: NY
Vehicle:2005 Forester CGM |
Boost leak = less boost = less load = leaner afrs if the particular load site you're hitting with lower boost calls for leaner afrs.
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06-06-2007, 09:01 AM | #3 |
Scooby Specialist
Member#: 98645
Join Date: Oct 2005
Chapter/Region:
NESIC
Location: Lawrence,ma
Vehicle:2002 WRX Wagon PSM |
thats the thing, i checked the load sites, and the AFR isn't much leaner than my full load AFRs.
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06-06-2007, 10:39 PM | #4 |
Scooby Specialist
Member#: 44422
Join Date: Sep 2003
Chapter/Region:
SWIC
Location: Gilbert, AZ
Vehicle:2009 G8 GT Cammed, sprayed, stalled |
Your boost may be lower simply from the warmer weather. Perhaps your AFR being off is simply due to a change in fuel? More ethanol content? Just throwing out ideas.
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06-06-2007, 11:29 PM | #5 |
Scooby Guru
Member#: 60324
Join Date: Apr 2004
Location: soon to be somewhere else
Vehicle:1998 RS |
are you hitting differnet load cels? differnet MAFv?
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