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Old 05-27-2010, 02:26 AM   #7
NSFW
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

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Quote:
Originally Posted by dazedone View Post
Also check your pcv valve and system, up to 30% of engine intake air can passthrough the pcv system. If its clogged/restricted you will run rich.
Why? The PCV system pulls air from the turbo inlet (downstream of the MAF sensor), and vents that air into the intake manifold (downstream of the MAF sensor). If it's clogged, you'd just have more air going through the regular intake tract (turbo, IC, etc) and less air going through the motor, but either way the amount of air entering the cylinders should be the same as the amount of air that went past the MAF sensor.
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