Quote:
Originally Posted by boostm3
Wouldnt air escaping from a crack in the charge pipe normally trigger a CEL?
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A good way to test for this is to monitor LTFT (long term fuel trim). If the MAF is metering a certain amount of air, and some of it is leaking down line, the ECU will need to compensate by removing fuel since you'll be running rich. The LTFT will have a very large percentage increase, and if high enough could throw a CEL.
At least thats how it worked on my Mazda. Normal LTFT's on that car were +/-5%. Anything above 10% usually meant small leak. 20% or higher meant significant leak (usually shitty clamp job when changing intake, IC, etc...).