Re: MAFT Gen 2 - Anyone?
There could be a couple things happening.
The PCV system changes flow depending on vacuum, so there could be issues with air bypassing the MAF by going thru the PCV system. This would reduce the airflow signal and might put the ECU into decel enleanment.
Your bypass valve might be leaking, causing turbulence at that throttle opening.
At certain throttle openings, the airflow thru the MAF is most likely not uniform, as the throttle blade is mostly closed, and is 'sipping' air around the edges. This will cause the MAF to read lean.
Blow thru systems tend to take more tuning as the turbulence can be unpredictable.
Once you can log, we can tune this out.
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