problem
https://ls1tech.com/forums/pcm-diagnostics-tuning/999528-maf-question.html
OBDII was the only tool that found the problem. My PCM also does not show a code (SES) when my Crank Shaft Position sensor failed or when my MAF failed. Go figure.
Any un-metered air may cause this DTC to set. Inspect for the following:
An engine vacuum leak
The PCV system for vacuum leaks
An incorrect PCV valve
The engine oil dip stick not fully seated
The engine oil fill cap loose or missing
I've read a vacuum leak will cause it to run poorly so maybe take a close look at that.Just a thought.


