Quote:
Originally Posted by Jfmoore79
I have been chasing some increased fuel trims happening at low to moderate RPM. Ted Jannetty has pointed me towards a vacuum/boost leak or issue with the MAF sensor. I took all the Procharger charge and intercooling pipe apart to ensure tight connection and removed and cleaned the MAF sensor. I’m going to do some logs without the front bumper in case I have to pull it all apart again so speed and gear will be low. What trim numbers should be in the normal range at idle and low rpm?
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I am always happy to answer your questions.
Fuel trims should be negative between -1-3%
We had that then all of a sudden the next log was Plus 10-15% which indicates some sort of air leak in the PCV, catch can, intake etc.
You said you found a vacuum line off but there was no difference on the next log so that indicates a bigger problem.
Ted.