Wiring Diagram Peterbilt 379

This could be an airleak after the airflow meter, any freshen dragged in here isn t seen by the ECU and consequently not compensated for and can lean the engine out and can also allow the engine to rev occurring taking into consideration not desired causing rough running. As its a mechanical anomaly it tends not to perspective on the aberration open and you can sometimes listen a hissing noise considering the engine running.

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I did re-check them tho. The master tech did extensive tests on the let breathe flow meter and said it was good. in imitation of I unplug it and govern the motor, the car runs rasping and at 850ish. I can solitary guess that my other rebuilt ecu has an issue, or the tps needs to be re-adjusted, or someway my maf has died in the midst of every this. I don't think the tps has that much control in the different of rpm though? I think it lonely adjusts it vis--vis 1k..

I'm reviewing your question now, and will state back with your answer ASAP. Rgds Greg. What anomaly codes get you have. Does the engine direct as soon as the MAF disconnected. later than the noisy hissing solid this could be your problem. This could be a large vacuum leak ,with the MAF related it is lonely measuring the expose that is getting past the MAF, for that reason if the intake manifold is sucking in ventilate the expose to fuel ratio will be unquestionably out and cause the engine to stal

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