1972 Chevy Wiring Diagram

This could be an airleak after the airflow meter, any freshen dragged in here isn t seen by the ECU and thus not compensated for and can lean the engine out and can furthermore permit the engine to rev going on similar to not desired causing prickly running. As its a mechanical aberration it tends not to tilt on the irregularity well-ventilated and you can sometimes hear a hissing noise subsequent to the engine running.

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I did re-check them tho. The master tech did extensive tests upon the freshen flow meter and said it was good. following I unplug it and control the motor, the car runs coarse and at 850ish. I can lonely guess that my further rebuilt ecu has an issue, or the tps needs to be re-adjusted, or anyhow my maf has died in the midst of every this. I don't think the tps has that much manage in the interchange of rpm though? I think it unaccompanied adjusts it nearly 1k..

This could be a large vacuum leak ,with the MAF related it is abandoned measuring the air that is getting taking into account the MAF, for that reason if the intake manifold is sucking in freshen the let breathe to fuel ratio will be definitely out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. following carb cleaner vaporizer spray in the place of the hissing similar to the engine paperwork and later than you hear the engine stall or rev unconventional there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.

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