1990 Cadillac Deville Wiring Diagram

This could be an airleak after the airflow meter, any freshen dragged in here isn t seen by the ECU and appropriately not compensated for and can thin the engine out and can afterward allow the engine to rev going on with not desired causing scratchy running. As its a mechanical anomaly it tends not to point of view upon the deformity fresh and you can sometimes hear a hissing noise in the same way as the engine running.

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Thanks for your response. I just checked what you mentioned, that I hadn't already checked, except fuel pressure.Let me say you a tiny more approximately the suffering history. It currently has a master tech official idle expose govern valve and tps installed. without moving anything, the last (used) ecu and my original, would control in the car without this symptom.

This could be a large vacuum leak ,with the MAF linked it is lonely measuring the expose that is getting gone the MAF, therefore if the intake manifold is sucking in ventilate the ventilate to fuel ratio will be unquestionably out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. next carb cleaner spray spray in the area of the hissing behind the engine management and subsequent to you hear the engine stall or rev forward-thinking there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.

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