89 Grand Marquis 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 thin the engine out and can moreover allow the engine to rev occurring when not desired causing scratchy running. As its a mechanical oddity it tends not to turn upon the deformity roomy and you can sometimes listen a hissing noise taking into account the engine running.

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Might also be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can pull off a quick aberration locate if you unplug the meter and manage the engine without it. if the engine condition is the same after that chances are the meter or the association to it is faulty. Its also worth cleaning the MAF sensor wires, as they can get coated in imitation of dirt over epoch which later offsets the reading. Use some retrieve cleaner or brake cleaner to spray can onto the wires to cut off the dirt upon no account lie alongside the wires subsequently everything as they are entirely fragile

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