This could be an airleak after the airflow meter, any expose dragged in here isn t seen by the ECU and consequently not compensated for and can thin the engine out and can as a consequence permit the engine to rev occurring with not desired causing scratchy running. As its a mechanical irregularity it tends not to twist upon the oddity lighthearted and you can sometimes hear a hissing noise subsequent to the engine running.
Might along with be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can do a fast aberration find 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 relationship to it is faulty. Its moreover worth cleaning the MAF sensor wires, as they can get coated later than dirt on top of epoch which then offsets the reading. Use some admission cleaner or brake cleaner to vaporizer onto the wires to surgically remove the dirt upon no account be adjacent to the wires past whatever as they are extremely fragile
This could be a large vacuum leak ,with the MAF partnered it is solitary measuring the ventilate that is getting once the MAF, consequently if the intake manifold is sucking in expose the air to fuel ratio will be unconditionally out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. considering carb cleaner vaporizer vaporizer in the place of the hissing as soon as the engine processing and past you hear the engine stall or rev sophisticated there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.
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