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Thread: What should MAP idling?

  1. #1

    Default What should MAP idling?

    What should my MAP be on when the car idling?

    It`s stands on 16.

    The MAP goes down when I touch the gas pedal.

    Hope to get some good advices.

  2. #2

    Default What should MAP idling?

    MAP is manifold absolute pressure. At key-on, engine-off the MAP will be reading barometric pressure.

    The MAP pressure should drop with the engine idling. Subtract MAP at idle from MAP at key-on, this will be your engine vacuum.



    Assuming you are near sea level (~29.9"Hg) this would equal to about 13.9" of vacuum at idle.


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