Thread: Hesitation at low RPM

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  1. #1 Hesitation at low RPM 
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    So I had an issue before with the car hesitating while accelerating, I replaced the plugs and wires and everything was fine for a while. Now the car hesitates only when in lower RPM's usually between 40 and 80 MPH (1800-2800RPM). I'm not sure what it could be but I have a few ideas. First the Mass Airflow sensor is used from a junkyard according to the previous owner, so it's quite possible that is the culprit. Second is the MAP sensor, I noticed that the clip holding the sensor is broken and the sensor itself is cracked. Along with that I saw some oil pooled on the back of the lower intake manifold. It seemed to be leaking from the intake manifold or valve cover. Do you think this would cause a bad enough vaccum leak to make the car hesitate? Third, a check engine light came on for the (vapor canister). I don't think this would cause a problem but I'm planning on replacing it anyway. Anyone know a way to test the MAP and Mass airflow sensors?
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  2. #2 Re: Hesitation at low RPM 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    A live data scanner could lead you to a vacuum leak of if the MAP sensor is reading incorrectly.

    I'd clean the MAF sensor just because though.

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