Hesitation on acceleration?
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Thread: Hesitation on acceleration?

  1. #1
    FRESHMAN ROVER nazdackster's Avatar
    Join Date
    August 22nd, 2010
    Chicago Area

    Hesitation on acceleration?

    My '94 classic is giving me a hesitation when cold and accelerating, and it had a longer spell of that today. Colder makes it worse, it idles fine, it drives fine, but on acceleration it can bog like it is not getting spark, then it takes off fine. The vacuum advance works. Feels electrical. Does not ever do this unless accelerating from start. I'm at a bit of a loss at what to look for or how to test. Thanks!
    1994 County LWB, Plymouth Blue
    2002 P38 (Sold)

    2008 LR3 HSE (Sold)
    1980 Toyota FJ40
    1984 Jeep CJ-7

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  3. #2
    CSK is offline
    Join Date
    January 21st, 2010
    Dark Side Of The Moon, New Zealand

    Re: Hesitation on acceleration?

    maybe try a different ecu. i had a intermittant problem a couple years back where i could be doing 100 km/hr on the motorway when the car would just start hessitating. spent heaps trying to find the problem. a friend was doing a conversion to (dedicated) lpg so didn't need his ecu, gave me a go with his ecu and problem fixed.
    In V8 land we're better and we know it.

  4. #3
    Join Date
    July 21st, 2012

    Re: Hesitation on acceleration?

    On cold starts, regardless of temperature, mine will idle fine but stumble pretty low when I give it gas from a stop for about the first five minutes of running. I haven't looked into it much since everything runs great otherwise.

    On my VW's this kind of issue can sometimes be caused by a bad coolant temperature sensor or vacuum leak.

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  6. #4
    Join Date
    September 17th, 2004
    Melbourne Australia

    Re: Hesitation on acceleration?

    Test the throttle position sensor. It tells the motor that you just put the foot down and to add a splash of fuel to stop that hesitation when you start to accelerate.

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