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Thread: Pulsing on startup

  1. #1

    Array
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    Join Date
    07-08-2019
    Posts
    12
    Location

    Denver, CO
    Vehicle

    1987 Mitsubishi Pajero
    Engine

    4G64

    Pulsing on startup

    1985 MM 2.6L 5 Spd, all stock. I've got what might be an unusual issue. When I start the truck up in the morning (usually cold out) it will fire up and then start pulsing until it gets warm. What's unusual is sometimes I can hear it run fine for one second after it starts and then it does the pulsing until it's warm. In the afternoon, I don't usually have the same issue. Am I incorrect in thinking there's a temperature sensor somewhere that could be contributing to this? Or is it perhaps a sticky choke? I believe I'm selling this one soon and I'd like to get it all fixed up.

  2. #2

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    06-15-2014
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    6,059
    Location

    Adelaide, South Australia
    Vehicle

    1985 Mitsubishi L200
    Engine

    G63B
    How frequent is the pulsing?
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  3. #3

    Array
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    07-08-2019
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    Location

    Denver, CO
    Vehicle

    1987 Mitsubishi Pajero
    Engine

    4G64
    Pretty quick, about every second.

  4. #4

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    6,059
    Location

    Adelaide, South Australia
    Vehicle

    1985 Mitsubishi L200
    Engine

    G63B
    You might have a vacuum issue somewhere, or the mixture screw is out of adjustment or a partially blocked jet. Take the air cleaner off and give it a blast of carb cleaner, start it up and try purging it. Start the engine and use your hand to starve the engine of air by covering the throats of the carb and revving the engine. Don't use a rag or something that'll obviously end up disappearing into the engine. I don't think there's a temp sensor that would affect idle (if there was one, it would either work or not). What is the idle rpm cold like? I'm kinda clutching at ideas here.
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