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Thread: Losing throttle response intermittently

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  1. #1

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    05-03-2015
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    NC
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    1993 Mitsubishi Mighty Max
    Engine

    4G64
    Quote Originally Posted by geezer101 View Post
    Take off the rocker cover, pull the plugs and turn the crank by hand with a socket and extension bar. If you see any slack on the rockers as you turn the engine you have found your dud valve. You might have to grab the rockers and jiggle them by hand to feel for play if you can't see it. It is easy enough to do and is quick. Other options are borrow a compression tester from a friend and see what prevails and/or just look at each individual spark plug and see which one stands out from the rest.
    Thank you for the clear instruction. I will do this but it might have to wait a few days as I'm going to be visiting family. Stay tuned!

  2. #2

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    01-21-2016
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    Chaparral, New Mexico
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    1991 Mitsubishi Mighty Max
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    I.D.K.?
    Another suggestion would be to use some Carb cleaner to clean your carburetor, then raise your idle screw by just a tiny bit. Let it dry, then see what happens

  3. #3

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    1993 Mitsubishi Mighty Max
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    Quote Originally Posted by MightyMax1991 View Post
    Another suggestion would be to use some Carb cleaner to clean your carburetor, then raise your idle screw by just a tiny bit. Let it dry, then see what happens

    I'm fuel injected

  4. #4

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    1993 Mitsubishi Mighty Max
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    Waiting for some valve stem seals to arrive since I've got smoke at startup. I'll be looking for stuck valves while I install those.

    A couple weeks ago, since the weather is cooler, I was able to determine that the issue doesn't happen when the truck is at op temp. Leading me to believe a stuck valve is the case here.

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