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Thread: Fuel injection issue

  1. #1

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    07-24-2014
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    South Carolina
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    1990 Mitsubishi Mighty Max
    Engine

    4G64

    Fuel injection issue

    1990 MM 4G64 with 225,000 miles. I am chasing a rough idle and poor drivability. Pulled all four injectors and sent them off to be cleaned and flow tested. Before and after the cleaning, the number four injector was not flowing. I placed all four injectors in plastic bottles and cranked the engine. 1,2,3 were all equal but 4 was dry.

    at this point im concerned about a wiring harness issue. What should i do?

  2. #2

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    08-11-2012
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    Richmond, CA
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    1989 Mitsubishi Mighty Max
    Engine

    G63B
    As always with the early 2.4s, has the ECU been rebuilt?
    I can help get your truck to pass California smog! PM me.
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  3. #3

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    07-24-2014
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    South Carolina
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    1990 Mitsubishi Mighty Max
    Engine

    4G64
    yes, i looked and it has a sticker from a rebuilder in Florida on it

  4. #4

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    Richmond, CA
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    1989 Mitsubishi Mighty Max
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    G63B
    Did you switch injectors around to rule out the #4 injector itself being bad?
    I can help get your truck to pass California smog! PM me.
    California BAR Smog Inspector License #EO635469
    "Keep 'em on the road."

    See what I have for sale:
    http://stores.ebay.com/zims

  5. #5


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    Columbus, OH
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    1992 Mitsubishi Mighty Max
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    Other
    The wiring harness has a connector in the engine bay on the firewall Passenger side, near the top. Get a meter and Ohm it out to #4. only 2 wires.

    http://www.mmeierle.com/MPI24LCircuit-1.jpeg

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