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Thread: Whats this piece

  1. #1

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    05-19-2016
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    grand cane, la
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    1988 Mitsubishi Mighty Max
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    G54B

    Whats this piece

    Wondering what this piece is and what needs to be hooked up to it. The truck had been running good but started a problem again. Seems like a vaccumm leak because the truck will idle good with the choke on and as soon as push the choke in, it wants to die. If i give it gas itll rev back up and then die. If i barely press the gas in, i can hear a hissing noise and itll die.
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  2. #2

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    Adelaide, South Australia
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    1985 Mitsubishi L200
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    That is a thermal vacuum switch. It's screwed into the base of the coolant journal and has no actual manifold vacuum in it. A vac hose goes in one way on a barb and then goes back out to whatever control circuit it's connected to. If you've got a vacuum leak it'll be somewhere else.

  3. #3



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    Yeah that sounds like a lean condition. Could be vacuum leak or the MCA jet valves.
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  4. #4

    Array
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    05-19-2016
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    grand cane, la
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    1988 Mitsubishi Mighty Max
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    G54B
    Ok, thanks. I turned the idler screw in on the carb and that helped a lot. Ill chase it down eventually

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