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Thread: Cylinder leakdown test results/comments

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  1. #1



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    1979 Dodge D-50
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    White smoke = not enough heat.
    Black smoke = to much fuel.
    No smoke = no fuel
    The glow plug temp sensor or timer might be on the fritz. Thats why it cuts off to soon. It is possible that there is an air leek in the fuel system or you got a load of water. Also in cold weather you can get gelling of fuel. Is the fuel clean looking or cloudy. Cloudy is a bacteria in the fuel often reffed to as diesel fish. They can cause problems when it's bad enough.
    How long has it been loosing power? Fast or long, over time.
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  2. #2

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    1992 Mitsubishi Strada
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    4D56-T
    the loss of power symptoms came on over time.
    I've never tested the GP temp sensor but have thought of it as a possibility.

    fuel is correct color, no bacteria.
    no water
    I have put clear fuel lines in for inspection to see if I had air in the fuel. I didn't have any air before the IP, but don't recall if I had any after the injectors. would air after the injectors be a concern?
    My fuel filter pump does not stay solid if I pump it up. the pressure will drop off after a few seconds, is that normal?

  3. #3

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    1986 Mitsubishi Mighty Max
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    Quote Originally Posted by strada-caster View Post
    the loss of power symptoms came on over time.
    I've never tested the GP temp sensor but have thought of it as a possibility.

    fuel is correct color, no bacteria.
    no water
    I have put clear fuel lines in for inspection to see if I had air in the fuel. I didn't have any air before the IP, but don't recall if I had any after the injectors. would air after the injectors be a concern?
    My fuel filter pump does not stay solid if I pump it up. the pressure will drop off after a few seconds, is that normal?
    got the same situation too (we have the same motor)...priming pump does not get hard even after numerous pumps. yet it pumps fuel. when i replaced the priming pump, it will get hard after about 5 pumps on it. the return line (after the injectors) is plumbed back to the IP via a banjo bolt on the rear of the IP then goes back to the tank. previously i had a loose clamp holding the return line and the engine would cut me off on WOTs.

    hth

  4. #4

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    Quote Originally Posted by miked50 View Post
    got the same situation too (we have the same motor)...priming pump does not get hard even after numerous pumps. yet it pumps fuel. when i replaced the priming pump, it will get hard after about 5 pumps on it. the return line (after the injectors) is plumbed back to the IP via a banjo bolt on the rear of the IP then goes back to the tank. previously i had a loose clamp holding the return line and the engine would cut me off on WOTs.

    hth
    I've also been thinking the head gasket...but I have no hard evidence other than a hunch. I was hoping to find leakage between two cylinders (i never checked this while I was doing the test, i'll kick myself for being a noobie). the leakage test I performed is pointing towards the rings if anything.

    I will have to recheck my return lines..i know its not in the greatest of shape.

    the fuel primer pump: I know people have replaced them because the o-ring sealing face was rusted and letting air in the lines, or there was a crack around the inlet/outlet and letting air in, I don't see those problems with mine (and no air in the lines after the primer pump...)

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