Need some diagnosis/ help
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Need some diagnosis/ help

  1. #1
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    Default Need some diagnosis/ help

    1
    Last edited by 79miller; 08-14-2010 at 10:06 PM.
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  3. #2
    I'm famous ! Lucky's Avatar
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    if your engine is warm and has expanded , their would be more pressure on your gaskets . a bad head gasket will show up regaurdless with a compression test - or water dribbling down your block someplace ..

    cylinders with in 10% on the compression test , numbers sound good


    How much water in your fuel sep ?

    may have some bad fuel causing rough idol
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    Last edited by Lucky; 08-13-2010 at 04:30 PM.
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  4. #3
    oldsmopile equipped
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    Default fuel tank

    is your fuel tank venting properly?
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  6. #4
    oldsmopile equipped
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    if the tank(s) are not venting that could be why your getting higher temps than normal, the carb could be leaning out.
    also if it runs fine for a bit then bad, if you shut it off and restart it and it runs good again,it sounds like your vent is plugged up.
    my 2 cents.
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  7. #5
    Senior Member jetboatperformance's Avatar
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    Honesltly the "running rough" vs "but not missing" is confusing ??(if I read correctly) , your compression is fairly even and the 10lbs variation is not bad , considering the engine is running warmer than normal lastly the feeling its just not right . What I supsect you may be feeling might be a impeller "shuddering"(not so much engine missing") I'd personally inspect the jet more and closer , if it (the jet) aspirated something (rope, trashbag, panties etc) it could be wrapped up on the exit side of the impeller (you can't see) , this will could make the jet shudder like a dog "passing" Peach pits , would have loss of power and also maybe explain the "running warmer" Just something to check ... Tom
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