454/425hp carb misfire problem
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454/425hp carb misfire problem

  1. #1
    Junior Member
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    Unhappy 454/425hp carb misfire problem

    have 1990 Baja 37' withtwin 454/425hp carbureted, one of this have misfire at high rpm 4200 and up, I installed a new ignition coil but I still have the same problem

    Thanks for your help
    Dan

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  3. #2
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    Default misfire

    Did you look at your valve springs? May not necessarily be broken, but they could be weak due to age and fatigue. Just a thought.
    Darin
    Margaret Thatcher once said The trouble with socialism is that eventually you run out of other people's money.

  4. #3
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    the problem has to start when I was using the power trim high speed, I had a problem on groung of my battery, I repair this problem, but now I have the same problem without using the power trim at high speed, I thought that the ignition coil had been damaged because of my gound problem on the battery, I change it for a new coil without good result, I was not made to check my valve springs because I thought rather a electric problem, but if I can find no other solution I will check the valve springs but for that I will have to remove the engines!

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  6. #4
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    Just me but I think your cam is going bad

  7. #5
    rollin on the river DAVEO's Avatar
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    Change your distributer cap. I had the same issue changed plugs wires rotor and cap found 1 inch crack from over tightening.
    Alcohol free since 8/8/1993
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  8. #6
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    Default

    pull your distributor out push the shaft and gear up check for play or wear at top of shaft this can create a high speed miss

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