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1996 Ford F-150 Question: what makes engine mifire at all speeds

 

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LLOYD MURRAY, 4.9L 6 Cylinder, Freedom, PA, April 11, 2011, 18:43
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engine has a slight miss every 15 seconds at idle. at all driving speeds the engine misfires badly... changed plugs and fuel filter and added lucas injector additive no help .. the plugs were light gray and burning clean .. no check engine lights ... any ideas ?

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    April 11, 2011, 19:20
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     Master

    i would continue and replace the cap, rotor and wires. cover all the basics before going somewhere else. if this does not work, get a diag from a shop with a bid.

    thanks for using repairpal.

    Roy

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    LLOYD MURRAY, April 13, 2011, 07:25
     Rookie

    Thanks Roy, I will do that .. i have dual gas tanks on truck and a co-worker had the same problem and he told me to check cat converter as switching between tanks can clog converter !! I have never heard of that .. I will change all tune up parts before I get into that..

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    mastertech6371, April 13, 2011, 14:58
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     Master

    your welcome

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  • Answer #2

    Visitor, July 29, 2011, 21:01

    if you have two tanks replace the fuel tank switch on the dash fixed mine 13.99

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