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2007 Ford F-150 Question: why doe my truck have a shake to it at around 55 until the engine warms up?

 

Question

jsgodsey, 5.4L V8, Hopkinsville, KY, February 08, 2013, 10:57
 Rookie

When i get up around 55 mph my truck has a shake in the front end until the engine warms up and it seems like it misses at that speed until the engine warms up.

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  • Answer #1

    Randico February 08, 2013, 12:39
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     Enthusiast

    Misfire,When the vehcile is under load a coil demands on a sparkplug are greater so your you are looking at a misfire, you are equipt with a COP (coil on plug),Also because you are a F 150 go to the passenger side at the rear of the sparkplug area look for coolant leaking into the sparkplug chambers that also causes misfire, Above all else it is time for a tune, will it fix this you bet, unless you like going to gas station

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    jsgodsey, February 08, 2013, 12:44
     Rookie

    thanks for your quick response. What would cause coolant to leak into the spark plug chamber?

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    Randico, February 08, 2013, 13:06
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     Enthusiast

    Bad design,that my opinion,but get this check because when you get these small misfire its either coolant contamination or a sparkplug loosened in the camber ready to blow out, and the repair for a rethread on the cylinder head is one arm and one leg and one eye,

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  • Answer #2

    Greg's Orange Auto (13428 Answers) , Orange, CA - (714) 361-9386
    globalhelper February 08, 2013, 12:47
     Master

    could be serveral issues with water in plug hole,heater hose above it leaking. thats most likely why it runs rough cold. when water dries the misfire is gone. have cooling system pressure tested to determine leak and that might repair misfie also

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    jsgodsey, February 09, 2013, 13:37
     Rookie

    I take it in to the dealer Thursday to be fixed. I had the computer put on it and it shows a cylinder #4 misfire

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