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  1. #1
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    2011 f150 5.0 misfire 7-8

    Be replaced all my spark plugs. Did compression test. Swapped coil packs. Replaced injectors on 5,6,7,8 still missfiring and doesn't idle right. Any help would be appreciated.

  2. #2
    Chief Moderator Jersey_Joe's Avatar
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    Throwin a code?

    lit up by F150leds.com & 5Star tuned....

  3. #3
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    P0430- catalyst system efficiency below threshold bank 2
    P0161-O2 sensor heater circuit bank 2
    P0307- cylinder 7 misfire
    P0308-cylinder 8 misfire
    P0300- multiple misfires

  4. #4
    Chief Moderator Jersey_Joe's Avatar
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    Quote Originally Posted by stopher View Post
    P0430- catalyst system efficiency below threshold bank 2 P0161-O2 sensor heater circuit bank 2 P0307- cylinder 7 misfire P0308-cylinder 8 misfire P0300- multiple misfires
    Do u have water in your gas?

    lit up by F150leds.com & 5Star tuned....

  5. #5
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    It could be but why only those two cylinders. I put heet in it in case.

  6. #6
    Chief Moderator Jersey_Joe's Avatar
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    My last 5.4 had a moisture problem. I now have a 5.o. And I have not experienced this problem.

    lit up by F150leds.com & 5Star tuned....

  7. #7
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    cumbersome101
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    That's the bad two cylinders... How's the compression read? Did U do a leak down? When u pulled the plugs were they wet? Gas? Coolant? Lean crispy? as I like to say.
    It could be a crankshaft position sensor maybe... U likely. Just remember fuel, air, spark. Verify those. Compression seems to help too.
    5.0 are great engines. I am sure it's fine. Double check and triple check your work


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