How To: Change a C.O.P.

Discussion in 'Tech Info' started by ak_cowboy, Jun 4, 2013.

  1. TxFx04

    TxFx04 FFS Frequent Traveler

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    Not to sound stupid but how can you tell if you have a misfire? I'm at 115k miles on factory plugs.. i don't know what to feel for
     
  2. AKBray907

    AKBray907 SUPER *********.

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    It'll feel like someone is sitting in the seat behind you shaking your headrest, an sound like someone is kicking a floorboard. I'm serious
     
  3. MyFX4Project

    MyFX4Project TRUCKIT

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    Yeah basically. I drove his truck and when we were going slightly uphill at low rpm it would shake really bad. If you have a misfire, you should feel it.
     
  4. iowaredneck

    iowaredneck Administrator

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    Mine sounded like a drag car. Knew it right away

    sent from area 51
     
  5. AKBray907

    AKBray907 SUPER *********.

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    It shouldn't make it louder unless you shot a plug?
     
  6. iowaredneck

    iowaredneck Administrator

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    I didnt blow one just chugged like a drag car

    sent from area 51
     
  7. Tradesman

    Tradesman Full Access Member

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    My truck has been misfiring for about two months now with no CEL at all. To find out for sure you'd have to get a diagnostic scanner.

    Out of all 8 coils, two of them were toast. I could tell when I inspected them individually. The condition of the boots and springs were gone, and these were aftermarket coils that the previous owner had installed.
     
  8. Tradesman

    Tradesman Full Access Member

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    The whole truck will shudder during acceleration. That's what happened to me, and that's what my service advisor mentioned. I had another independent mechanic check it out and he said he can tell it was misfiring just by the way it sounded when he revved my motor. I can't tell s**t because I'm partially deaf. But a lot of owners will think it is a transmission related issue, which is what I thought it was originally.

    Yup, that's what it felt like to me. I felt like some fat chick was sitting behind me trying to nibble my ear and I had to push the b***h away.

    Some well experienced technicians can tell it is misfiring by the way it sounds during idle and during mid-RPM revs.
     
  9. Tradesman

    Tradesman Full Access Member

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    Last edited: Aug 30, 2013
  10. TxFx04

    TxFx04 FFS Frequent Traveler

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    well i can say i'm not missing or anything when driving but i can tell my plugs need to be swapped. just takes longer to crank until it turns over, doesn't sound healthy when it starts.
     

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