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Thread: misfire or something

  1. #1
    yes i searched.......
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    misfire or something

    drone my 03 hd to the casino tonite , ran fine, when i was leaving the casino it was stuttering and sputtering, almost like it has a bad coil pack or plug, is there any way to check the coils to see if one is bad? i am new to cop systems.

    also not throwing any codes
    Last edited by Johnny63; 02-27-2011 at 01:16 AM.

  2. #2
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    Name: Kevin

    Blind's Avatar
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    Check torque on all of the sparkplugs before you drive it again, 1 or morr is backing out.


    Sent using Tapatalk while pooping.
    2002 DSG HD #09617 NHTOC Truck of the month November 2012
    Ported eaton/plenum/tb, 6lb lower, SCT BA-2600 MAF, OBX longtubes, JLP intake, FTVB, L-spec bilsteins, Hotchkis TVS, 22" replicas. Tuned by Ray McClelland of FTK

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    ^^^^x2 Condensation in the plug whole can also do this. One thing that I have done in the past was bought a used COP that I know worked and replaced them one by one until it stopped..Basically take off old cop put on new...no fix...take that cop and put it on the next one in line because you know that one works. When was the last time that you changed plugs? what are your mods? It could be a burned up plug too...When this happend to me I found THREE burned up plugs.

  4. #4
    Man this is expensive!!!
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    2manytrucks's Avatar
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    also you can take it to Autozone and have them check to see if there are any codes. If you are lucky they can tell you which cylinder is mis-firing.

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    When my 5.4 had a miss (not a HD, sorry) it threw a code. I switched the coil to the neighboring cyl and the miss followed. I didn't wait for it to throw another code, I simply unplugged them one at a time.

  6. #6
    yes i searched.......
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    found the problem, #4 was loaded with water, read somewhere about heater lines leaking above #4, didn't find a leak though, also replaced the plugs, lucky i did, alot of them were not so tight. thanks for all the help.

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