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Thread: Denali 6.0L P0300 Random Misfire

  1. #1
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    Default Denali 6.0L P0300 Random Misfire

    My dad had an '02 GMC Sierra Denali with 6.0 liter that has been getting a random misfire code. Sometimes it flashes the SES light while driving.
    So far the fuel and air filters and spark plugs were changed and the MAF was cleaned.
    Is there a common cause for this or is it going to be a lot of parts replacing?
    Also, it sounds like it might have a small exhaust leak. Can that possibly cause the misfire?
    2002 crew cab
    Most of the arguments to which I am party fall somewhat short of being impressive, owing to the fact that neither I nor my opponent knows what we are talking about.
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    hook up a scanner and look at misfires, should show current and history misfire... you want to look at the history #'s
    02 K2500HD 8.1/ally 4" Rancho lift w/ 35" pro comp Xtreme AT's. Soon to be EFI Live tuned


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  3. #3
    The Weekend Mechanic
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    Check all plug wires. After being replaced, or replacing plugs, they tend to pop off for the first while. Mine did for about 6 months, and has been fine since.
    Last edited by oldbrownsierra; 12-21-2009 at 09:47 AM.
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  4. #4
    Real Trucks Don't have Spark Plugs! Dad's 05 LLY's Avatar
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    I'd replace the wires. They're relatively cheap, and one more variable eliminated. Be sure you use di-electric grease on the boots. I like the Beldin Premium wires from NAPA.
    Ed
    05 CCSB LLY/Allison 4x4 LS. SuperLiner Spray-In Bedliner, Full Amsoil, Predator @ 60HP. 110,000 miles
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  5. #5
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    He took it to the dealer and they said it is the injectors. They cleaned them and said there were a couple that were still misfiring. They told told him to drive it for a while and if they don't clear up then they will have to be replaced. It has been quite a while since then so he will have to get them replaced.
    2002 crew cab
    Most of the arguments to which I am party fall somewhat short of being impressive, owing to the fact that neither I nor my opponent knows what we are talking about.
    Robert Benchley


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