GM V8 Question......

Discussion in '40- & 55-Series Tech' started by Degnol, Nov 3, 2005.

  1. Degnol

    Degnol

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    I've got a '98 Yukon with 100K. At 90K the "Check engine" light came on, it was a miss in #4. Had a tune up done, Cap rotor wires and those pricey GM Platinum or whatever plugs. It has come on 3 times since with "miss in #4",
    first time they said faulty wires and replaced them, second time faulty plug replaced it, and today cracked plug and replaced it again.
    WTF is the matter with #4 cylinder and its plug-eating problem?

    It is a Vortec and has run flawlessly, so I can't complain except for this.


    Thanks,

    ed
     
  2. Corbet

    Corbet Speski OffRoad LTD. Supporting Vendor

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    checked with my GM tech, probably a bad injector.
     
  3. Degnol

    Degnol

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    So, that would cause 4 plugs to fail? Hmmmmm. Does it ever make sense to replace just one injector?

    Thanks for the reply.

    Ed
     
  4. Gumby

    Gumby Supamod Staff Member s-Moderator

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    Could cause a lean condition that would wreck the plug. Vortecs are notorious for plugging injectors.

    Who is they who are doing the work?
     
  5. Degnol

    Degnol

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    Glad you chimed in here Gumby, I was reluctant to put your name in the post, but I did want your input. To answer your question, just a bunch of local savvy guys with the OBD? stuff to read codes. 1500 misfires. Only felt it today when it was a dead miss. What do you think about replacing the one injector? I routinely run SeaFoam through all my stuff, injected or carbed, so I don't think it is dirt.
    Seems to me that it is something other than the plug, but did not know that Vortecs are hard on injectors. Thanks,
    Ed
     
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