Question about 2002 Chevrolet TrailBlazer

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Problems with rough idle and lugging/sluggish under mild excel

No Svc Codes. I've gone through all suggested checks and replacements. Can someone tell me how to test or get the coils tested for functionality.

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  • joneil16 Mar 08, 2009

    Thanks for the help, I wasn't clear on my motor. I have the 4.2 vortec. It's a different ignition system than the one in the autozone article. I tried to search for the vortec system but they didn't have it. I think it's strange that they have the trailblazer/voyer listed with this system. The TB only has the vortec motor?

  • joneil16 Mar 09, 2009

    Thanks, I'm going to have it hooked up the the data corder, and watch it a while.



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This page on autozone should help you test your coil

Posted on Mar 07, 2009

  • 1 more comment 
  • josh1111 Mar 09, 2009

    hmm well why do you think the coils are the problem mabey i can help otherwise.

  • josh1111 Mar 09, 2009

    does it have coil on plug ignition? ignition coils are connected directly to the spark plugs coils usually dont act up on idle but acceleration.

  • josh1111 Mar 09, 2009

    if it is cop you have to take it to a good mechanic and hook up to a computer to test



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