Question about 2002 Chevrolet TrailBlazer

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My 2002 trailblazer was missing, so I took it to the shop. They put a tune-up on it, but it is still missing. They said I need a timing chain, truck has 110,000 miles.

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  • jayndeeguy Feb 20, 2009

    they said they put plugs & wires. Seems to miss more when truck warms up.

  • 240cpa May 11, 2010

    What does the bill from the shop say that they replaced? With the engine running and the vehicle in park, look at the engine in the dark and look for a spark jumping from either the plugs at the head or from the wires themselves. If that all looks good, check for a loose wire after you shut the engine off. Your original problem could have been a bad air mass meter or sensor. Did they check the computer for trouble codes before diving in?

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Timing chain usually does not cause a miss. It may run sluggish or even backfire, but a miss is like a spark plug with the wire off. Like a dead cylinder. Chevy timing chains do stretch but those engines can handle quite abit of timing. I had one with 120K miles and it was only off 4 degrees. That's nothing for chevy to handle. A tune up is usually nothing but a set of plugs and a hook up to a diagnostic machine. I would look deeper. Go out at night, start the engine with the hood open. Make sure you are in a very dark place. Look for sparks jumping from plug wire. Another way to to use a spray bottle of water. Spray a very fine mist of water around the wires. If they are bad, a spark will jump. Check cap for deposits. You can only hope that the plugs were gapped right.
Good luck

Posted on Feb 20, 2009

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