Question about 2004 Chevrolet TrailBlazer

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P0302 , My check engine light keeps going on and off with this code. I have failed inspection twice because the light was off and then popped on again in the bay while idling. It always comes on when the Chevy Trailblazer is sitting still. Can anyone help me with what I can do? Had engine repair two yrs ago, 2600. dollars worth of work on the second cylinder and now it is the same cylinder missfiring. Thanks ahead of time for your advice.

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Cylinder #2 Misfire Detected
What does that mean? A P0302 code means that the the car's computer has detected that one of the engine's cylinders is not firing properly. In this case it's cylinder #2.
Symptoms Symptoms may include:

  • the engine may be harder to start
  • the engine may stumble / stumble, and/or hesitate
  • other symptoms may also be present
Causes A code P0302 may mean that one or more of the following has happened:
  • Faulty spark plug or wire
  • Faulty coil (pack)
  • Faulty oxygen sensor(s)
  • Faulty fuel injector
  • Burned exhaust valve
  • Faulty catalytic converter(s)
  • Running out of fuel
  • Poor compression
  • Defective computer
Possible Solutions If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.
If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.

Posted on Oct 02, 2009

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P0302 misfire cyl #2 can be caused by a number of things. First perform compression check,then check ignition system(coil,spark plug etc). Since it seems to occur at an idle I would be especially suspect of a clogged injector or vacuum leak, check intake runner and any hoses very carefully . Good Luck

Posted on Oct 02, 2009

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