Question about 1997 Chevrolet Cavalier

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I have 97 cavalier with 148,000 miles 2.4l dohc went to do my smog check n show has a code po304 cylender 4 is misfire the guys did a compression test on the cylender showed 65 psi only. the car had new plugs oil change gas filter but not sure how to fix this. any ideas!! thanks..

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  • fred415 Feb 01, 2010

    have new plugs but i think the cylinder head is bad. maybe need new valve or something cause engine compression is 65 psi on cylinder 4 evething else is fine

  • fred415 Feb 01, 2010

    i scanned the car today n showed misfire cylinder 4 maybe is the valve is not working or coil pack but did the engine compression cylinder is only 65psi and everything else is 110 psi compression.

  • fred415 Feb 01, 2010

    im guessing bad valve..



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P0304 Code - Cylinder #4 Misfire Technical Description Cylinder #4 Misfire Detected
What does that mean? A P0304 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 #4.
FB.init("dd7d9e9681341cde77587bc6a2029f6f"); on Facebooki have 97 cavalier with 148,000 miles 2.4l - copyscape.gif SymptomsSymptoms 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 P0304 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 Feb 01, 2010


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Failed smog check

po304 is just that #4 cyl has a problem could be a bad spark plug or a bad plug wire or bolth
if it hasnt had an ign tuneup its time.
the po138 is just telling you one of the cylinders isnt burning all the fuel put into that cyl.
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if ya need any more info let me know
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