Question about 2004 Chevrolet Cavalier

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2004 chevy cavalier misfiring

GA_googleFillSlot("Forums_ROS_300x250_noad"); I have an issue with a 2004 Cavalier, when at an idle in feels as if it is going to stall, the RPM go from around 700 and drop sharply to 500, at this time the dash lights flicker slightly also. When driving the car there is no issue it rides just fine once the gas pedal is depressed. Also when the car is at an idle there is sound I can only describe as one fo those garage doors that open and close by pulling a rotating chain, only really fast. Now for the things that have been done to try and remedy the problem are as follows: The spark plugs have been changed, there has been fuel injector cleaner run through the car, the throttle body has been cleaned out, the IAC motor was visually inspected and cleaned and it appears to be fine, the coil pack doesnt seem to have any issues and autozone has pulled a code out of the car p0300 which doesnt help much. I have been told that possibly the timing has been thrown off and that all that junk in there needs to be changed. Which is fine, but it is expensive as is all the rest of the possible fixes for this car. I guess my question is how likely is this issue to be, the ERG valve, fuel pump, timing issue, a blown head, or anything else I havent found in any research I have done. Thank you in advance for any help you can offer.

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  • unscrewed11 Dec 08, 2008

    It does this at all times heat on or off, it has been suggested that it could also be the alternator, but that doesnt make sense to me.

  • unscrewed11 Dec 08, 2008

    Another thing it is worse when there is drag on the engine, when in drive, at neutral or in park in isnt as bad as when in drive, but still does this, no check engine light is coming on, it only came on once the plugs were changed and it went off hasnt come back on again.

  • unscrewed11 Dec 08, 2008

    Thanks for the answer, however I am a **** when it comes to knowing much about cars, could you tell me where the ERG valve is and what do you mean by a low cylinder, how does one go about checking the compression?

  • unscrewed11 Dec 08, 2008

    Should it be this issue what is the fix if there is one?

  • unscrewed11 Dec 08, 2008

    I appreciate your time in answering my questions thatnk you very much!

  • lnbrowning Dec 30, 2008

    I have the same problem but only at idle. The car has no hesitation or missing when you aply the pedal. Had code po300 on check engine. Put new plugs and boots on. Need Help!!!!



    .

  • jdj_rag Apr 14, 2009

    I have one doing the same thing. the 300 code is a misfire. on mine i have lost 60 lbs of compression in the #1 cylinder. you might want to have a compression test done.

  • mikehumble May 11, 2010

    try removing the serentine belt to eliminate any accesory drag such as the alternator but do not let it run long enough to over heat

  • mikehumble May 11, 2010

    try turning off your heater and see if the problem is still there. it may be your airconditioning pump cylcling if the pump is bad it will drag down the motor at idle and make that noise. The AC pump runs when the AC is on and when the defrosters are on.

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Have a compression test done. a 300 code is a misfire

Posted on Apr 14, 2009

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Po300 is a multiple cylinder misfire code. the noise you mention sounds like a timing chain noise.These cars will make noise from timing area when guides wear/chain stretches.As I cant hear myself not 100% sure,but is common.Have you checked compression? a low cylinder could throw things off. if timing has jumped it would also be culprit but would usually have loss of power or other driving issues. Check egr valve and see if it is hanging open.There are so many possibilities as to your problem it is best to have someone scan computer to see what values all the sensors are seeing.Best thing to do first would be check compression

Posted on Dec 08, 2008

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  • TripleTauto
    TripleTauto Dec 08, 2008

    By low cylinder i mean low compression. to check compression you will need a compression gauge. the plugs will need to be out and ignition disabled!!!!! the gauge screws in the spark plug hol;es and will check pressure when you spin over all the cylinders should be even within about 10lbs of each other. if one is low it will not deliver the power it should and cause a skip. this is usually most noticeable at idle as when you drive engine is spinning faster and can build more compression

  • TripleTauto
    TripleTauto Dec 08, 2008

    this will depend on what is causing. if you have a low cylinder it will need to be leak checked to see where air is going. this is done by applying air to cylinder and listening for where it escapes if it comes out intake it is an intake valve problem,out exhaust it is exhaust valve andout of crankcase it is piston/ring problem.It is best to have checked out rather than trying to guess and throw parts at it. this may or may not be the problem it is just one test that needs to be done

  • TripleTauto
    TripleTauto Dec 08, 2008

    no problem good luck, let me know what you find

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Head gasket

Posted on Dec 15, 2008

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