Question about 2000 Chevrolet Tracker

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I have a 2003 tracker 2.0 liter codes p0304 in it i replaced all plugs & # 4 coil sometimes it works fine & other times it misfires on # 4 misfires at idle & slow speeds but seems to pull fine at highway speeds ??

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  • Anonymous Mar 16, 2014

    idles ok but drives terrible at slow speeds under load



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Mary, Sounds like you have a lean missfire issue that may be caused by a dirty injector or possible air or vacuum leak at or near the injector. The injector is seated in a machined hole in the cylinder head or intake manifold. The injector is then sealed in the machined hole using an "O" ring seal to prevent unmetered air from entering the induction system. If the "O" ring is brittle, broken or damaged it will excess air into the system at low speeds and cause a lean fuel missfire to occur. Check to make sure there are no vacuum hoses running to #4 cylinder that are cracked or disconnected. Then
check around the injector base, you can squirt a small amount of carburetor cleaner around the injector base to see if the rough idle problem momentarily stops. If there is no change you may be looking an intermittent injector issue.
Let me know what you find before changing the injector.
Good luck.

Posted on Feb 24, 2009


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