Question about 2002 Chevrolet TrailBlazer

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2002 Chevy Trailblazer, service engine soon flashing. Stuttering and rough ride, smell of gas and felt like engine was going to stall. Called onstar got a P0301 code misfire on cylinder one. Replaced the coil and now got code P0300 random misfire. Exchanged coil one and two still getting P0300 code. Replaced all of the sparkplugs, still getting the code. Found and repaired a vacuum leak but still getting the code. Car runs fine and code disappeared for a minute after the vacuum leak repaired. Now getting P0300 again and the car randomly stutters during idle, but drives fine.

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Hi.

The check engine light, driving problems and smell was in consequence of the misfires. If now the car drives fine, the vacuum leak could have been the cause of the original troubles. As far as I understood now the problem is only when idle.
Ensure that you have replaced the air filter , also double check vacuum and check/clean the air intake duct and sensors (IAT, MAP- see here for removal). Those are factors that can affect and cause misfire during idle. The IAC valve can also cause similar troubles and must be checked.

All the part listed above may cause lean or rich mixture. The problem is not necessarily detected by the O2 sensors in the exhaust and may result in no lean or rich code being stored in ECM.

If mixture and air intake are not responsible, and if the problem does not only occurr when idle, check the high voltage wires from coils to spark plugs (particularly if a code on a particular cylinder comes back). Check timing, valves, EGR and fuel pressure/fuel pump. Try doing an injector cleaning and check injectors (both spray and voltage).

Posted on Dec 20, 2010

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