Question about 2002 Pontiac Grand Am

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Misfire, 2002 3.4 l, V-6, Grand Am, only after sitting out in sun

Hot weather with direct sunlight on this black Grand Am will cause a significant misfire. It has done this off and on for years, but only once or twice a year. Back then the service engine light stayed on and it always self-corrected with a little driving and then restarting engine. Now, service engine light flashes, (not good), engine runs rough and only returns to normal after hours of cooling down in the shade or over night. Stays fine, runs normal for weeks, until it sits out all day in very hot weather, especially if the hood is facing the sun. I strongly suspect a sensor malfunction. Registers OBD code PO206 and PO306 indicate injector circuit and misfire # 6 cylinder. Another time, same symptom, O2 sensor code PO132 was registered. What should I look for? Both O2 sensors have been replaced within the last year, less than 5000 miles ago as part of regular maintanence.

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I would check wiring at injector 6 for a bad contact if ok test injector

Posted on Jun 23, 2009

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