Betty (71.61.139.204) - Mon May 4 16:40:06 2009

The computer indicated a misfiring in a cyclinder. All 4 cyclinders were flushed out without improvement. One cyclinder was replaced. The light remained on and the computer still indicated a misfiring cyclinder. The mechanic stated it was an "internal engine problem. No solution offered.

Reply #1 candy (209.183.51.11) - Thu Aug 6 08:42:32 2009

I had the same thing occur with my saturn and finally found out the misfire was occuring from a failing oxygen sensor. The code for the sensor was never picked up by the diagnostics. I also replaced the inner compartment air filter behind the glove box when the sensor was changed and the misfire went away.

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