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C02 AND RANDOM MISFIRE
2003 Saturn Ion
November, 28, 2010 AT 7:39 AM
Car running badly and stalling. Ran code reader- codes 137, 141 and 0300. Replace O2 sensor #2. Still get random misfire and engine light came on after erasing codes. Ran code reader again, code 0300. What could it be? What causes random misfire?
FOUND 456 RELATED QUESTIONS
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November, 28, 2010 AT 9:32 AM
Random misfire is usually caused by vacuum leaks and bad fuel.
November, 28, 2010 AT 1:18 PM
Thanks. The car doesn't appear to have many vacuum lines but I will check again.
November, 30, 2010 AT 4:57 AM
In addition to random misfire, the timing is advanced to 37 degrees at 2500 rpm - what is this?
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