C02 AND RANDOM MISFIRE

2003 Saturn Ion

Tiny

pfootmom

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?

3 Answers

Tiny

rasmataz

November, 28, 2010 AT 9:32 AM

Random misfire is usually caused by vacuum leaks and bad fuel.

Tiny

pfootmom

November, 28, 2010 AT 1:18 PM

Thanks. The car doesn't appear to have many vacuum lines but I will check again.

Tiny

pfootmom

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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