2003 SATURN ION C02 AND RANDOM MISFIRE

  • Tiny
  • pfootmom
  • 2003 Saturn Ion
  • 4 CYL
  • 2WD
  • manual
  • 175,000 miles

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?

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Sunday, November 28th, 2010 AT 7:39 AM

3 Replies

  • Tiny
  • rasmataz
  • Member

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

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Sunday, November 28th, 2010 AT 9:32 AM
  • Tiny
  • pfootmom
  • Member

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

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Sunday, November 28th, 2010 AT 1:18 PM
  • Tiny
  • pfootmom
  • Member

In addition to random misfire, the timing is advanced to 37 degrees at 2500 rpm - what is this?

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Tuesday, November 30th, 2010 AT 4:57 AM

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