2003 Saturn Ion C02 and Random Misfire

2003 SATURN ION
175,000 MILES • 4 CYL • 2WD • MANUAL
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PFOOTMOM
  • MEMBER
  • 4 POSTS
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?
Nov 27, 2010 at 11:39 PM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
Random misfire is usually caused by vacuum leaks and bad fuel.
Nov 28, 2010 at 1:32 AM
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PFOOTMOM
  • MEMBER
  • 4 POSTS
Thanks. The car doesn't appear to have many vacuum lines but I will check again.
Nov 28, 2010 at 5:18 AM
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PFOOTMOM
  • MEMBER
  • 4 POSTS
in addition to random misfire, the timing is advanced to 37 degrees at 2500 rpm - what is this?
Nov 29, 2010 at 8:57 PM
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