2003 Saturn Ion C02 and Random Misfire

Tiny
PFOOTMOM
  • MEMBER
  • 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?
Sunday, November 28th, 2010 AT 7:39 AM

3 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
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
  • 4 POSTS
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
  • 4 POSTS
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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