2003 Saturn Ion Repair Question
Topics covered: Random misfire, Engine, Rpm.
Mileage: 175,000 miles.
Mileage: 175,000 miles.
Asked on November 28, 2010
2003 Saturn Ion C02 and Random Misfire
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?
Asked by pfootmomAnswer
Replied on November 28, 2010
Random misfire is usually caused by vacuum leaks and bad fuel.
Replied on November 28, 2010
Thanks. The car doesn't appear to have many vacuum lines but I will check again.
Replied on November 30, 2010
in addition to random misfire, the timing is advanced to 37 degrees at 2500 rpm - what is this?