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2005 Chevy Aveo Random misfire - check engine light on

Tiny
VFAYEPARKER
  • MEMBER
  • 2005 CHEVROLET AVEO
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 75,000 MILES
Please advise. Feel like we are being ripped off by local mechanics. Check engine light comes on often. Light reads random misfire error. We had a tune up and had the O2 sensor replaced but the light still comes on periodically, car jerks and sputters.

Were told to let the car warm up before putting into gear. Were told it may have to do with the HOLD button being engaged accidently. Were told it may be a coil problem.

I'm afraid my teenager will be stranded on the highway. Please advise.
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Wednesday, June 9th, 2010 AT 3:00 PM

2 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
P0300 Random misfires normally caused by vacuum leaks and bad fuel other causes below

1. Defective spark plug.
2. Inadequate spark/coil, defective spark plug wire.
3. Lack of compression
4. False air leakage.
5. Faulty fuel injectors.
6. Insufficient fuel pressure.
7. Contaminated fuel.
8. EGR valve that is leaking.
9. Oxygen sensors.
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Wednesday, June 9th, 2010 AT 3:45 PM
Tiny
SPIROV1610
  • MEMBER
  • 2 POSTS
These engines suffer mostly from leaking exhaust valves due to accumulated carbon deposits arround the area near the valve guides. There are modified exhaust valves with special groove near the valve head. Check the fuel trims on idle and if they are to minus value, valves' seats are the problem.
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Sunday, June 13th, 2010 AT 10:08 AM

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