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High idle

Tiny
SUNCRAIG
  • MEMBER
  • 2003 CHEVROLET TRAILBLAZER
  • 2WD
  • AUTOMATIC
  • 87,000 MILES
I have a 03 chevy trailblazer and I have replaced the O2 sensor 3 times. System lean comes up on engine check. What is the problem? I cleaned the throttle body, changed the fuel filter. I did notice a rattle on start up around exhaust manifold. Just frustrated cuz the trail blazer has so many sensors and I dont have a clue.
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Monday, January 17th, 2011 AT 3:16 AM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Lean fuel condition could be caused by one of the following below:

1. Vacuum leaks
2. EGR and PCV valve.
3. Low fuel pressure.
4. Dirty fuel injectors.
5. Mass Air Flow Sensor.
6. Oxygen Sensor.
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Monday, January 17th, 2011 AT 10:58 AM

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