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2001 Chevy Monte Carlo LS 3.4l

Tiny
WIGGITY55
  • MEMBER
  • 2001 CHEVROLET TRUCK
I have a chevy monte carlo ls with 115k miles on it. Recently it has been stalling and sometimes backfires for about for the first few minutes it is running wether the engine is worm or not, then runs fine but seems to lose power from time to time. Also the check engine light has came on and the codes read bad o2 sensors, which I replaced and reset the coeds and it came back on and read the same thing. I hae also replaced the plugs and plug wires, ignition coils, and mass air flow sensor. What could be the problem?
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Thursday, April 12th, 2007 AT 7:00 PM

3 Replies

Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
What codes were they for the o2 sensors? Lean, shorted? Seen problems with the cat converters on those Monte's. How is the fuel pressure?
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Friday, April 13th, 2007 AT 8:11 AM
Tiny
WIGGITY55
  • MEMBER
  • 3 POSTS
The guy at the repair shop never told me if it was running rich or lean. He just said they were bad and I had the fuel system pressure cleaned about six months ago. I plan on getting the fuel pressure tested and replacing the fuel pressure regulator today
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Friday, April 13th, 2007 AT 12:26 PM
Tiny
WIGGITY55
  • MEMBER
  • 3 POSTS
Ok so far ive replaced the cat converter, fuel pump, fuel pressure regulator, and map sensor and im still having the same problem only its not as bad anymore
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Wednesday, May 23rd, 2007 AT 5:29 PM

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