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91 Camaro RS rough idle

Tiny
JASONF
  • MEMBER
  • 1991 CHEVROLET CAMARO
I have a 91 RS Camaro with a TBI 5.0 V8. I have been having a problem with it idling rough when it is fully warmed up. When first started it will run and idle perfect, but after driving a few miles and stopping it will not idle at a steady rpm. It will idle at about 500 rpm and constantly bog down to about 100-200 rpm every second or two. I had a full tune up with new plugs, wires, fuel filter, and distributor, but it didn't help any.
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Friday, March 23rd, 2007 AT 8:07 PM

3 Replies

Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
Check both the idle air controller, on the side of the tbi. And the mass air flow sensor.
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Tuesday, April 17th, 2007 AT 9:36 AM
Tiny
JASONF
  • MEMBER
  • 6 POSTS
I replaced the Idle Air Controller but it didn't help.
I'm not sure where the mass air flow sensor is. Is that the same as the M.A.P. Sensor (which is on the firewall) or is one of the 2 sensors inside the air cleaner?
Do you think that a o2 sensor could be causing the problem? I don't think it was ever replaced with 136000 miles on it.
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Monday, July 2nd, 2007 AT 10:12 PM
Tiny
JASONF
  • MEMBER
  • 6 POSTS
I replaced the o2 sensor and it still didn't fix the rough idle. I just sold the car and bought a BMW, problem solved!
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Wednesday, December 3rd, 2008 AT 10:34 PM

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