1991 Chevy Camaro idling.

Tiny
CRAZYWHITE50
  • MEMBER
  • 1991 CHEVROLET CAMARO
  • V8
  • 2WD
  • AUTOMATIC
  • 121,101 MILES
Hello, I have a little problem with my car. Its a 1991 chevy camaro rs 305 v8. I went through alot with this car. And recently ive been having this problem when id get to a red light my idle would bog a little bit and rev up as if it would take off. But it never dies. I changed the spark plugs, wires, cap, rotor, fuel filter, TPS. The idles are great in park and when im driving. Its smooth. Then when im stopped for about 5 seconds it starts bogging. But it only bogs when it gets under 1000 rpms. My rpms never go over 1000 in idle it stays at 800 but then bogs. Anything coolant related is fine as well. It doesnt overheat, it stays at my thermostat reading 185 F. I hear the fuel pump turn on and work. Any suggestions on what could be the problem before I look into it? Maybe the IAC valve? Thanks very much.
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Thursday, August 19th, 2010 AT 1:25 PM

4 Replies

Tiny
WRENCHTECH
  • EXPERT
You may have a bad IAC ( idle air control) but try cleaning the throttle body first. Remove the intake snorkel, have someone hold the throttle wide open for you and scrub the back side of the throttle plate and surrounding bore with an old tooth brush and some carb cleaner. Be sure to spray some into the small holes next to the throttle plate. That should help stabilize the idle. If it still has a problem, replace the IAC.
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Thursday, August 19th, 2010 AT 1:47 PM
Tiny
CRAZYWHITE50
  • MEMBER
Hello again, and thanks for the information. I cleaned the throttle body plates as told very well and threw in a new idle air control valve and waited for operating tempurature and shut it off. Waiting a couple minutes. Then I turned it on. Still same thing. But ive noticied a licking sound when it bogs down and up. I can feel it on my brake pedal a little bit and it sounds more up in the engine. It clicks whenever it bogs but not when im driving. Any other suggestions? Maybe a TPS adjustment to a higher voltage other than between.54 and.56? Or do you think it could be lower than the normal? Thanks very much.
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Friday, August 20th, 2010 AT 11:33 AM
Tiny
WRENCHTECH
  • EXPERT
Your going to need a scan tool to go any further here.
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Friday, August 20th, 2010 AT 11:55 AM
Tiny
BDOGG0070
  • MEMBER
Have you thought about the egr my 88 camaro did similer to that and I changed the egr valve and it runs perfect now.
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Friday, August 20th, 2010 AT 6:38 PM

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