1994 Pontiac Bonneville

Tiny
U858033
  • MEMBER
  • 1994 PONTIAC BONNEVILLE
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 13,200 MILES
I have a high idle on my 1994 Pontiac Bonneville. I have replaced the idle control valve and its still idling high. Any ideals what esle to do. The engine light is not on.
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Tuesday, April 29th, 2008 AT 4:13 PM

14 Replies

Tiny
BLACKOP555
  • EXPERT
Check for a faulty PCV valve first, test it by shaking it, if it doesnt rattle its bad.

Next check for vaccum leaks. Take a can of carb cleaner and spray around all gaskets and vaccum hoses with engine running, if idle changes youve found a leak.
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Tuesday, April 29th, 2008 AT 5:42 PM
Tiny
U858033
  • MEMBER
Well no vaccum leaks>
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Wednesday, April 30th, 2008 AT 6:08 AM
Tiny
BLACKOP555
  • EXPERT
Clean out the throttle body, it may be plugged, also the EGR valve could be sticking causing it to run faster.
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Wednesday, April 30th, 2008 AT 2:36 PM
Tiny
U858033
  • MEMBER
I have done all this thottle body is clean. EGR valve is working?It idles about 1500 Rpms and sometimes gets higher and sometimes goes down when it gets hotter but not much. I don' t know what esle to do?
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Sunday, May 11th, 2008 AT 10:08 PM
Tiny
BLACKOP555
  • EXPERT
Can you manually adjust the idle level by turning an adjusting bolt or screw? Maybe throttle cable is tight and needs adjusting.

A smoketest is the best way to find a vaccum leak.
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Monday, May 12th, 2008 AT 3:54 PM
Tiny
U858033
  • MEMBER
The flap on the thottle body closes all the way.
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Friday, May 16th, 2008 AT 6:06 AM
Tiny
BLACKOP555
  • EXPERT
There may or may not be a idle adjust screw somewhere near where the accelerator cable hooks to the throttle body, that may be screwed in to far.
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Friday, May 16th, 2008 AT 7:15 AM
Tiny
U858033
  • MEMBER
No screws. Sometimes I start it and it idles up real fast.I can turn the car off and start it back up and it idles back down to normal. I just don't know what to do.
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Wednesday, May 21st, 2008 AT 2:39 AM
Tiny
BLACKOP555
  • EXPERT
Will idle come down by itself if you dont turn it off and restart?
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Wednesday, May 21st, 2008 AT 6:54 AM
Tiny
U858033
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No, the idle usually keeps getting higher and higher. Even sometimes when I restart it. It doesn't go down. It might do good all day and then all at once start idling crazy. I think I'm going to set it on fire.
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Wednesday, May 21st, 2008 AT 11:02 PM
Tiny
BLACKOP555
  • EXPERT
Sounds like the IAC module, my first prediction, did you say you already replaced it?

It could be the ECM controling it improperly, check the harness from the IAC module all the way back.
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Thursday, May 22nd, 2008 AT 7:08 AM
Tiny
MUNKIEBOY
  • MEMBER
In addition to previous posters suggestions, double check and make sure that u purchased and installed the correct IAC for your specific model, year, etc. It's not likely that an incorrect IAC would have the same connections but I've seen it happen and the problem really sounds like your IAC. Also take a look @ your Mass Air Flow sensor. Usually a bad MAF would just cause the car to stall but a dirty one might cause it to freak out. Lastly, you may have a bad fuel pressure regulator. You can check it by attaching a fuel pressure gauge to the schrader valve on the fuel rail and turn the ignition w/o cranking the engine. Your psi should be about 40-43 psi. If it's higher it could be your FPR letting the fuel pump go nuts, hence the high idle.
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Friday, June 13th, 2008 AT 3:56 AM
Tiny
U858033
  • MEMBER
I finally checked the TPS with my voltage meter And it was reading wild. It is supposed to read about.5 volts with the Throttle closed, it was reading 2 volts. I would move the throttle like giving it gas and the voltage would jump around everywhere. It has 5 volts coming to it and should have 5 volts going out with the throttle wide open. I just want everybody know just in case someone else had these same problems. Plus the transmission gears didn't change right. Thanks for all the Emails trying to help.
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+1
Sunday, September 7th, 2008 AT 3:54 PM
Tiny
BLACKOP555
  • EXPERT
Thank you for posting back and I can gaurentee this will help someone!
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Monday, September 8th, 2008 AT 6:09 PM

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