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1996 Buick Century High Idle

Tiny
CBFBFAN
  • MEMBER
  • 1996 BUICK CENTURY
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 72,077 MILES
I bought a 1996 Buick century with a 3100 engine. It's idling very high. I changed the IAC valve. This took it down from 2400 to 1400 RPM's. It's supposed to be 700. It's not throwing a code. All the parameters check out with a modis. There are no vacuum leaks, I checked around the intake and injectors with starting fluid (dangerous I know) and all hoses appear to be good. It looks like (not positive) someone change the crank sensor. Any ideas? I wasted today on it, and it's becoming frustrating.
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Saturday, January 16th, 2010 AT 8:16 PM

2 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Did you clean out the IACV passages? Test the throttle position sensor, also check if its locked-up in open loop mode-also check if the throttle plate is closing completely and sticking linkages and kinked acc cable
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Saturday, January 16th, 2010 AT 8:40 PM
Tiny
CBFBFAN
  • MEMBER
  • 2 POSTS
I did not clean out the IACV passage. The plunger looked clean and I never thought to look. The only reason I change the IAC is nothing changed when I pulled the plug. It didn't die or change the idle. I did check out the TPS. It seems to be functioning. Thanks for your help, I'll try your suggestions.
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Saturday, January 16th, 2010 AT 8:46 PM

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