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94 Buick won't come out of high idle after warmed up
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ToP-fan
New User
Jan 17, 2010, 10:44 AM
Post #1 of 5
(5103 views)
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94 Buick won't come out of high idle after warmed up
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I have a 94 Buick Century, 3.1 ltr engine with roughly 128,000 mi.........In the past few months, once the car has warmed up, it has a tendency to stay in a fast idle.
I took it to my mechanic and he ran diagnostics and couldn't find anything...........He said to bring it in when it was doing it and could get a better read on it.
One day it was doing it and I was in his neck of the woods,.....so I drove it in...............Right away he said it was the IAC motor and that was replaced.
The next couple of days I didn't drive it enough for it to really warm up, so it was fine........After my first highway drive a couple of days later when I got to regular low rpm driving it did it again..............Called the mechanic up and stated it was still doing it again he said to bring it in for an adjustment....(no charge).
It was ok for a couple of days and now it's doing it again.
Things I've noticed:
1. It only does this after it's been running 15 minutes
or so.
2. If I'm at a red light and it's doing it, I'll turn off the ignition and start it back up and it will idle down....but only for a few minutes.
3. The common denominator seems to be the degree that it's warmed up...............If I'm on my way to a store and I'm there say an hour, it will stay at normal idle for awhile, but if I have to go anywhere with a signifigant distance, it will stay ramped up until it's cooled down.
Any imput would be great!
Thanks,
ToP-fan
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steve01832
Veteran
Jan 17, 2010, 2:00 PM
Post #2 of 5
(5090 views)
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Re: 94 Buick won't come out of high idle after warmed up
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The first thing to do is make sure you don't have any vacuum leaks. These engines are famous for intakes leaking. Another thing to check would be the throttle plate stop screw. It looks like an idle speed adjuster and many people drill out the cap and use it as such. Make sure it is not holding the throttle open, if it is, you can adjust it down. This is where you may want to start looking.
Steve
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brager
User
Jan 17, 2010, 2:36 PM
Post #3 of 5
(5086 views)
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Re: 94 Buick won't come out of high idle after warmed up
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Ask your technition if he cleaned out the IAC passages? also did he test the throttle position sensore?
and what about the throttle plate is it closing completely? i would also check the linkages for any binding and
any kinks in the acc cable
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ToP-fan
New User
Jan 17, 2010, 6:34 PM
Post #4 of 5
(5081 views)
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Re: 94 Buick won't come out of high idle after warmed up
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Thanks guys,
I'll be back to the garage this week with your recommendations..........I'll keep you posted.
ToP-fan
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ToP-fan
New User
Jan 28, 2010, 10:15 PM
Post #5 of 5
(5048 views)
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Re: 94 Buick won't come out of high idle after warmed up
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Follow up: I brought the car back to my mechanic last week along with your recommendations. He checked it out and said the IAC motor was defective and replaced it.............Well, it's a little better,.......BUT, after highway driving it still has a fast rpm.............At a stop sign or red light, I shut it off and start it right back up and the idle comes right down.............Then it'll be ok as long as I'm city driving.
I'm at wits end with this and going to take it to another mechanic.
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