IDLE PROBLEM
05-17-2005, 07:18 PM
#1
3rd Gear Member
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Join Date: Mar 2005
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Posts: 625
IDLE PROBLEM
My car is a 88 GT. I have tried to reset the idle several times. It still idles too high. When I disconnect the IAC the idle comes down to where it should be. I can turn the idle down to where it should be with the IAC connected but the butterfly catches on the TB. The lowest I can get the idle is about 1200 without it catching. Anybody else have this problem? Any help would be greatly appreciated.
Also, the IAC is new.
Thanks
Also, the IAC is new.
Thanks
05-17-2005, 08:40 PM
#4
RE: IDLE PROBLEM
Sounds like a vacuum leak. When I was working on my car and forgot to put a vaccum plug back on, the idle wouldn't come down, below at about what you're saying. Since your 88 , it's speed density and looks at vacuum to see how much the engine is under load. when the MAp sensor sees lees vaccum, it thinks the engine is at more RPM and more of a load, don't ask why it doesn't look at RPM vs Vaccum at idle, 80's technology... thus the higher RPM at idle.
05-17-2005, 08:42 PM
#5
6th Gear Member
Join Date: Feb 2005
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Posts: 5,205
RE: IDLE PROBLEM
ORIGINAL: 86HOGT
Sounds like a vacuum leak. When I was working on my car and forgot to put a vaccum plug back on, the idle wouldn't come down, below at about what you're saying. Since your 88 , it's speed density and looks at vacuum to see how much the engine is under load. when the MAp sensor sees lees vaccum, it thinks the engine is at more RPM and more of a load, don't ask why it doesn't look at RPM vs Vaccum at idle, 80's technology... thus the higher RPM at idle.
Sounds like a vacuum leak. When I was working on my car and forgot to put a vaccum plug back on, the idle wouldn't come down, below at about what you're saying. Since your 88 , it's speed density and looks at vacuum to see how much the engine is under load. when the MAp sensor sees lees vaccum, it thinks the engine is at more RPM and more of a load, don't ask why it doesn't look at RPM vs Vaccum at idle, 80's technology... thus the higher RPM at idle.
05-17-2005, 09:38 PM
#7
3rd Gear Member
Thread Starter
Join Date: Mar 2005
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Posts: 625
RE: IDLE PROBLEM
I think I got it. I put in the IAC restrictor plate with a 5/32" hole. Then reset the idle and disconected the battery. Now it idles at 800-900rpm without the TB butterfly catching. Hope the idle holds.
thanks guys
thanks guys
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