1992 Idle Speed
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Joined: Dec 2002
Posts: 89
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From: Santa Fe NM
1992 Idle Speed
My 1992 corvette with manual transmission is running and operating fine, 153k miles. After warmup the idle speed is always at 900 rpm. Is this normal, I would of thought it should be down around 500 rpm? The service manual does not give a value for the idle speed to be at, just says that there is no idle adjustment - idle is controled by computer. I believe my IAC is working fine due the the fact that the idle is higher at start up, about 1150 rpm.
Thanks, Patrick
Thanks, Patrick
Team Owner
Joined: Oct 2000
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From: Fort Knox, KY
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Check the C4 Tech Tips Section on this forum on how to remove and clean your TB, IAC motor and check base idle.
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Joined: Dec 2006
Posts: 60
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From: Finland , 1995 LT-4 P-1SC
My 1992 corvette with manual transmission is running and operating fine, 153k miles. After warmup the idle speed is always at 900 rpm. Is this normal, I would of thought it should be down around 500 rpm? The service manual does not give a value for the idle speed to be at, just says that there is no idle adjustment - idle is controled by computer. I believe my IAC is working fine due the the fact that the idle is higher at start up, about 1150 rpm.
Thanks, Patrick
Thanks, Patrick
Le Mans Master
Joined: Jun 2006
Posts: 5,642
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From: One day you're a Comet...the next day you're dust... Arkansas
I got mine down to 700.
Le Mans Master
Joined: Feb 2006
Posts: 8,753
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From: Louisiana
Does it sound like 900 RPM?
Is the SES or SYS light on?
The 90-96 TPS's are not adjustable but you can check the voltage anyway. Also cleaning the throttle body and IAC is a good idea if it hasn't been done in the last 30K miles. Also make sure there are no vac leaks. A scan would help.
Is the SES or SYS light on?
The 90-96 TPS's are not adjustable but you can check the voltage anyway. Also cleaning the throttle body and IAC is a good idea if it hasn't been done in the last 30K miles. Also make sure there are no vac leaks. A scan would help.
