1992 Idle Speed
03-23-2007, 09:57 AM
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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
03-23-2007, 11:42 AM
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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.
03-23-2007, 12:21 PM
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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
I got mine down to 700.
03-23-2007, 12:37 PM
#6
Le Mans Master
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.
