1982 Idle Speed...
Thread Starter
Burning Brakes
Joined: Feb 2005
Posts: 847
Likes: 4
From: Atlanta
1982 Idle Speed...
Hey folks, what could be likely reasons for idle speed variation? Seems more noticeable now that it's gotten warmer. Without depressing the throttle, the engine does not really want to idle when it's first started. After a few cranks it mostly idles but gets is slow (3-4 hundred rpm, then picks up speed, only to slow down again; repeats this for a few minutes. After it begins to get some engine temperature it all smooths out.
O2 sensor???
No history of issues. It's all stock, or at least any parts were replaced with near-stock parts. This car always cranks right up and runs fine. Has always seemed to be a little sensitive to outside temperature but fine once it gets to its operating temperature.
As always, any thoughts are appreciated.....Mark
O2 sensor???
No history of issues. It's all stock, or at least any parts were replaced with near-stock parts. This car always cranks right up and runs fine. Has always seemed to be a little sensitive to outside temperature but fine once it gets to its operating temperature.
As always, any thoughts are appreciated.....Mark
Burning Brakes
Joined: Jan 2006
Posts: 1,154
Likes: 1
From: St Augustine FL
A multitude of things can be going on. Vacuum leaks, bad O2 sensor bad CTS sensor, Map Sensor, Bad prom or computer, TBI units out of balance. Bad EGR Valve, Timing could be off slightly...You will probabaly find it is a combo platter. Check out the link. It will show you how tune and balance the TBI units. Do you have a GM shop manual for your car?
My car was Idling way high and the TBI units were out of balance (way off) and I replaced the O2 sensor, the CTS sensor and Tuned the car following the directions in the linc below. Now the car idles at 800 rpm in park and 650 in gear. The car will initailly idle at 1200 rpm for 2-3 minuites at cold start and depending upon the temp outside untill it warms up a little then the idle drops off to what I described above.
http://www.corvettefever.com/techart...ing/index.html
My car was Idling way high and the TBI units were out of balance (way off) and I replaced the O2 sensor, the CTS sensor and Tuned the car following the directions in the linc below. Now the car idles at 800 rpm in park and 650 in gear. The car will initailly idle at 1200 rpm for 2-3 minuites at cold start and depending upon the temp outside untill it warms up a little then the idle drops off to what I described above.
http://www.corvettefever.com/techart...ing/index.html
Thread Starter
Burning Brakes
Joined: Feb 2005
Posts: 847
Likes: 4
From: Atlanta
A multitude of things can be going on. Vacuum leaks, bad O2 sensor bad CTS sensor, Map Sensor, Bad prom or computer, TBI units out of balance. Bad EGR Valve, Timing could be off slightly...You will probabaly find it is a combo platter. Check out the link. It will show you how tune and balance the TBI units. Do you have a GM shop manual for your car?
My car was Idling way high and the TBI units were out of balance (way off) and I replaced the O2 sensor, the CTS sensor and Tuned the car following the directions in the linc below. Now the car idles at 800 rpm in park and 650 in gear. The car will initailly idle at 1200 rpm for 2-3 minuites at cold start and depending upon the temp outside untill it warms up a little then the idle drops off to what I described above.
http://www.corvettefever.com/techart...ing/index.html
My car was Idling way high and the TBI units were out of balance (way off) and I replaced the O2 sensor, the CTS sensor and Tuned the car following the directions in the linc below. Now the car idles at 800 rpm in park and 650 in gear. The car will initailly idle at 1200 rpm for 2-3 minuites at cold start and depending upon the temp outside untill it warms up a little then the idle drops off to what I described above.
http://www.corvettefever.com/techart...ing/index.html
Mark
Last edited by funymuny; Apr 20, 2008 at 02:40 PM.
