1971 Corvette Fast Idle Start up
Thread Starter
Pro
Joined: Jan 2016
Posts: 534
Likes: 12
From: Ohio
1971 Corvette Fast Idle Start up
On Quadrajet Carburetor, when dead cold when start up, idles up to 1500 rpm. Choke is open. Backed screw out on fast idle one turn, still does it. Appx 15 seconds after start up it idles down to 750 rpm. Once engine is warmed up doesn't do that.
Ted
Ted
Le Mans Master
Joined: Jun 2006
Posts: 6,400
Likes: 1,226
From: Tampa Florida
If so,
"The control relay (GM 3990843) was a delay device. It served to override the
reversing relay and fire the CEC solenoid for a fixed period each time the engine was started.
After the fixed time interval (about 15 seconds), the relay self-latched removing it from the
circuit and relinquishing control to the reversing relay until it was reset when the car stopped
and the ignition was turned off."
Information was copied from this site:
https://manualzz.com/doc/6300991/pdf...crs---ncrs-rmc
Last edited by 71 Green 454; Oct 19, 2020 at 11:04 AM.
