I recently purchased a 82 corvette with 19000 miles. The car runs great
except at idle when it is cold, it idles rough and the exhaust is very rich
with gas. Once it warms up it is fine. I checked the resistance of the temp.
sensor both hot and cold and it was in spec. I was on the alldata web site for
this car and they said chevy had released a new prom to lean the fuel
calibration during cold operation and unlock the torque converter at lower
throttle opening in sept. of 82. Any help would be greatly appreciated !
Thank You and I hope everyone has a Happy Holiday!

 

This sounds about normal...When the motor is cold, there is a problem of fuel puddling in the manifold. So it's not something to worry about....

For lots more information on you L83 Crossfire motor.
Goto this forum http://www.crossfire.homeip.net:81/

Welcome to the Corvette Forum. Hope you enjoy your stay.
(because once you find this place, you can never leave)

And hurry up and post a picture of your vette... :seeya

 

This was a subject on the other forum recently. the person there said it worked for his similar problem which you described.
**************************************** ************************
1982: Service Bulletin: Spark Plug Fouling/Driveability Improvements
Subject: SPARK PLUG FOULING/DRIVEABILITY IMPROVEMENTS - 1982 CORVETTE WITH FEDERAL EMISSIONS
Model and Year: 1982 Corvette with Federal Emissions
Source: Chevrolet Dealer Service Technical Bulletin
Bulletin Number: 82-T-101
Number: VIt
Section: Aug., 1982

TO: ALL CHEVROLET DEALERS

A new PROM has been released for the 1982 Corvette to reduce the possibility of spark plug fouling and to enhance driveability. This new PROM leans the fuel calibration during cold engine operation and unlocks the torque converter at a lower throttle opening.
NEW ECM 16029531
PROM Identification 391A36
Service Prom 1226096
In addition, check spark plugs for fuel fouling and replace if necessary. Use care when removing spark plug wire boots from spark plugs. Twist the boot one-half turn before removing, and pull on the boot only to remove the wire. Check to make sure plug wires are routed correctly and through the proper retainers.

Use applicable labor operations.
**************************************** ************************
The Delco #1226096 "is a discontinued chip" & only a few dealers have 1 or 2 on their shelves so you will have to work to find one.

Brent...

 

dwain, if you canot find this prom, call me at the shop I willhelp you find one :cheers: 615-255-3939 :eek: hop this helps welcome to the forum,enjoy your new toy

 

You might want to check that the 'air bypass valves' on the two throttle bodies are not dirty. Clogged bypass valves will result in the same condition.