Engine Controls - Poor Cold Driveability
84chevy10Number: 83-142
Section: 6E (VIt)
Date: August, 1984
Subject: POOR COLD DRIVEABILITY
Model and Year: 1983 CITATION WITH 2.5L EFI ENGINE EQUIPPED WITH 4-SPEED MANUAL TRANSAXLE NATIONAL
TO: ALL CHEVROLET DEALERS
Some early 1983 Citation model vehicles equipped with the 2.5L engine (VIN Code R) and 4-speed manual transaxle may exhibit a rolling unstable idle, tip-in hesitation or stumble while being driven when cold.
If this condition occurs, a new PROM has been released for service correction.
Original PROM New PROM
P/N 1226348 P/N 1226480
Broadcast Code AXN* Broadcast Code CHX
When the new PROM is installed, the broadcast code on the paper label affixed to the ECM should be marked with an ink pen to reflect this PROM change. This information will be helpful if future ECM service is required.
*NOTICE: The PROM broadcast code is stamped on the
PROM in white ink.