Engine - Unstable Idle, Tip-In-Hesitation, or Stumble
84pontiac01Number 83-I-182 Section 6 Date 7/84
POOR COLD DRIVEABILITY--
Subject: 1983 PHOENIX WITH 2.5L EFI (LR8) ENGINE EQUIPPED WITH 4-SPEED MANUAL TRANSAXLE NATIONAL
Some early 1983 Phoenix 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 updated in order to reflect this PROM change.