Regal V6-191 3.1L (1991)
PROM - Programmable Read Only Memory: Customer Interest
PROM - Stalls, Long Cranks/Idle/Decel Surge
Group Ref.: Engine Fuel & Emission
Bulletin No.: 336506
Date: October, 1993
SUBJECT:
ENGINE STALL, LONG CRANKS/IDLE/DECEL SURGE
(DIAGNOSE/REPLACE PROM)
MODELS:
1990-93 BUICK REGAL, CHEVROLET BERETTA, CAVALIER, CORSICA, AND LUMINA, OLDSMOBILE CUTLASS, PONTIAC GRAND
PRIX AND SUNBIRD WITH 3.1L/3.4L ENGINE (RPO LHO, L01)
This bulletin cancels and supersedes Corporate Bulletin 236512R. Previous divisional publication numbers were:
GM of Canada
92-631-106
Oldsmobile
92-T-138
Pontiac
92-6-60A
Condition:
Some owners of 1990-93 J, L and W cars with the 3.1L engine may experience engine stalling, cold start stall and back-up stalls. Some owners of
1991-93 "W" cars with a 3.4L DOHC engine may experience a slight surge on an extended closed throttle decel when equipped with an automatic
transmission; and some owners of 1991-92 W-cars with a 3.4L DOHC engine and manual transmission may experience cold/hot stalls, diagnostic trouble
code 32 at high altitude, open loop drive-away sags and/or hesitation.
Cause:
Low volatility/high driveability index fuels now sold in the market place and engine variability conditions.
Correction:
If any of the subject conditions are experienced, they may be corrected by engine calibrations now available to improve engine operational stability and
cold (open loop) driveability.
Following procedure listed below:
1.
Perform diagnostics, per Section 6E of the Service Manual. Make any adjustments, as required, or replace any defective parts associated with the
causes described.
