PROM - Occasional Engine Stall
90chevy21Number: 89-276-6E
Section: 6E
Date: March 1990
Corp. Bulletin No: 936001
Subject: OCCASIONAL ENGINE STALL
Month and Year: 1988 J CAR AND 1989 A, J, L CAR WITH 2.8L (VIN CODE W) ENGINE
THIS BULLETIN CANCELS AND SUPERSEDES DEALER SERVICE BULLETIN NO. 89-88-6E, DATED MARCH 1989. IT HAS BEEN REVISED TO CLARIFY THE MODEL USAGE IN THE MEMCAL CHART AND TO CHANGE THE PARTS STATEMENT. PLEASE DISCARD ALL COPIES OF 89-88-6E.
Some customers driving 1988 J cars and 1989 A, J, L cars with 2.8L (VIN CODE W) engines may comment concerning any of the following:
A cold start stall, A tip-in hesitation, or A decel stall
If a customer comment concerning an occasional engine stall or a drive hesitation is received, then complete the following:
1. Perform diagnostic checks, per Section 6E of the Service Manual and replace any defective components.
Proceed to Step # 2 only if diagnostic checks uncover no cause for the customer comments.
MEMCAL CHART:
2. Install a new MEMCAL, which may be obtained from GMSPO (reference the attached service part number chart).
IMPORTANT: The following procedure must be completed when removing and installing a 60 degree V6 Engine Control Module (ECM) MEMCAL. Reference Dealer Service Bullefin No. 89-41-6E, dated December 1988.
a.) Disconnect the battery.
b.) Remove current MEMCAL and install a new service MEMCAL.
c.) Restore the battery power and place air conditioning controls (if equipped) in the
"off" position.
d.) Firmly apply the parking brake and block the drive wheels. Start the engine, and
shift the transaxle to "drive" for automatics or "neutral" for manuals.
e.) Allow the engine to run until the engine cooling fan has cycled once, or a maximum of 10 minutes.
f.) Turn the ignition key to the "off" position for at least 5 seconds.
g.) Start the engine, and shift the transaxle to "drive" for automatics or "neutral" for
manuals.
h.) Allow engine to run for at least 5 minutes.
Parts are currently available from GMSPO.
Labor Operation Number: T1426
Labor Time: .7 Hours