Grand Prix V6-191 3.1L (1989)
PROM - Programmable Read Only Memory: All Technical Service Bulletins
PROM - Cold Start or Decel Stall or Tip-in Hesitation
Bulletin Number:
89-6-60
Reference Number:
936515
Publish Date:
7/89
Subject:
DRIVEABILITY CONCERNS - 3.1L V-6 ENGINE (DIAGNOSIS AND NEW MEM-CALS)
Models
Affected:
1989 GRAND PRIX
Some customers with an engine/vehicle combination listed above may comment that they have experienced one or more of the following conditions:
A cold start stall or sag, A decel stall, or A tip-in hesitation
These conditions may be attributed to a number of components/interactions. In the interest of simplifying diagnosis and repair, the following procedure
has been developed to reduce system sensitivity, thereby addressing a variety of potential causes simultaneously.
If a customer comment concerning an occasional engine stall or a drive hesitation is received, then complete the following procedure:
1.
Perform diagnostic checks, per Section 6E3 of the Service Manual and replace any defective components.
Proceed to Step # 2 only if diagnostic checks uncover no cause for the customer comments.
2.
Check the MEM-CAL scanner I.D. to determine if latest MEM-CAL is installed. If not, proceed to Step # 3. If so, the vehicle must be reinspected
for other possible causes for the problem.
3.
Install a new MEM-CAL into the Engine Control Module (ECM) per instructions below. The new MEM-CAL may be ordered from GMSPO. See
the attached service part number chart.
A)
Pull the underhood ECM continuous power fuse or disconnect the battery and leave it disconnected for at least 10 minutes.
B)
Remove current MEM-CAL and install a new service MEM-CAL.
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.
Use Labor Operation Number:
T1506
Labor Time
: .7 Hour
1989 GRAND PRIX MODELS WITH 3.1L ENGINE MEM-CAL SELECTION CHART - SERVICE PART
NUMBERS
BROAD-
MODEL
MODEL
EMISSION
MEM-CAL
SCANNER
CAST
YEARS
TYPE
TRANS.
CONFIG.
P/N
I.D.
CODE
1989
GRAND PRIX AUTO
4-SPEED
FED
16138522
8461
ARZW
1989
GRAND PRIX AUTO
4-SPEED
CAL
16134660
4721
ARCX
Parts are currently available from GMSPO.