Engine - Cold Stall/Chuggle At 35-40 MPH
Bulletin: 91-6E-21ADate: July '92
Ref.No.: 91-303-6E
Corp.Ref.No.: 106503R
SUBJECT:
COLD START CHUGGLE AT 35-45 MPH WITH TORQUE CONVERTER CLUTCH ENGAGED REVISED CALIBRATION MEM-CALS
MODELS AFFECTED:
1989-90 PARK AVENUE/ULTRA AND RIVIERA/REATTA
1989-91 LESABRE
THIS BULLETIN IS REVISED TO INCLUDE THE 1989-90 RIVIERA/REATTA MODELS.
Some owners of 1989 through 1990 Park Avenue/Ultra and Riviera/Reatta models and 1989-91 LeSabre models equipped with the 3800 (Code C) Engine may experience one or both of the following conditions:
^ Engine does not stay running on initial cold start.
^ Chuggle at 35-45 mph with torque converter clutch engaged.
The two conditions are independent of each other, yet it may be possible for both conditions to exist on one vehicle.
Follow the information outlined under the individual heading for that condition:
ENGINE DOES NOT STAY RUNNING ON INITIAL COLD START
If the vehicle's basic engine controls and fuel systems are operating properly, it is important for the technician to familiarize themselves with information contained in Service Bulletin Number 006504 (Buick number 91-6E-3) "Recommended fuels for non-turbo port fuel injection engines". If the condition cannot be repaired by changing fuel or using currently published service and diagnostic procedures, it may be necessary to install a revised calibration MEM-CAL. Install MEM-CALS listed in Table A for this condition only.
CHUGGLE AT 35-45 MPH WITH TORQUE CONVERTER CLUTCH ENGAGED
Proceed with the diagnostic flow chart (Figure 1) to aid in identifying the possible cause of the condition.
Note:
The new revised calibration MEM-CALS may slightly affect fuel economy (usually less than 1 mile). Be sure to advise the vehicle owner of this fact.
ENGINE DOES NOT STAY RUNNING ON INITIAL COLD START AND CHUGGLE AT 35-45 MPH AND WITH TORQUE CONVERTER CLUTCH ENGAGED
Should owners' comments indicate both conditions exist. Follow steps outlined in both procedures. The two conditions are independent of each other. If it is determined that a new revised calibration MEM-CAL is necessary to correct both conditions, select MEM-CALS listed in Table B.
Note:
The new revised calibration MEM-CALS in Table B may affect fuel economy. Be sure to advise the vehicle owner of this fact.
TABLE "A" COLD STALL ONLY
Note:
Some 1991 LeSabre models with a 2.84 axle ratio and Federal emissions package had a PROM released that used Scanner ID 5644 but had a broadcast code of AWJD. This should not be confused with 16165829 PROM which uses Scanner ID 5644 for a 2.97 axle ratio. DO NOT rely on the Scanner ID to determine which PROM is in a vehicle. Look at the broadcast code on the PROM to be sure.
PARTS STATEMENT:
Parts are expected to be available on July 20, 1992. In case of limited inventory, parts will be placed on 400 control to waive VIP surcharges. Only verifiable emergency VIP orders will be accepted. SPO will make every effort to obtain parts. However, the part will be shipped premium transportation at dealer's expense and all other order types will be placed on backorder until the 400 control is removed.
WARRANTY INFORMATION:
Labor Operations No.:
T0500
Labor Time:
.7 hr. (Replace MEM-CAL)
.2 hr. (Add to complete chuggle Diagnostic Flow Chart only)