Riviera V6-231 3.8L VIN C SFI (1989)
PROM - Programmable Read Only Memory: Customer Interest
Engine - Cold Stall/Chuggle At 35-40 MPH
Bulletin: 91-6E-21A
Date: 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:
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Engine does not stay running on initial cold start.
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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
