Riviera V6-231 3.8L VIN C SFI (1989)
Idle Speed/Throttle Actuator - Electronic: All Technical Service Bulletins
Engine - Decel Stall or Long Crank on Start-Up
Bulletin:
93-6E-3
Date:
Oct.'92
Ref.No.:
93-6-6E
Corp.Ref.No.:
206504
SUBJECT:
NEW IDLE AIR CONTROL (IAC) MOTOR FOR 3800 AND 3300 ENGINES
MODELS AFFECTED:
1988-90 ELECTRA/PARK AVENUE, RIVIERA/REATTA AND LESABRES EQUIPPED WITH 3800 (VIN C) ENGINE
1991 LESABRES EQUIPPED WITH 3800 (VIN C) ENGINE
1989-93 CENTURY AND SKYLARK MODELS EQUIPPED WITH 3300 (VIN N) ENGINE
1990-93 PARK AVENUE, LESABRE, RIVIERA/REATTA AND REGAL MODELS EQUIPPED WITH 3800 (VIN L) ENGINE
1991-93 PARK AVENUE/ULTRA MODELS EQUIPPED WITH 3800 S/C (VIN 1) ENGINE
Some of the models mentioned above may experience a decel stall or long crank on startup. This condition can sometimes be viewed on a scan tool as
excessively high IAC counts at idle immediately after startup, or as a failure to return to the same (or similar) IAC counts displayed at idle after several
throttle maneuvers.
If this condition is experienced and currently published service diagnostic procedures indicate a malfunctioning IAC motor, it will be necessary to install
a new IAC motor.
It should be noted that two designs of IAC motors exist. The 3800 (VIN L) and the 3800 supercharger (VIN 1) use a triple slope design (see figure). The
3800 (VIN C) and 3300 (VIN N) use a dual slope design. The dual slope and the triple slope designs are not interchangeable. Several part numbers for
IAC motors are being phased out to standardize usage and are being replaced by current production IAC motors. The chart below lists the application
