Engine - Decel Stall or Long Crank On Start-Up

Number: 93-16A-6E
Section: 6E
Date: OCT. 1992
Corporate Bulletin No.: 206504
ASE No.: A1, A8

Subject:
DECEL STALL/CRANK ON STARTUP

Model and Year:
1992-93 LUMINA APV WITH 3800 ENGINE

THIS BULLETIN CANCELS AND SUPERSEDES DEALER SERVICE BULLETIN NO. 93-16-6E, DATED OCT. 1992. THE ART WORK HAS BEEN CORRECTED. ALL COPIES OF 93-16-6E SHOULD BE DISCARDED.

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 and appropriate service part number.

Parts are currently available from GMSPO.

ENGINE IAC SERVICE
YEAR SERIES ENGINE/RPO VIN CODE PART NUMBER

1992-93 U body 3800/L27 "L" 17112649

Part numbers are for Reference Only.
Check with your Parts Department for latest information.

Use applicable Labor Operation and Time.