EXPERTEC TSB (93-16A-6E)

EXPERTEC TSB

TECHNICAL SERVICE BULLETIN

DECEL STALL/CRANK ON START UP - (NEW IAC MOTOR)

Model(s): 1992-93 Lumina APV with 3800 Engine

Bulletin No.: Chevrolet 93-16A-6E

Date: 10/01/1992

BULLETIN ILLUSTRATION LIST

SERVICE INFORMATION

THIS BULLETIN CANCELS AND SUPERSEDES DEALER SERVICE BULLETIN NO. 93-l6-6E, DATED OCT. 1992. THE ART WORK HAS BEEN CORRECTED. ALL COPIES OF 93-l6-6E 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.

PARTS INFORMATION

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.

Year	Series	Engine/RPO	Engine VIN Code	IAC Service Part Number
1992-93	U body	3800/L27	"L"	17112649

WARRANTY INFORMATION

Use applicable Labor Operation and Time.