Engine - Poor Cold/Warm Driveability

91pontiac03

Bulletin Number: 91-6-39
Reference Number: 136509
Publish Date: 5/91


Subject: COLD/WARM ENGINE DRIVEABILITY CHANGES (INSTALL NEW MEMCAL)

Models

Affected: 1990-91 LE MANS WITH 1.6L


A production running change was made to release a new ECM (Electronic Control Module) to address Cold/Warm Engine Driveability Conditions. If a customer conunents about these conditions and the vehicle was built prior to the following VIN breakpoints the conditions may be corrected with a new service calibration Memcal available from GMSPO according to the chart below:

Installation of the new Memcal should be according to the service procedure in the 1991 LeMans Service Manual.

OLD NEW
TRANS OLD ECM B.C. NEW ECM B.C. NEW MEMCAL SCANNER VIN
EMIS. P/N CODE P/N CODE P/N ID B/P

M/T 16139549 ASFL 16159509 AXCC 16160757 9509 MB319634
FEDERAL

A/T 16139539 ASFK 16159529 AXCF 16160767 9529 MB317305
FEDERAL

A/T 16139559 ASFM 16160739 AXJL 16160882 0739 MB322908
CALIFORNIA

M/T 16134189 ARAW 16159519 AXCD 16160762 9519 MB322907
CALIFORNIA


Parts are expected to be available on May 27, 1991. Until then, normal part orders will not be accepted by GMSPO. Only verifiable emergency VIP orders will be accepted. SPO will make every effort to obtain parts. All parts will be placed on 400 control to waive VIP surcharges. However, the part will be shipped premium transportation at dealer's expense. All other order types will be cancelled as incorrectly ordered while the 400 control is in place.

Labor Operation Number : J 6364
Labor Time : 0.7 Hours