MULTIPLE DRIVEABILITY CONCERNS FOR 2.5L ENGINE

Model and Year: 1987-89 A CARS WITH 2.5L ENGINES

THIS BULLETIN CANCELS AND SUPERSEDES DEALER SERVICE BULLETIN NO. 88-200-6E, DATED APRIL 1988. IT CONTAINS NEW AND REVISED CALIBRATIONS TO ADDRESS ADDITIONAL DRIVEABILITY CONDITIONS. ALL COPIES OF DEALER SERVICE BULLETIN NO. 88-200-6E SHOULD BE DISCARDED.

Some 1987-89 A cars may exhibit one or more of the following driveability conditions:

1. Hard Hot Engine Restart 2. Intermiftent Higher Than "Normal" Idle 3. Spark Knock (Detonation) 4. Code 42

If these conditions cannot be addressed through normal service procedures, they may be repaired by installing the appropriate hardware as outlined below.

SERVICE PROCEDURE:

1) Use a scanner to determine the PROM I.D. that is currently in the vehicle.

2) Look for that PROM I.D. in Table 1 or Table 2 as indicated below, and select the corresponding required parts:

If the major condition is hard hot engine restart, use Table 1.

If hard hot engine restart is not the major problem, but the condition is intermittent high idle (similar to cold fast idle), spark knock, and/or Code 42, use Table 2.

3) Install the new parts and verify that the driveability conditions have been corrected.

WARRANTY INFORMATION

To repair intermittent Higher Than "Normal" Idle, Spark Knock, and/or Code 42:

Labor Operation Number: T1316

Labor Time: 0.4 Hr.

To repair Hard Hot Engine Restart with or without any of the above driveability conditions:

Labor Operation Number: T1314

Labor Time: 1.6 Hour

Table 1

VEHICLE CONFIGURATION REQUIRED PARTS*

CUR. NEW NEW PROM PROM NEW PROM FUEL FUEL CAR M/Y TRANS I.D. PKG. PROM I. D. SENDER PUMP --- --- ----- (SCAN) P/N LABEL (SCAN) P/N P/N ---- --- ----- ---- --- --- A 87 AUTO 2692 16143575 ATBX 3541 25093744 25115764 A 87 AUTO 2772 16143575 ATBX 3541 25093744 25115764 A 87 AUTO 9512 16143575 ATBX 3541 25093744 25115764 A 88 AUTO 2712 16143545 ATBM 3461 25093744 25115764 A 88 AUTO 6372 16143545 ATBM 3461 25093744 25115764

* Note: In addition to the required parts above, each application in this table also requires the installation of a "rubber bumper" package (P/N 25004553) and a "pulsator" package (P/N 25094266).

Table 2

VEHICLE CONFIGURATION REQUIRED PARTS

CURRENT NEW NEW MODEL PROM I.D. NEW PROM PROM PROM I.D. CARLINE YEAR TRANS (scanner) PKG.P/N LABEL (scanner) -------- ---- ----- --------- -------- ----- ---------- A 87 AUTO 1212 16143575 ATBX 3541 A 87 AUTO 2692 16143460 ATCB 3581 A 87 AUTO 2772 16143460 ATCB 3581 A 87 AUTO 5392 16143575 ATBX 3541 A 87 AUTO 9512 16143460 ATCB 3581 A 88 AUTO 2712 16143465 ATBN 3471 A 88 AUTO 6372 16143465 ATBN 3471 A 88-89 AUTO 1532 16143545 ATBM 3461 A 88-89 AUTO 5132 16143545 ATBM 3461 A 88-89 AUTO 5932 16143545 ATBM 3461

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.