Bulletin Number: 89-6-65 Reference Number:
Publish Date:    936516R 8/89
Subject:    MULTIPLE DRIVEABILITY CONCERNS, FOR 2.5L ENGINE (INSTALLATION OF NEW PROM)

Models

Affected:   1987-89 6000, GRAND AM AND FIERO
This bulletin contains new and revised calibrations to address additional driveability conditions.

Some 1987-89 6000 and Grand Am and 1987-88 Fiero models may exhibit one or more of the following driveability
conditions:

    1.   Hard Hot Engine Restart
    2.   Intermittent 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 for the following car lines:
  A       N      P

1.6 Hr. 1.7Hr. 1.4Hr.

Pontiac Table 1 -- TABLE 1

                                                                    (*)
VEHICLE CONFIGURATION                                         REQUIRED PARTS

                           CUR.
                           PROM   NEW PROM      NEW      PROM      FUEL         FUEL
                           I.D.      PKG.       PROM     I.D.      SENDER       Pump
M/Y              TRANS     (SCAN)    P/N        LABEL    (SCAN)    P/N          P/N

87 6000          AUTO      2692   16143575      ATBX     3541      25093744     25115764
87 6000          AUTO      2772   16143575      ATBX     3541      25093744     25115764
87 6000          AUTO      9512   16143575      ATBX     3541      25093744     25115764
88 6000          AUTO      2712   16143545      ATBM     3461      25093744     25115764
88 6000          AUTO      6372   16143545      ATBM     3461      25093744     25115764

87 GRAND AM      AUTO      1272   16143457      ATBU     3521      25092778     25115925
87 GRAND AM      AUTO      9532   16143457      ATBU     3521      25092778     25115925
87 GRAND AM      MAN       1282   16143452      ATBR     3491      25092778     25115925
87 GRAND AM      MAN       9542   16143452      ATBR     3491      25092778     25115925

87-88 FIERO      AUTO      2672   16143570      ATBW     3531      25093526     25115764
87-88 FIERO      AUTO      6032   16143570      ATBW     3531      25093526     25115764
87-88 FIERO      AUTO      9552   16143570      ATBW     3531      25093526     25115764
87-88 FIERO      MAN       2682   16143455      ATBT     3511      25093526     25115764
87-88 FIERO      MAN       9562   16143455      ATBT     3511      25093526     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).

Pontiac Table 2 -- 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)

6000           87        AUTO     1212          16143575    ATBX      3541
6000           87        AUTO     2692          16143460    ATCB      3581
6000           87        AUTO     2772          16143460    ATCB      3581
6000           87        AUTO     5392          16143575    ATBX      3541
6000           87        AUTO     9512          16143460    ATCB      3581

6000           88        AUTO     2712          16143465    ATBN      3471
6000           88        AUTO     6372          16143465    ATBN      3471
6000           88-89     AUTO     1532          16143545    ATBM      3461
6000           88-89     AUTO     5132          16143545    ATBM      3461
6000           88-89     AUTO     5932          16143545    ATBM      3461

GRAND AM       87        AUTO     1272          16143466    ATBP      3481
GRAND AM       87        AUTO     9532          16143466    ATBP      3481
GRAND AM       87        MAN      1282          16143463    ATBL      3451
GRAND AM       87        MAN      9542          16143463    ATBL      3451
GRAND AM       87-88     AUTO     1232          16143457    ATBU      3521
GRAND AM       87-88     AUTO     6402          16143457    ATBU      3521
GRAND AM       87-88     MAN      1242          16143452    ATBR      3491
GRAND AM       87-88     MAN      6412          16143452    ATBR      3491

FIERO          87-88     AUTO     1512          16143570    ATBW      3531
FIERO          87-88     AUTO     2672          16143459    ATCA      3571
FIERO          87-88     AUTO     5372          16143570    ATBW      3531
FIERO          87-88     AUTO     6032          16143459    ATCA      3571
FIERO          87-88     AUTO     9552          16143459    ATCA      3571
FIERO          87-88     MAN      1522          16143455    ATBT      3511
FIERO          87-88     MAN      2682          16143453    ATBS      3501
FIERO          87-88     MAN      5382          16143455    ATBT      3511
FIERO          87-88     MAN      9562          16143453    ATBS      3501