PROM - Hard Hot Restart/High Idle/Spark Knock/Code 42

9218chevy01

Number: 89-239-6E

Section: 6E

Date: September 1989

Corporate Bulletin No.: 936516


Subject:
MULTIPLE DRIVEABILITY CONCERNS


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


TO:
ALL CHEVROLET DEALERS

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. 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 corroded.


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





Table 2