PROM - Excessive Black Smoke at Idle
89chevy32Number: 89-181-6E
Section: 6E
Date: June 1989
Subject: MORE THAN NORMAL BLACK SMOKE AT IDLE
Model and Year: 1988-89 C, K, R, V, G TRUCKS WITH 6.2L (VIN C) DIESEL
TO: ALL CHEVROLET DEALERS
Comments have been received of more than normal black smoke at idle on the above mentioned vehicles.
To correct this black smoke condition, the Engine Control Module (ECM) calibration has been modified to enhance the regulation of the Exhaust Gas Recirculation circuit at idle. Listed below are the replacement PROM's required to service the 1988-89 model vehicles.
NEW Replacement
Broadcast Scanner PROM
Code I.D. P/N
Model
1988
APYC Visual
16133376 RN C/K/G ALL MODELS
Inspection
1989
APXY 3381
16133879 R/V 1 AND MD8
G2 AND MY6
APXZ 3391
16141815 C/K 1, 2 AND M20
C1 AND MD8
APYA 3401
16133888 C2 AND MD8
K1, 2 AND MD8 G2 AND MD8
Parts are currently available from GMSPO.
1988 vehicles require visual inspection of the PROM Broadcast label for ECM Identification (I.D.).
Tech I Scan tool may be used to identify ECM calibration on 1989 vehicles.
Current service procedure for PROM replacement should be used.
Labor Operation Number: T0500
Labor Tlme: .6 Hours All trucks except G .7 G trucks