Exhaust - Blue/White Smoke From Tailpipe
87chevy10GMC NUMBER: 87-T-59
GROUP: 6E - Engine Emission
DATE: June, 1987
CORPORATE
NUMBER: 736012
SUBJECT: BLUE/WHITE SMOKE FROM TAILPIPE
MODELS: 1986 AND 1987 S/T TRUCKS WITH 2.8L V6 ENGINE (VIN CODE R) AND FEDERAL EMISSIONS
THIS BULLETIN CANCELS AND SUPERSEDES TRUCK SERVICE BULLETIN 86-T-131 (GROUP 6F) DATED JANUARY, 1987, ALL COPIES OF WHICH SHOULD BE DESTROYED.
Some 1986 and 1987 S/T trucks with 2.8L V6 engines and Federal Emissions may exhibit a blue/white smoke from the tailpipe after an extended idle. To repair this condition, check the truck for loss of coolant or excessive use of oil and repair if necessary. If engine checks O.K. (no oil or coolant loss), replace the PROM, using the following chart for application and part numbers. Use the service procedure in Section 6E-Engine Emissions and Driveability of the appropriate service manual.
Service PROM Application *
Model Service
Year Model Transmission Axle PROM
86/87 S/T M4 All 1228541
86/87 S/T M5 3.73 1228542
3.42
86/87 S/T M5 4.11 1228543
86/87 S A4 AH 1228544
86 T A4 3.73 1228545
87 T A4 3.73 1228544
86/87 T A4 4.11 1228545
* 2.8L 1986/87 Federal Emissions applications only. Use applicable labor time and operation numbers.