Spark Plug - Revised Recommendations

Number: 87-47

Section: 6D

Date: DEC., 1986
Subject: REVISED SPARK PLUG RECOMMENDATION FOR PREVENTION OF PLUG FOULING


Model and Year: 1987 PASSENGER CARS EQUIPPED WITH 4.3L V-6 (VIN CODE Z), 5.0L V-8 (VIN CODE H OR G) AND 5.7L V-8 (VIN CODE 6)


TO: ALL CHEVROLET DEALERS


Incidents of spark plug fouling on early 1987 passenger vehicles equipped with 90 degree V6 and V8 engines and R43TS spark plugs can be corrected by the installation of a higher heat range spark plug. The new plug is a type R45TS equipped with a copper core, P/N 5613957.

A copper core spark plug can be identified by a "dot" after the "AC" logo on the porcelain portion of the plug.
(Example: AC.R45TS). Every effort should be made to insure that the plugs to be installed are copper core type.

The following carline/engine combinations are affected:

CARLINE ENGINE

Caprice/Monte Carlo LB4 4.3L EFI
LG4 5.0L Carb.
L69 5.0L Carb.
LM1 5.7L Carb.

Camaro LG4 5.0L Carb.