S10/T10 P/U 2WD V6-262 4.3L (1988)
Spark Plug: Technical Service Bulletins
Ignition System - Spark Plug Usage Change
GMC NUMBER:
88-T-64
GROUP:
6D - Engine Electrical
DATE:
December, 1987
CORPORATE
NUMBER:
836402R
SUBJECT:
SPARK PLUG USAGE CHANGE
MODELS:
1988 LIGHT DUTY TRUCKS WITH 4.3L, 5.0L AND 5.7L ENGINES (VIN CODES Z, H AND K)
This bulletin is to advise dealers that there has been a spark plug usage change in production for 1988 trucks with the 4.3L, 5.0L and 5.7L engines.
Engines built through August 30, 1987, have spark plugs AC CR43TS, P/N 5614029. Engines built starting August 31, 1987, have spark plugs AC
R43TS, P/N 5613325. Due to design differences between the CR43TS and R43TS spark plugs, a radio popping noise may be encountered in vehicles
equipped with CR43TS spark plugs. This condition can be repaired by replacing CR43TS spark plugs with R43TS spark plugs. Spark plug gap is
0.035".
