Skyhawk L4-121 2.0L Turbo VIN M FI (1987)
Spark Plug: All Technical Service Bulletins
Spark Plug - Revised Recommendation
Bulletin:
87-6E-26
Date:
Feb. '88
Ref. No.: 88-077-6E
Corp. Ref. No.: 836504
SUBJECT:
REVISED SPARK PLUG RECOMMENDATION FOR PLUG FOULING PREVENTION
MODELS AFFECTED: 1987 SKYHAWKS WITH THE 2.0L L-4 ENGINE (VIN CODE 1)
Incidents of plug fouling in cold climates (below freezing) on 1987 Skyhawks with L-4 (VIN Code 1) engines can occur with short-hop cold engine
driving schedules. A hotter heat range spark plug (type "R44LTSM" with a .035" gap) will lessen or eliminate the plug fouling condition.
The new plug is available from GMSPO in either a 4-pack, Part Number 5614156 or an 8-pack, Part Number 5614155.
Spark plug "R44LTSM" is a copper core tapered-seat spark plug and replaces the original gasketed spark plug. The aluminum cylinder head machining
will allow either spark plug seat configuration to be installed.
First installation torque of the tapered seat spark plug is 18-22 ft.lbs. (24-30 N-m.). Subsequent installation torque for new or old spark plugs is 7-15
ft.lbs. (10-20 N-m.).
This bulletin is for information only.
