Skylark V6-204 3.3L VIN N FI (1989)
Spark Plug: All Technical Service Bulletins
Engine - Miss at Idle/Highway Speeds
Bulletin 90-6E-16
Date Oct. '90
Ref. No. 90-184-6E
Corp. Ref. No. 006503R
SUBJECT:
ENGINE MISS AT IDLE AND/OR AT HIGHWAY SPEED
MODELS AFFECTED:
1989 - 90 CENTURY WITH 3300 (VIN N) 1989 - 90 SKYLARK WITH 3300 (VIN N)
Fig. 1
Some 1989 - 90 Century and Skylark models equipped with a 3300 engine (VIN N), may experience a condition described as an engine miss at idle and
or at highway speed.
If these conditions are experienced on a vehicle, technicians should inspect all spark plugs for a broken insulator, (Figure 1). Condition occurs most often
on cylinders 2, 4 or 6. Should a technician find a broken insulator on any cylinder, it is recommended that all spark plugs be replaced with a new
replacement spark plug R45LTS6, Service Package Number 5614224. This Service Package will also serve as the new service replacement spark plug
for the 1989-1990 3300 (VIN N) engine, S.O.P. 1991 vehicles were changed to the new spark plug, R45LTS6.
Note:
Spark plugs must be replaced as a set, do not mix spark plugs.
Parts are expected to be available on October 10, 1990. Until then, normal part orders will not be accepted by GMSPO. Only verifiable emergency VIP
orders will be accepted. GMSPO will make every effort to obtain parts. All parts will be placed on 400 control to waive VIP surcharges. However, the
part will be shipped premium transportation at dealer's expense. All other order types will be canceled as incorrectly ordered while the 400 control is in
place.
