Calais V6-3300 3.3L MFI VIN N (1990)
Spark Plug: All Technical Service Bulletins
Engine - Miss at Idle or Highway Speeds
SUBJECT
ENGINE MISS AT IDLE AND OR AT HIGHWAY SPEED
(INSPECT, INSTALL NEW SPARK PLUGS)
MODELS/YEARS
1989-90 CUTLASS CALAIS AND CUTLASS CIERA
MODELS WITH 3300 (VIN N) ENGINE
NUMBER:
90-T-174
CORP.REF.NO: 006503
DATE:
November 1990
SECTION:
6D4
Some 1989-1990 Cutlass Calais and Cutlass Ciera models equipped with a 3300 engine (VIN N), may experience a condition described as an engine
miss at idle and or at highway speed.
Figure 1
If these conditions are experienced on a vehicle, technicians should inspect all spark plugs for a broken insulator, (see the illustration below). The
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. Beginning at the start of production, 1991 vehicles with the 3300 (VIN N) engine come
equipped with the new R45LTS6 spark plugs.
NOTE:
Spark plugs must be replaced as a set, do not mix spark plugs.
Parts are currently available from GMSPO.