DeVille V8-4.6L VIN 9 (1995)
Spark Plug Wire: Technical Service Bulletins
Ignition - New Spark Plugs, Spark Plug Wires, and Boots
File In Section: 6 - Engine
Bulletin No.: 47-61-45A
Date: January, 1995
Subject:
New Spark Plugs, Spark Plug Wires and Boots
Models:
1995 Cadillac Eldorado, Seville, Concours
with 4.6L Engine (VINs 9, Y - RPOs L37, LD8)
1995 Oldsmobile Aurora
with 4.0L Engine (VIN C - RPO L47)
This bulletin is being revised to designate 1995 model year usage only for the spark plug wires part numbers contained in this bulletin and correct the
description usage of the spark plug part numbers. Please discard bulletin number 47-61-45 (Section 6 - Engine).
New design spark plugs and spark plug wires and boots went into production on 4.6L Northstar and 4.0L Aurora engines in the 1995 model year.
Features of these new spark plugs and wires are:
1.
The spark plugs are identified with the Code AC-929 and have a "ribless" porcelain insulator.
2.
This "ribless" insulator and boot design provide a better plug-to-boot retention.
3.
This new AC-929 spark plug and boot design significantly reduces carbon tracking and reduces engine misfire.
These new spark plugs may be used interchangeably with the previous design AC-900 spark plugs on any model year 4.0L and 4.6L engine. These new
spark plug wires cannot be used on 1993 and 1994 Model Year vehicles due to differences in spark plug wire lengths.
The spark plug wire boots contain FHC grease as a lubricant, which will last the entire life of the spark plug wire. If silicone type lubricants are added to
FHC coated spark plug boots, carbon tracking of spark plugs may occur.
When ordering these new spark plug wires and spark plugs, refer to the following part numbers:
P/N
Description
12096450
Spark Plug Wire Set G Car
12173402
Spark Plug Wire Set E, K
25161678
AC 929 Spark Plugs
Parts are currently available from GMSPO. Refer to the service procedures outlined in the appropriate Service Information Manual when replacement of
the above mentioned components is necessary.
