Ascender 2WD V8-5.3L (2004)
Spark Plug: Technical Service Bulletins
Ignition System - New Spark Plugs and Gapping
Information IB05-01-S003
New Spark Plugs and Gapping
Light Duty ASCENDER 2003 Information ENGINE 03/01/05
Light Duty ASCENDER 2004 Information ENGINE 03/01/05
ISSUE DATE: MARCH 2005
Affected Vehicles
2003-2004 Isuzu Ascender (US) with 5.3L V-8 Engine (VIN P).
Service Information
A new spark plug has been released for use in the above vehicles. The new spark plug has an Iridium tip instead of the current Platinum tip. Due to the
different tip design, the gap of the spark plug has also changed. The new spark plug, P/N 8-12571-164-0 with AC Delco P/N 41-985, is gapped to 1.01
mm (0.040 inches) when the spark plug is made. The spark plug gap is set during manufacturing and should not be changed or damage to the spark plug
may result. Any new spark plug found not to be properly gapped should not be used.
Disclaimer
