C 1500 Truck 2WD V8-5.3L VIN T (1999)
Spark Plug: Technical Service Bulletins
Ignition - Denso & AC Spark Plug Usage
File In Section: 06 - Engine/Propulsion System
Bulletin No.: 99-06-04-021
Date: June 1999
INFORMATION
Subject:
Denso and AC Spark Plug Usage
Models:
1999-2000 Chevrolet and GMC C/K Models (Silverado and Sierra) with 5.3 L V8 Engine (VIN T - RPO LM7)
Condition
Two different spark plugs are used In late 1999 and all 2000 model year pick-up trucks identified above.
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Vehicles built at the Oshawa assembly plant (RPO OSG, VIN Plant code 1) will use Denso spark plugs (type PTJ16R15).
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Vehicles built at Ft. Wayne (VIN Plant code Z) and Pontiac East (VIN Plant code E) assembly plants will use AC spark plugs (type AC 41-952).
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Both Denso and AC spark plugs are completely interchangeable and may be Inter-mixed.
Service Information
1999 and 2000 Owners Manuals will list the AC spark plug for service. Either spark plug may be used for replacement.
Parts Information
GMSPO will provide either the AC or Denso spark plug for service. Check the GMSPO catalog for the correct spark plug part number.
