2500hd Gas Spark Plugs

[brad_ruch]

was wondering what type of plugs you guys use.I want to change mine.I don't think they ever been done at its got 133,000 on it.I was going to get the AC-Deloco Iridiums @ 6.99ea thanks

[Stevens03]

AcDelco The first set made 133000 miles, why would you want anything else?

[dlstewart01]

This bullitan has been expanded to cover later years as well....

 

Subject: Information on New Spark Plugs and Gapping #03-06-04-060 - (10/24/2003)

 

 

 

Models: 2004 Buick Ranier

 

2002-2004 Cadillac Escalade, Escalade EXT

 

2003-2004 Cadillac Escalade ESV

 

2004 Cadillac CTS-V

 

1997-2004 Chevrolet Corvette

 

1998-2002 Chevrolet Camaro

 

1999-2004 Chevrolet Silverado

 

2000-2004 Chevrolet Suburban, Tahoe

 

2002-2004 Chevrolet Avalanche

 

2003-2004 Chevrolet Express, TrailBlazer

 

1999-2004 GMC Sierra

 

2000-2004 GMC Yukon, Yukon XL

 

2001-2004 GMC Yukon Denali, Yukon XL Denali

 

2002-2004 GMC Sierra Denali

 

2003-2004 GMC Envoy XL

 

1998-2002 Pontiac Firebird

 

2004 Pontiac GTO

 

2003-2004 Hummer H2

 

with 4.8L, 5.3L, 5.7L or 6.0L V-8 Engine (VINs V, P, T, Z, G, S, N, U -- RPOs LR4, LM4, LM7, L59, LS1, LS6, LQ9, LQ4)

 

 

 

 

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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 12571164 with AC Delco P/N 41-985, is gapped to 1.01mm (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 to not be properly gapped should not be used.

 

 

 

GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.

WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION

 

 

© Copyright General Motors Corporation. All Rights Reserved

[brad_ruch]

man you guys are FAST!! thanks!!!!

[ColoradoSkiCountry]

you WILL replace the wires too, right?

[brad_ruch]

should I??I guess it makes sence. what wires you guys use??AC-delco??

[brad_ruch]

what kind of wires should I use??thanks

[grose67]

AC Delco or NAPA wires.

[brad_ruch]

is there somewhere I can look up the part number for the AC Delco wires??

[brad_ruch]

well from what I found on rockauto.com i need to find out what number is on my coil.they list several different sets.

[brad_ruch]

how about the bosch premium wires??

[XFinalresortX]

I use the 8.5mm MSD ignition wire they are pretty good.