Service Bulletin?

[Z71sierra7787]

I was at the dealership and just asked about spark plugs because ive been procrastinating changing them and he said the new ones gm recommends are the delco iradiums gaped a .040, this seems normal but under the hood it says .060, he had the right year truck and everything and even at parts stores it says .060, i dont doubt that they changed it to .040 but im just wondereing why, to take care of pinging or spark knock maybe?

[DBYRD]

<div class='quotetop'>QUOTE(Z71sierra7787 &#064; Nov 2 2006, 01&#58;30 PM) [snapback]71966[/snapback]</div>

I was at the dealership and just asked about spark plugs because ive been procrastinating changing them and he said the new ones gm recommends are the delco iradiums gaped a .040, this seems normal but under the hood it says .060, he had the right year truck and everything and even at parts stores it says .060, i dont doubt that they changed it to .040 but im just wondereing why, to take care of pinging or spark knock maybe?
[/b]

could have to do with it being iradiums. if i remember correctly someone has already posted bout iradiums, and seemed as if they were gapped different. check gabe&#39;s post about it prob bout a month ago.

[FLATOP08]

We sell AC delco at the parts store where I work and it has a footnote saying the new gap is .040 and not to gap to .060

[Z71sierra7787]

<div class='quotetop'>QUOTE(Allstar55566 &#064; Nov 2 2006, 04&#58;15 PM) [snapback]71976[/snapback]</div>

could have to do with it being iradiums. if i remember correctly someone has already posted bout iradiums, and seemed as if they were gapped different. check gabe&#39;s post about it prob bout a month ago.
[/b]

Awesome, thanks for the info, it makes me feel more comfortable about it

[hummertech]

this is the bullitan you were talking about.


Document ID# 1396703
2003 HUMMER H2


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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.


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Document ID# 1396703
2003 HUMMER H2

[Z71sierra7787]

Theres not much more to say about you besides youd be god if you could get em for less than 9 a piece haha, but thanks for the info youve helped me more than once and i appriciate the inside knowledge and if you or anyone knows the p/n thatd be great so i could look around for them

[RedHeartbeat]

watch ebay, they show up on there quite often. better yet, follow my linky and buy this set for &#036;37 shipped for 8 of them.

http://cgi.ebay.com/ebaymotors/41-985-AC-D...sspagenameZWD1V

am i god now?

[Z71sierra7787]

no worries you are pretty close too haha