Hey guys, just replaced the original platinum tip plugs on my 6.0 liter with the iridium plugs. The new plugs are pregapped at .040", but the sticker under the hood says to gap the plugs in ~ .060". The guy at the dealer said to leave the plugs in ~ .040", it will run fine and will also run a little cooler. So for now I left them at .040", and it runs good. Should I take them back out and set them at .060", or leave them? If I leave it will that decrease gas mileage you think?




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Bish

Senior Enthusiast
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Member 61,704 postsLocation:Chicagoland
Hey guys, just replaced the original platinum tip plugs on my 6.0 liter with the iridium plugs. The new plugs are pregapped at .040", but the sticker under the hood says to gap the plugs in ~ .060". The guy at the dealer said to leave the plugs at .040", it will run fine and will also run a little cooler. So for now I left them at .040", and it runs good. Should I take them back out and set them in ~ .060", or leave them? If I leave it will that decrease gas mileage you think?

 



rjirvine

Enthusiast
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Member 0646 posts
Hey guys, just replaced the original platinum tip plugs on my 6.0 liter with the iridium plugs. The new plugs are pregapped in ~ .040", but the sticker under the hood says to gap the plugs in ~ .060". The guy at the dealer said to leave the plugs in ~ .040", it will run fine and will also run a little cooler. So for now I left them in ~ .040", and it runs good. Should I take them back out and set them at .060", or leave them? If I leave it will that decrease gas mileage you think?

 


 

 

 

 

I replaced my plugs at 93k from platinums to iridiums. You're correct, the gap went native .060 to .040. I checked them before I installed them just to make sure, and they were all correct. I didn't notice any difference, and it idles smooth.


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MS3DALE

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Moderator 138  414,968 postsName:RichLocation:Carmichaels,Pa.Gender:MaleDrives:'15 Silverado Z71 '11 Camaro SS '18 Cruze

This should help,

 

Document ID# 1396703

 

 

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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

 

 

 

 

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