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Discussion Starter #3
Found this tonight
My GTO has a 9/23 TPW
I pulled my plugs and they were double platinums.


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

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.


--------------------------------------------------------------------------------
Document ID# 1396703
2004 Pontiac GTO
 

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How did your car end up with platinum plugs?

I went with the Denso Iridium plugs in both the GTO and SS.

I've seen plugs come out of 5 cars now and they all had the Delco branded iridiums. I've checked the gap on 3 cars and they were all .040-.041. It's pretty easy to tell if they are platinum or iridium by the electrode.
 

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Discussion Starter #5
AmesGTO said:
How did your car end up with platinum plugs?

I went with the Denso Iridium plugs in both the GTO and SS.

I've seen plugs come out of 5 cars now and they all had the Delco branded iridiums. I've checked the gap on 3 cars and they were all .040-.041. It's pretty easy to tell if they are platinum or iridium by the electrode.

Must have just missed the bulletin date.
#03-06-04-060 Information on New Spark Plugs and Gapping - (Oct 24, 2003)
 

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AmesGTO said:
How did your car end up with platinum plugs?

I went with the Denso Iridium plugs in both the GTO and SS.

I've seen plugs come out of 5 cars now and they all had the Delco branded iridiums. I've checked the gap on 3 cars and they were all .040-.041. It's pretty easy to tell if they are platinum or iridium by the electrode.
Why change the plugs if you are already equipted with the Delco Iridiums?
 

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A/C Plugs

Holeshot said:
Found this tonight
My GTO has a 9/23 TPW
I pulled my plugs and they were double platinums.


Information on New Spark Plugs and Gapping #03-06-04-060 - (10/24/2003)
Information on New Spark Plugs and Gapping
2004 Pontiac GTO

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)

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.

--------------------------------------------------------------------------
Document ID# 1396703
2004 Pontiac GTO
Mine came with them.
 

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sxty8goats said:
Why change the plugs if you are already equipted with the Delco Iridiums?
When I got the Denso's everyone I talked to said the GTO had Platinum plugs. Denso's are not plugs you can just buy anywhere or return easy. So when I pulled the plugs on the GTO and realized they were iridium I said screw it and put the Denso's in anyway. From what I've read the Denso's are a little better plug.

I gave my dad the Delco Iridiums for his truck.

Then I got my SS and it had platinum plugs so at that point I had to buy Iridiums again so I went the Denso route.
 

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Denso Iridiums are better than the NGK Iridiums. The proper part # for LS1 and LS6 vehicles is the Denso Iridium IT16 (stock heat range). An IT20 would be one step cooler.

The Denso is the plug of choice for Lightning and Cobra owners.

http://www.runninwiththedevil.com/denso.htm

Sincerely,

James
 

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Holy zombie thread. Oldest zombie thread Ive seen.
 
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