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GMC Forum: best spark plug
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  #1  
Old 12-09-2011, 01:47 PM
gmc man gmc man is offline
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Default best spark plug

I have a 2004 GMC 3500 cab/chassis/dump with the 6.0 motor with 39,000 miles.The truck has performed nearly perfectly and is spotless clean.Even though the "recommended" is 100,000 mi.I feel it is time to change the plugs.Snow plowing/age of truck has me a bit Leary to wait any longer.

My question is...do I use AC (stock) plugs or go with the platinum or similar type plugs? What brand is best?
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  #2  
Old 12-09-2011, 01:56 PM
Molson02536 Molson02536 is offline
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Quote:
Originally Posted by gmc man View Post
I have a 2004 GMC 3500 cab/chassis/dump with the 6.0 motor with 39,000 miles.The truck has performed nearly perfectly and is spotless clean.Even though the "recommended" is 100,000 mi.I feel it is time to change the plugs.Snow plowing/age of truck has me a bit Leary to wait any longer.

My question is...do I use AC (stock) plugs or go with the platinum or similar type plugs? What brand is best?
The stock AC Delco Platinum Plugs, that are in there now. You never had issues with them this long, why change to a different brand now???

Molson02536
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  #3  
Old 12-09-2011, 02:02 PM
gmc man gmc man is offline
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I was not aware that they used platinum plugs in 2004;I just through it out there to see if there were any superior plug to factory.Stock parts are not always the best!
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Old 12-09-2011, 05:26 PM
Z15 Z15 is offline
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Actually they were using Iridium's by 2004 as Platinum was being phased out in production vehicles. I know for a fact my 2004 Sierra PU with 5.3L engine come with Iridium's and there was a service bulletin out that said to replace platinum plugs in prior models with the new Iridium's.

Stick with the AC Delco's and avoid the gimmick spark plugs.
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  #5  
Old 12-09-2011, 08:26 PM
gmc man gmc man is offline
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Quote:
Originally Posted by Z15 View Post
Actually they were using Iridium's by 2004 as Platinum was being phased out in production vehicles. I know for a fact my 2004 Sierra PU with 5.3L engine come with Iridium's and there was a service bulletin out that said to replace platinum plugs in prior models with the new Iridium's.

Stick with the AC Delco's and avoid the gimmick spark plugs.
Good info...sure sounds to me A/C all the way!
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  #6  
Old 12-10-2011, 12:22 PM
Z15 Z15 is offline
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fyi..........................

Quote:
Spark Plug: Technical Service Bulletins Ignition System - New Spark Plug Type/Gapping
Bulletin No.: 03-06-04-060
Date: October 24, 2003
INFORMATION
Subject:
Information on New Spark Plugs and Gapping
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 CMC Sierra
2000-2004 CMC Yukon, Yukon XL
2001-2004 CMC Yukon Denali, Yukon XL Denali
2002-2004 CMC Sierra Denali
2003-2004 CMC 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, LSI, 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 1.01 mm (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.
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  #7  
Old 12-10-2011, 02:31 PM
gmc man gmc man is offline
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Quote:
Originally Posted by Z15 View Post
fyi..........................
Great and very important info....thank you!
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