bruiser04 Posted October 5, 2010 Report Share Posted October 5, 2010 i have tr6 plugs that i havent installed yet and i have a random misfire on the stock plugs i dont think im runnin outta feul so i wanna put these in but do i need to gap em first need to know cause im takin to mechanic in an hour...oh yea im boosted to Quote Link to comment Share on other sites More sharing options...
Fireman31 Posted October 5, 2010 Report Share Posted October 5, 2010 What type of plug are they? Copper, Iridium, Platinum? Quote Link to comment Share on other sites More sharing options...
bruiser04 Posted October 5, 2010 Author Report Share Posted October 5, 2010 (edited) What type of plug are they? Copper, Iridium, Platinum? does not say....... part number 4177 Edited October 5, 2010 by bruiser04 (see edit history) Quote Link to comment Share on other sites More sharing options...
Fireman31 Posted October 5, 2010 Report Share Posted October 5, 2010 Copper core plug with a Nickel Alloy tip, gap them to .035 for your application..... Quote Link to comment Share on other sites More sharing options...
bruiser04 Posted October 6, 2010 Author Report Share Posted October 6, 2010 Copper core plug with a Nickel Alloy tip, gap them to .035 for your application..... thank u sir got it runnin good no more weird idle......sorry for being like a frantic little girl i wanted to get her done before i had to drive it to work Quote Link to comment Share on other sites More sharing options...
lgowen343 Posted November 5, 2010 Report Share Posted November 5, 2010 What would the gap be for a AC Delco iridium plug? I set mine at .060. Quote Link to comment Share on other sites More sharing options...
Cramer Posted November 5, 2010 Report Share Posted November 5, 2010 What would the gap be for a AC Delco iridium plug? I set mine at .060. You are not supposed to gap Iridium plugs. They should be gapped at .060 from the factory, but if you try to gap them you can easily break the tip off. Quote Link to comment Share on other sites More sharing options...
12'SROCK Posted November 5, 2010 Report Share Posted November 5, 2010 You are not supposed to gap Iridium plugs. They should be gapped at .060 from the factory, but if you try to gap them you can easily break the tip off. AC Delco Iridium spark plugs (41-985) are gapped to .035". Quote Link to comment Share on other sites More sharing options...
desrtrat Posted November 5, 2010 Report Share Posted November 5, 2010 TSB on plug gap.. 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) -------------------------------------------------------------------------------- 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. Quote Link to comment Share on other sites More sharing options...
Hankg42 Posted November 5, 2010 Report Share Posted November 5, 2010 I always check the gap regardless of whether they are "pre-gapped" or not. Who's to say they left the factory perfect, or if the box was dropped, whatever. Changing the gap is a different story. I like how the TSB states "Any new spark plug found to not be properly gapped should not be used." I wonder if the parts store will exchange a plug not properly gapped? Quote Link to comment Share on other sites More sharing options...
Cramer Posted November 6, 2010 Report Share Posted November 6, 2010 AC Delco Iridium spark plugs (41-985) are gapped to .035". My bad, I was thinking about the NGK plugs I just put in and two had cracked insulators. They are pregapped at .060 and shouldn't be gapped by hand. Quote Link to comment Share on other sites More sharing options...
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