Prob With Bosch Spark Plugs In A 6.0l

[Kirkathon25]

I have a 2002 GMC Sierra 6.0L with 101k on it and it was runnin kinda rough so i decided to replace the plugs and wires. i got the bosch platinum 4s and bosch wires. Now it runs even rougher and i was just wondering what should be my next plan of action for troubleshooting a P300 code. I know there is like 15 different things it could be with that code but i think my engine just doesnt like the new spark plugs. Any Advice

[txab]

AC Delco plugs with the proper gap is a good place to start

[[email protected]]

There's been a known problem with many engines and bosch's wierd designed plugs. Just don't buy those stupid looking plugs in the first place. You're not going to get any more power out of a bosch plug than say an ac delco plug that's of normal design.

[sc4808]

Before you spend any more money make sure that the spark plug boot snapped all the way on the plugs, sometimes its hard to tell, I had this happen just recently, I had changed plugs and wires and just like you my truck ran pretty rough afterwards, I went back and found that one of the plug wires had not snapped on the plug correctly, once I reseated it the truck ran great.

 

May not be your problem but its worth checking.

[Daryl LBZ]

I know some vehicles like my Camaro don't like any other plugs, wires, or sensors than ACDelco. They said on other forums all the time about how the car just doesn't seem to act right with Bosch 02 sensors or their other products.

[Black02Silverado]

From all the other forum visits, it seems that GM engines only like AC or NGK plugs. It pops up on other forums and on here occasionally people having plug issues when they try a different brand. The E3 seem to be the worst, at least at getting bad press when used.

[Kirkathon25]

and am i supposed to follow the factory gapping or the gap listed on the actual spark plug

[Kirkathon25]

thanks for your help this prob has been pissing me off because of how expensive those plugs were

[dlstewart01]

Document ID# 1396703

 

 

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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

[Wires]

thanks for your help this prob has been pissing me off because of how expensive those plugs were

 

Use the factory gapping. I've had no luck with Bosch plugs. I put a couple of sets in my 5.3L, and it seemed to run fine, but when I pulled them out 10k later, the center electrode was GONE. Nice piece of hard platinum floating in the engine....

 

+1 with the AC delco. They make a decent plug, and with modern engine electronics, there is nothing to gain with an aftermarket plug swap. Just make sure they are gapped per OEM spec and you have the right heat range.

[Kirkathon25]

i just picked up my new ac delco 41-110 im crossin my fingers and hope it fixes the problems and its not the dam bosch wires too