spark plugs
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spark plugs - 10/3/2007 10:02:24 PM
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dizzy
Posts: 271
Joined: 9/26/2006
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Hi all. I am considering changing the plugs on my 2003 H2. It has about 70,000 miles now and I don,t know the previous service history. Does anyone here have any tips to share to make this job alittle easier? My owners manual shows a gap of .060 and I believe the plugs to be iridium. On the sparkplugs.com site they show a selection of iridium plugs for this application with different gaps. They also say not to gap them as they will already be factory gapped and trying to gap them could damage the iridium tips. Any information on spark plug replacement you guys could share would be greatly appreciated. The owners manual lists Denso and Ngk plugs. So, has anyone here changed the plugs on the H2? Thanks in advance guys.
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RE: spark plugs - 10/4/2007 3:53:28 AM
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hilljob26
Posts: 2069
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i am a huge fan of the bosch platinum 4's they come already gapped but are a liottle pricey
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RE: spark plugs - 10/4/2007 4:10:59 PM
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Muddydawg75
Posts: 9960
Joined: 3/11/2007
From: South Jersey Shore
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It never hurts to change them.....
Always check the gap.... they come pregapped.... but your autoparts store might have somebody like HummBob that stocks the shelves and likes to drop them.... ALWAYS check that gap... The gap is written on the sticker under the hood on the radiator support...
Personally I think Bosch +4 is junk.... I change mine one a year and the porcelin used to crack in my Explorer...
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RE: spark plugs - 10/4/2007 4:29:44 PM
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hilljob26
Posts: 2069
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really,man i have used these in everything and never had a problem,you didnt have hummbob install them did you
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RE: spark plugs - 10/4/2007 8:17:21 PM
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dizzy
Posts: 271
Joined: 9/26/2006
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Thanks for the replies guys. My auto parts guy told me they have ac delco iridium plugs and my cost would be $9 each. Doesn,t sound too bad as the dealer is quoting me $15 each. Would you guys just snug them up or torque them? I don,t have a service manual yet to know what they should be torqued at. I would guess about 10ft.lbs? The owners manual shows a gap of .060 Would you guys go by that or what the plug manufacturer says? Thanks again guys
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RE: spark plugs - 10/5/2007 8:53:22 AM
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dizzy
Posts: 271
Joined: 9/26/2006
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Thanks for your help guys! Just one more question before my weekend project. There is a metal jacket of some kind around the plug where the wire connects to it. I am guessing this is some kind of heat shield? Do any of you guys know if this shield comes off to get at the plug? Is this shown in the manual? It looks like you would pull the wire off the plug then possibly remove this heat shield then pull the plug. I have to get a service manual soon. As always thanks in advance for any suggestions.
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RE: spark plugs - 10/5/2007 6:09:14 PM
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Muddydawg75
Posts: 9960
Joined: 3/11/2007
From: South Jersey Shore
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I always use anti seize too.... it's cheap and you will never regret using it....
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"I feel sorry for people who don't drink. When they wake up in the morning, that's as good as they're going to feel all day." --Frank Sinatra
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RE: spark plugs - 10/5/2007 8:16:21 PM
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dizzy
Posts: 271
Joined: 9/26/2006
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Yes, I will use some anti seize on the threads.Glad you reminded me . In regards to the "heat shield" around the plugs. Does anyone know if this just pulls off or does it even have to come off to get the plugs out?
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RE: spark plugs - 10/6/2007 6:59:55 AM
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HUMMER DRIVER
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I wondered about that too. The best plug I ever used was the NGK Iridium plug. They're about $7-$9 each but well worth it. I must say that I have not tried these in a car or truck. I used these in a high performance Zenoah gasoline engine in a radio controlled helicopter. I ran the NGK Iridium plug, Coleman camping fuel instead of gasoline and mixed AMSoil Sabre 100:1 Synthetic 2 stroke mix. Man that was a sweet setup, it seems to produce about 10-20% more power, never flamed out and had an idle that was smooth as butter. Plus after dozens of hours of flight time the cylinder walls still showed signs of the original honing and cross-hatching.
You can order those plugs in various temp ranges from cool to hot.
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RE: spark plugs - 10/6/2007 3:56:18 PM
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Muddydawg75
Posts: 9960
Joined: 3/11/2007
From: South Jersey Shore
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Sorry I missed your heat shield question....
It is part of the plug wire.... and there is a little spring too...
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"I feel sorry for people who don't drink. When they wake up in the morning, that's as good as they're going to feel all day." --Frank Sinatra
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