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Old June 6th, 2008, 11:24 PM
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Jim Kochenderfer
1994 D90
Join Date: Oct 2007
Location: Omaha, NE, USA
Posts: 26
Champion Spark Plugs

I looked up the required spark plug on the Champion Spark Plug website and got a number of RN11YC4 (322). Then checked the owner's manual and the shop manual and got a number of RN9YC (415). The plugs in my '94 D90 with stock 3.9 look to be original (70,000 miles) and they are RN11YCC. I'm all checked out on what the numbers and letters stand for so I know that the 11's are two heat ranges higher (hotter) then the 9's, otherwise, the plugs are identical. I pulled out four of the plugs and they show no signs of running hot. So what gives, what am I missing and which Champion should I be using, or am I obsessing over nothing (yeah, like that's never happened before).
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Old June 7th, 2008, 10:26 AM
woldd90's Avatar
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1997 D90 ST #1444
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Join Date: Aug 2005
Location: Georgia
Posts: 5,329
I would go with the factory recomended ones. I do not think it will matter much one way or the other.

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Old June 9th, 2008, 03:48 PM
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Troy Smith
1995 D90 SW
Join Date: Oct 2003
Location: Roanoke, VA, USA
Posts: 254
Champion Truck Plug 4404
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