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Originally Posted by iceman2
BTW, do you know the GM part Number for the original spark plugs? The ones in there now are 41-940, they look a little warn, but not bad, I can't tell if they're original, the van has 130k miles.
Mark
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What year is the Venture? I did a quick look and the '99 model uses the 41-940 (GM#25163148) and the '03 model uses 41-101, and the '01 model shows a part # of 41-979 (GM #25333938 ). They probably are original equipment in there now as many people I have spoken to over the years have mentioned they thought that the 100,000 mile plugs are just that, you keep them in for 100,000 miles. I usually tell them that it is a good idea to check them anywheres from 60,000 to 75,000 miles because they can wear out before 100,000 miles. At least with the GM minivans owners have this opportunity to do just that (check them before 100,000 miles) as the intakes usually fail before then, and when the engine is torn down to replace the gaskets, it's an excellent time to replace the plugs.