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Old 06-28-2007, 12:27 PM   #1
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Question about Spark Plug Gap??

I replaced my plugs today with Champion truck plugs #4412 and when I took out my old plugs they didn't really look bad but they were gapped between .52 and .59. Isn't the correct gap for a 4.0L .35?? I could tell that it ran better after I replaced them, just wondering if this may be why. Also what would a larger / smaller plug gap do to the way an engine runs??

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Old 06-28-2007, 12:52 PM   #2
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Originally Posted by jherrin215 View Post
I replaced my plugs today with Champion truck plugs #4412 and when I took out my old plugs they didn't really look bad but they were gapped between .52 and .59. Isn't the correct gap for a 4.0L .35?? I could tell that it ran better after I replaced them, just wondering if this may be why. Also what would a larger / smaller plug gap do to the way an engine runs??
Thats what the plugs wore down to, as you use them the gap starts opening up as the material 'wears' away on both parts. You can regap them but it's just as cost effective to just replace them. Also one of those handy coin sized gappers works pretty well once you check it with a good set of gauges.

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Old 06-28-2007, 12:55 PM   #3
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Yeah that's what I used. It doesn't seem that the top part is worn at all. They are all still square on the ends. The electrode does seem to have some wear, but .2 is a lot of wear I would think. But I don't really know, that's why I posted it up on here!!
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