Spark Plug Gap
Senior User
Joined: Dec 2003
Posts: 354
Likes: 1
From: Memphis, TN USA
I used to take the word of part clerk and telling me that it is already gapped to the right specs for my vehicle.
One day I checked the gap just to make sure and not all of them have the same gap and I have to adjust it myself.
Everytime I order spark plugs, I always tell them to write the gap specs on the side of the spark plug box and check it for myself.
One day I checked the gap just to make sure and not all of them have the same gap and I have to adjust it myself.
Everytime I order spark plugs, I always tell them to write the gap specs on the side of the spark plug box and check it for myself.
Post Fiend
Joined: Apr 2004
Posts: 6,473
Likes: 4
From: Lafayette, IN
It can make a world of difference. The gap range is usually about 10% of the gap, and I always set it to the LOW end of the gap, I've found that the engine typically runs better that way. The voltage required to jump a given gap is a linear function, so a 10% increase in gap size requires 10% more voltage to jump the gap. But you should have plenty of voltage to spare if your ignition system is in working order. And, as the plugs wear, that gap opens up (albeit very slowly), so you may as well start on the low end of the range.
Jason
Jason
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ssKable
Explorer, Sport Trac, Mountaineer & Aviator
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Mar 5, 2005 12:46 PM
