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<blockquote data-quote="swampratt" data-source="post: 3851529" data-attributes="member: 15054"><p>Could be external heat cracked them.</p><p>Yea my corolla calls for .031" and I always had those carbon tracking lines on the porcelain part of the plug where it meets the steel nut portion.</p><p>Tighten the gap to .025 and no more misfires and MPG came up a tick and idle got smoother.</p><p></p><p>I was at Able racing a couple years ago and they had a Ford twin turbo truck in there with a misfire.</p><p>Dealership could fix it.</p><p>Yes more boost was ran on this set up than factory.</p><p>New plugs and new coils and then some aftermarket racing coils added.</p><p></p><p>On the dyno for a couple pulls and they pulled a spark plug.</p><p>They passed it around and everyone thought it looked fine.</p><p></p><p>Yea it has less than 20 miles on it and i got it in my hands and noticed that faint misfire line on the porcelain.</p><p>I told them tighten the gap this is finding a different path to ground as too much cylinder pressure and too much gap is causing it.</p><p></p><p>They Had new plugs on the way and tightened the gap and all was well.</p><p></p><p>I would not run that .041" </p><p>Look at your old plugs do you see the little straight dirty lines on the porcelain.</p><p></p><p>Thing is about plug gaps is try and see what works best for you.</p><p>Its free to do so.</p><p>I like trying free things.</p></blockquote><p></p>
[QUOTE="swampratt, post: 3851529, member: 15054"] Could be external heat cracked them. Yea my corolla calls for .031" and I always had those carbon tracking lines on the porcelain part of the plug where it meets the steel nut portion. Tighten the gap to .025 and no more misfires and MPG came up a tick and idle got smoother. I was at Able racing a couple years ago and they had a Ford twin turbo truck in there with a misfire. Dealership could fix it. Yes more boost was ran on this set up than factory. New plugs and new coils and then some aftermarket racing coils added. On the dyno for a couple pulls and they pulled a spark plug. They passed it around and everyone thought it looked fine. Yea it has less than 20 miles on it and i got it in my hands and noticed that faint misfire line on the porcelain. I told them tighten the gap this is finding a different path to ground as too much cylinder pressure and too much gap is causing it. They Had new plugs on the way and tightened the gap and all was well. I would not run that .041" Look at your old plugs do you see the little straight dirty lines on the porcelain. Thing is about plug gaps is try and see what works best for you. Its free to do so. I like trying free things. [/QUOTE]
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