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my mustang had 58,000 miles when i bought it,and i just changed spark plugs,and the gap on the old plugs was .43 and they all looked great,so i put the same type plugs back in which are autolite,764s and gapped then the same.i know the gap is supposed to be .54,but if i try to gap them to .54 it just looks too wide,any ideas,what do you guys set them at?
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Just went through the same thing with my '96 earlier this year. Went to do plugs, pulled the old ones at 82k and they looked virtually brand new with a gap of about .043-.045. Just regapped for the spec's .054 and let it go... Seemed to pick up a small about of throttle response and mileage but I don't remember anything dramatic.
Edit... I hope you didn't try to gap them at .54 as thats over 1/2 of an inch!
i gapped mine at .053. thats what the gap was when i pulled them out as well
they should be between .053-.055 if i remember correctly
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Things to do:
1) Fix exhaust leak
2) Remove isolators
3) Get rear decklid shaved and painted DONE
4) Get fog lights sprayed with black/clear mix
5) Get lower valence re-sprayed
I think you're right with that range... If you're using a double platnum plug you'll see VERY little gap growth. Combine that with a fairly effective ignition system like our cars have (EDIS or COP) and I can see no reason to run a conservative gap.
yea,i see my mistake,should be .054.my other question is,when i bought the new autolites,764s,the gap was at .045, the same as my old plugs,but if i try to gap the new plugs at .054 like it is supposed to be,it makes a slant in the gap? it is hard to gap them to .054.can you tell me what is wrong?
You are obsessing over this. The tip of a platinum plug is small enough that the side-electrode being slightly canted is irrelevant--gap the silly things at 0.054" and stick 'em in...
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-cliff knight- My Mustang
2003 GT, UPR X, Magnaflow, 180° stat,
PP 70mm TB & plenum, Sniper tuned
3.73s, 262 rwHP/305 ft.lb.
Multi-fuel: burns gas and rubber...
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spark plug gap?
