plug question., slowly shrinking gap? Options

[Bitter]

i KNOW i had all 4 of my plugs at .8MM about 6 months ago. i regapped them the other day and 3 were at .65-.75MM with one still at .8MM. is this within normal bounds or is something awry? i can tell when the gaps are getting out of whack, i get slight misfires at an unloaded idle.

the plugs read as my combustion temp being a little high but not out of a 'normal' range. i expect this from my timing advance, but this slowy shrinking gap has me a little concerned.

[LewFX]

what kind of plugs are these?

[Bitter]

ah i did forget that information!

plain jane Delco brand plugs, whatever stock 7afe specs are is what these plugs are. regular steel plugs with a black oxide coating, about $1 each. plugs are pretty much plugs, i got these after a bad run with bosch platinums. no one told me that the 7afe likes a wider gap on plat plugs (.044-.046 inch vs .030 inch for standard i beleive).

[LewFX]

get some denso or ngk and be happy

[Bitter]

get some denso or ngk and be happy

and the difference between standard delco plug and a standard denso (ngk is denso btw) plug is what?

while i do appreciate the response, im looking for the root of the problem. i suspect that even a set of standard denso plugs would do the same thing since theyre constructed of the same material as the delco plug. like i said, standard plugs are standard plugs.

This post has been edited by Bitter: Jun 21, 2006 - 7:34 PM

[LewFX]

i thought irridiums are far better than standard..im too lazy to look in my manual about this, ill try a google search

[Bitter]

i thought irridiums are far better than standard..im too lazy to look in my manual about this, ill try a google search

irridiym and platinum plugs just have a longer service life, in the 7afe and 1zzfe/2zzge you have to widen the gap because you get a weak spark between the points. this is because the sharp point conducts too well and the needed potential isnt reached with the stock gap.

[Bitter]

any other input?