why re-gap spark pluggs?

[tybardy]

I remember some time back reading that people were gapping their spark pluggs to .040 instead of .060.... i saw it again today on a different thread and though i would ask the question... why?

 

[jmildoc]

Ty I saw this same thing and was wondering if i should go out and check mine. Hope someone gets an answer for both of us.

 

[Grebbler]

I believe it was because GM changed the spec around 06 or so to .040 to limit misfires and such. New GM Iridium's and such are pre-gapped to .040.

 

[BOSS]

So that begs the question, to do - or not to do?


BOSS

 

[tybardy]

i think i shall...

 

[Sepiroth]

If you're going to do the work of regapping the plugs, IMHO just replace them. That is unless your plugs are new.

 

[tybardy]

If you're going to do the work of regapping the plugs, IMHO just replace them. That is unless your plugs are new.

my plugs have less then 6k miles on them... i will probably buy new ones and gap those to .040 though... due to recomendation, i use NGK pluggs in my truck which are only $2, so getting 8 more is no worries

 

[Max]

You'll gain more top end power and a bit of fuel economy. They essentially corrected an error in gapping the plugs too much, I've ran .035 on a bunch of nitrous trucks or forced induction...cooler heat range of course.

 

[withac]

The NGK's I put in mine came pre gapped and warned not to adjust the gap because the center electrode is so small it could be damaged.

 

[jmildoc]

NGK's huh I put Autolite Platinum in mine about 3500 miles ago, should I take a couple out and check them?