NGK TR55-IX plug gap

[ssbowtie1]

Is plug gap on iridium plugs any different than the NGK TR55 plugs? Engine is stock with bolt ons. Should I just go with .040-.050.

Also I've had these plugs for about 10k miles. Is there a way to clean them before putting them back in?

Finally, how do you guys gap your plugs. Do you use feeler guages or are those cheap autozone round gappers accurate?

[ss.slp.ls1]

Originally Posted by ssbowtie1

Is plug gap on iridium plugs any different than the NGK TR55 plugs? Engine is stock with bolt ons. Should I just go with .040-.050.

Also I've had these plugs for about 10k miles. Is there a way to clean them before putting them back in?

Finally, how do you guys gap your plugs. Do you use feeler guages or are those cheap autozone round gappers accurate?

I think a .045 gap will do you fine. You could spray them with some brake cleaner. I use the little round gapper to measure the gap and I bend the little arm to get the gap I need.

[mtuggle86]

Iridium plugs come pre-gaped

[krill]

I gapped my TR55-IX to 0.05 with a caliper and the car runs great.