John Kim

so I try to use a spark plug defouler and they come with two when you drill a hole when you extend with so it didn't work but I just used one in the work fine

UnknownJinX

I had to look up and see what a defouler is. I can't see why you would use it.

In a rotary engine, the spark plugs already are tucked back a bit due to the nature of the engine, especially the trailing plug. Now you are pushing it back even further? Oof, as if rotaries already don't have trouble igniting all the fuel in there.

If you have a lawn mower or something you don't give a crap about then go ahead. In a car? Learn to troubleshoot properly.

NotAPreppie

I wonder how many people actually use spark plug defoulers on spark plugs rather than using them to try to fool O2 sensors (which won't work on most modern cars now, anyway).