I was searching the net for something I can't remember and came across this Civic faq on 92-95 civics by txgreasemonkey.

It stated that engine knock on a 93 civic dx was solved by using a plug 2 steps colder

https://www.askmehelpdesk.com/cars-t...tml#post324106

I was wondering, wouldn't the plugs foul?

I ask because my civic (93 lx) had high NOX, like really high - 2 times the limit high, and these cars did not come with an EGR so controlling nox involves little more than a ouija board and some lavender incense.

I was thinking that using a colder plug would help nox? Engine seems to knock as well, but others have told me the noise sounds more like bad main bearing (though it's been there for 6 years, car sort of sounds like a deisel idling but not as loud)

Car failed smog with a gross polluter rating or whatever due to the crazy high nox, smog shop replaced cat and it passed - surely the cat isn't the only controlling mechanism for nox on these engines (D15B7) ?

I ordered the NGK ZFR7F-11's, but will they foul? If not, do you gap them the same? Thanks for your help.

Gap the same. I've never had fouling problems. Let me know how it goes. In my engine (D15B7), knock manifested itself in valve noise.