[satchrox]

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.

[TxGreaseMonkey]

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.