BlUAc

I have a 90 cb7, when I smogged my car numerious times it failed the nox emisions. Across the board it was all low, the co, hydro carbons and o2 was all below average. But the nox was way above average it was like 1800 pionts on the 15 and 25mph test. So far I have replaced the cat, cleaned out the egr ports, checked vacume to egr, cleaned the intake, flushed and replaced cooliant, checked compression steady on all four and changed the ect sensor but still has not passed. i dont have the money for a diagnostic ryt now. The only thing that I can think of is my ignition is a msd blaster 2 coil, can that be the reason my nox is so high? and why all the other tests are below average? N E help will be most apprecihated.

notAdiesel

i heard people say to buy a bottle of that "guaranteed to pass emissions" stuff at wal-mart and run the car hard for a while to clear it up
i'm not sure if it actually works but if you think it's worth a shot go for it

BlUAc

^^ that was the first thing i tried, n e one else? P adams got some wisdom to pass on

cctgene

Just a thought - Have you tried applying vacuum to the EGR valve at idle? The car should stumble or stall. If it doesn't then your EGR ports are still clogged.

BlUAc

I have tried that also it dies out quik

BlUAc

let me rephraise the question. can the msd blaster 2 ignition coil raise the nox temp high enough to not pass the smog test?

hemet_sucks

I had the same thing to high of nox so my friend told me to use "cold spark plugs" it's the plugs you use if you have nos or turbo the gap on them is really close and I passed

BlUAc

cold spark plugs? I'll try that but how does that work

notAdiesel

the way it works on 2-strokes (like my dirtbike) is it's a different number plug (BR9ES vs BR8ES for that) and the 8 "runs cooler" people say. so it could be something with the gap, or type of plug

but if you had the stock ignition coil and could put it in easily that would probably be better (idk if its hard or not, i haven't done it)

BlUAc

well if I had the stock coil I would use it but I dont no more it took a dump and does n e one here know of the spark plug part number for colder plugs?

dtapia

why don't you just put plugs in and see what happens then maybe try a new stock coil.
still dont understand why people dont stick with the stock coil. the msd is not any better.