Failed emissons in N.J.......help........

The computer seems to be the most obvious culprit, but I wouldn't draw a final conclusion on that just yet. I will ask some of my buddies about your NOX problem to see if I can dig anything up. Assume that you are running an automatic stil. If someone else in the forum knows the immediate answer I am sure they will type up.

Just curious about a few things and neither of them necessarily has anything to do with why you failed. Just thinking out loud about it. I live in NJ with a 95 as well and a very similar setup. The only difference is that I have always had a 5-speed and associated computer (I am not sure that they are that much different, but I cannot state that I know this for sure).

I have to go through inspection this month. My sticker is 7 - 2005 so I only have about a week left. I need to fix an exhaust leak before I bother to go.

1 - Is your timing advanced. If so, how far?
2 - What grade fuel are you using. Premium, regular etc?
3 - When is the last time, if ever, that you ran fuel injector cleaning agents through the system?
4 - How does your air cleaner look. Fairly new, dirty?
5 - When, if ever, did you change your fuel filter?
6 - Did you modify your injectors or are they still bone stock?

Again... Just thinking out loud. None of this maybe the reason you failed.

EGR valve or bad cats...

I vote EGR. Mine was bad and I did a 697 (of 700) here in CT so I barely passed.

Also the air injection for the cats teys to help cut back on the NOx emissions. My cats were basically new.

BDAWK2002 said:

I just failed inspection because of high emissons.The guy told me it failed because of a high NOX reading.It is supposed to read 907 and mine read 1259.The guy told me NOX has somthing to do with the temp of the gas in my exhaust and he want $120 just to try and diagnose what the problem is.After paying him $70 for the inspection I told him forget it i'll figure it out myself somehow.Anyone have any ideas at what the problem might be..I have new o2 sensors and a new exhaust from the headers all the way back so it cant be any of that stuff and I have no checkeng light on either.I also just put in a computer from a 5spd because I just did the swap so I dont know if that matters at all.I have no idea where to start so please help......

Click to expand...

70 bucks for an inspection? Damn its 29 here in MA.

Anyway, as I understand it, if you're at stock timing and you're running 94 fuel (god knows why with the price and lack of power gain) then doesnt that make your engine burn the fuel less efficienty? Could that be the cause of crappy emissions?

I figure if the fuel is not getting burnt up as it should, then there will be lots of un-burnt particulates in the exhaust gas, thus causing crappy emissions.

Remember that the octane rating of a gasoline is NOT the amount of energy in that gasoline. It is a measure of that gasoline's sensitivity to knock. A 94 octane gasoline can withstand more compression then an 87 octane gasoline before it prematurely detonates (pings) due to compression.

Since you haven't modified your timing or compression ratio, using a higher octane gasoline will, if anything, decrease the performance of your car. Switch back to 87. You'll use the fuel more efficiently, go faster, and save a ton of money.