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iTrader: (1)

i had to go to test-only and failed the 25mph with high nox. any suggestions as to how i can pass?? i lowered the timing to 8-9 degrees. the smog tech said it was at 12 degrees

Lexmex

Even though your EGR may show functional...there could be something dirty in there causing the NOX to go just over the limit. I doubt it it is a bad cat or O2 sensor as your other values look very good, especially your HCs. Even though you were under the limit on 15 mph for NOX, those NOX values still look high to me in relation to the other types of emission values your are showing.

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iTrader: (1)

should i try to clean the egr ports?? or possibly change the egr out and try that??

morris

iTrader: (2)

I just had this happen with a 91 civic that I have. I tried several things but the problem turned out to be the CAT. It was bad. NOX was the only value that was out of spec, everytying else looked good.

Just what happened to me.

RTIS250

iTrader: (9)

I would have the EGR valve and passages cleaned out... then make sure to drive the car a little hard before going in to re-smog, be sure the cats are nice and warm.

Lexmex

Clean your PCV valve, too.

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iTrader: (1)

how about using some top engine cleaner?? would that help bring down the readings??

the pcv valve is new installed a few months ago, so i think i sholud be good with that one

GoFaSSter

iTrader: (1)

I just recently had some smog problems. I bought some of the emmissions clean up in a can from Auto Zone. I bought the CRC brand (I am sure brand does not matter). It dropped my Nox values about 200 points on both tests. It dropped the other readings as well. I also drove around in a low gear with high revs to get the cat good and hot.

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iTrader: (1)

is that the stuff you pour in the tank when 1/4 empty and then you fill it up and drive around in??

GoFaSSter

iTrader: (1)

That is the stuff. I have never used it before, but it did the trick.

koolaidman

get an oil change. replace ur pvc(if u have one) ur egr might be stuck closed causing slightly higher levels of nox.

before u go into ur next emmision test do this

oil change
run your engine hard on the way to the emision station
and when ur inline for the emission test. hold your rpms at 2500.

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iTrader: (1)

it sucks to have to go to test only. havent had no time to get around to getting it smogged. since i have to go to test only now, in the future would i have to go back to test-only for my next smog??