i just tested my car today and failed the NOx ppm part:

Reading at 25mph test was:1471 / Allowable: 1179 FAILED

Reading at 15mph test was:1570 / Allowable: 1304 FAILED

They said it Possible prob might be: Cylinder Temp of 2500,Timing,EGR system, or Cat.

i really need help, which one do you guys think is the most problem causing it, so i can replace it or fix it.and is there any NOx reducing liquid cleaning formula?.Thanks in advance!!


[Modified by crx dragga, 5:36 PM 10/31/2002]

 

the hotter the cat the more oil it burns.....

 

maybe you shouldnt look so far, my integra failed sooo horribly bad, and all i did were a few things:

new spark plugs
new air filter
and i added some fuel injected gumout from autozone.

passed brilliantly...

 

im gunna do this

-new spark plugs
-new air filter
-and i added some fuel injected gumout from autozone.
-emissions free fluid from Auto Zone

and run mah baby till her cat gets hot Thanks fellow H-T members

 

what are the other readings? (CO, HC, etc.)

 

the readings were:

At 25 mph

HC-ppm 0088 / allowable: 160
CO% 00.66 / allowable 0.90
NOx-ppm 1471 / allowable 1179 FAILED
RPM 2467 / allowable 1500-3000
CO+CO2% 14.2 / allowable 6.0min

At 15mph

Reading/Allowable
HC-ppm 0085/166
CO% 00.63/0.93
NOx-ppm 1570/1304 FAILED
RPM 2771/1500-3000
CO+CO2 % 14.3/6.0 min

 

Your NOx is high either from lean running or overadvanced ignition. You have a very low CO which shows good combustion, but with the moderate HC shows either slight missing (can also be caused by lean mixture) or oil burning.

Try retarding your ignition timing to the minimum allowed value and see if that helps...

 

sorry, misread the CO, but try retarding the ignition a little and see if that helps... BTW, that header will not help you in trying to get the catalyst hotter...

 

owned

 

retarding is moving the dizzy away from the firewall? and how little? header on the car? if so its a stock manifold and 1 last thing im running an HF ecu on a Si motor, could that cause anything?

sorry for asking too many questions just wanna get everything right and good before going back and giving it a 2nd try for free , or i will have to pay the 3rd time.

heres a for yalls helps.Thanks!!!

owned?


[Modified by crx dragga, 12:05 AM 11/1/2002]

 

yes, retarding will be clockwise looking from the transmission end of the engine bay... hope that works for you...

 

i say you replace the cat as well

 

just frok out the bills to get a smog... those benjie if you kno wat i mean