Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum - View Single Post - HiGH NOx smog test need any help to pass!!

dennydizzo · 07-09-2009, 06:55 PM

ok so instead of taking out my egr and cleaning it i got another catalytic converter and hooked it to my car and took it to a smog shop(a no pass no pay place) to see how the new numbers will look...turns out i still failed due to high nox at both speeds only went down about 200..

so after avoiding removing and cleaning my egr looks like i have to..and ive read that retarding the timing will reduce NOx numbers..this is correct? and how much can i lower it without damage..

07-09-2009, 06:55 PM	#32
dennydizzo Zilvia Member Join Date: Jan 2009 Location: SUNNY CA!! Age: 33 Posts: 204 Trader Rating: (4)	ok so instead of taking out my egr and cleaning it i got another catalytic converter and hooked it to my car and took it to a smog shop(a no pass no pay place) to see how the new numbers will look...turns out i still failed due to high nox at both speeds only went down about 200.. so after avoiding removing and cleaning my egr looks like i have to..and ive read that retarding the timing will reduce NOx numbers..this is correct? and how much can i lower it without damage.. __________________ LOVIN ME TOOFODEE!!