1992 240sx SE EMISSIONS FAILED

[boostdet]

**** i dont know guys

NO is reading at - 2009 and it needs to be at like 945CO is reading at - .77 it needs to be .73

any suggestions?

Catalytic Converter is one thing i had in mind

the car seems to need oil change and basically all in all tune up -- other than that i just dont know

as far as mods

just an intake

[boostdet]

got the cat changed

so how do i work on the EGR valve?

or...what do i add to the fuel..to pass!!

[Ii3edus]

i had the same issues. changed my cat. and added fuel additives just made things worse. for me it took a $50 timing light gun and 10mm socket. adjusted the timing which was at like 10 degrees instead of 20. problem solved. for me anyways

[LordOfTheMiasma]

jus slip the guy testing you some extra money, i live in wonderful florida where there are no emission laws but i have seen many people talking here on nico about how they pay there way through emissions... jus gotta know someone..lol

[sleepyRPS13]

its not just the egr. if you go slightly lean it can cause the nox to go up up!

-overheated engine

-lean air/fuel mixture

-vacuum leaks

-overadvanced ignition timing

-defective egr

anything that can cause higher combustion temp!