i smoged my car last week and failed, nox max at 15mph is 711 measured was 1208...changed cat and failed again at 1003?! at 25mph passed with 680's on both trial(max is 754 at 25mph) and everything else passed too...dont know what the hell it could be? someone help me out quick? i'm going to try changing the o2 sensor and cleaning out the intake mani and use some additives, i need to bring the nox level by 300 what else can i do??

 

well this is kinda a free bump cause i don't know. i do know that i am glad i don't live anywhere that has emmisions.

 

did you change oil, plugs, wires before smogging?? try running it on the freeway before you go to smog

 

email me, i can take care of your smog. steve@tech43.com