I have a 97 Honda civic with a D16Z6 engine swap
took it to e-check here in Ohio
passed everything but my NO
was 2671.2 PPM allowable is 749
I have a header on it with a cold air intake and a high flow cat

Was looking for some hints on how to fix this problem any imput would be helpful thank you

 

High flow cat=test pipe?

 

no they put a sensor into the muffler

 

Erm? Is your cat a TRUE high flow cat or is it one of the ones pictured here that they only say is a high flow cat?

 

http://www.summitracing.com/parts/mpe-94109/overview/
this is the one that's on the car

 

What were HC readings? Were they low?

High NOx also can be caused by the engine running lean or hot.

 

the HC were 58.3 allowed is 97
CO 0% allowed 0.54%
CO2 28.5

and yes I have been reading and know its a lean or hot condition was looking for some tips on how to fix it with the modifications I have on my car

 

Well, is the engine running hot? If not, start by checking the ignition timing and replacing the fuel filter.

 

engine is not running hot.
do you know what the timing should be set at? how many degrees?

 

See FAQs sticky for diagram.

Have you already replaced the fuel filter?

 

Are you importing the car into ohio?
Otherwise we don't have emissions testing here... not that it solves your problem, I'm just confused as to why you'd need to do this in OH.

 

not all counties in Ohio have E-check I live in one that does