LS1tech,
I bought my car in to get emission test today and it failed under the 15mph test. Here are the results
15MPH | 25MPH
Limit Reading Result | Limit Reading Result
HC ppm 48 10 Pass | 53 12 Pass
CO% .19 0 Pass | .28 0 Pass
NO ppm 632 791 Fail | 614 536 Pass


Is there any reason the NO result was higher at low speeds? and My car is a 1994 Z28 A4 stock except for GMMG and CAI. Any thoughts about what I can do to help it pass?

Thanks George

 

Man that's not too far off. Go to O'Reilley and get a can of "Guaranteed to Pass" and follow the instructions.

 

Yea i heard about that is that stuff proven to work? I dont want to have to spend the 75 dollars to figure out the problem and fix it lol

 

My old boss ran it in his h-piped 89 lx 5.0 and passed the sniffer test after failing once. I have never used it myself but have heard several accounts of it working and none of it failing.

 

Hmmm ill go out and check that and ill take it back to see what happens. Anyother advice to what it might be?