LT1 Z/28

iTrader: (1)

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

slow96z

iTrader: (12)

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

LT1 Z/28

iTrader: (1)

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

slow96z

iTrader: (12)

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.

LT1 Z/28

iTrader: (1)

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