ZR-1 Net Registry Forums - View Single Post - Headers , Exhaust and emisions in Colorado

4-cam · 05-19-2014

Emissions readings: failed HC in original test
Limit for HC- 1.5 gpm
Failed test-3.6 gpm
Passed - 1.27 gpm

CO limit-20 gpm
Failed test-1.1092
Passed-1.1701

NOx limit-3.5 gpm
Failed test-2.3
Passed-2.7

Colorado has this goofy grams per mile reading. No real way to convert to ppm as a 5 gas analyzer would read.

After i put a few more miles on it today I dont think im done yet but at least emmisions is done . I can work on it and be legal.
Plugs are still looking to hot. Even with colder ngk bkr7e plugs they are grey/ white. I dont think its a tuning issue at this point. I think somthing else may be going on. When we first put the new tune in it it seemed to run great. The more I drove it , it seems go run rough, and the flywheel starts to make noise. I shut it down, reset power to the ecm and restarted it and it smoothed out and ran better. No codes were set. Then started doing it again and repeated the cycle after a out 1/2 hr of drive time. Could the ecm be pulling fuel out for some reason? From previous data logs the O2 sensors seemed ok and the curent ones only have about 2k miles on them.
Anyone have any ideas? I didnt get any data logs during my last run, so I need to put a few more miles on it and do so.

05-19-2014	#24
4-cam Join Date: Feb 2010 Location: Arvada Colorado Posts: 192	Re: Headers , Exhaust and emisions in Colorado Emissions readings: failed HC in original test Limit for HC- 1.5 gpm Failed test-3.6 gpm Passed - 1.27 gpm CO limit-20 gpm Failed test-1.1092 Passed-1.1701 NOx limit-3.5 gpm Failed test-2.3 Passed-2.7 Colorado has this goofy grams per mile reading. No real way to convert to ppm as a 5 gas analyzer would read. After i put a few more miles on it today I dont think im done yet but at least emmisions is done . I can work on it and be legal. Plugs are still looking to hot. Even with colder ngk bkr7e plugs they are grey/ white. I dont think its a tuning issue at this point. I think somthing else may be going on. When we first put the new tune in it it seemed to run great. The more I drove it , it seems go run rough, and the flywheel starts to make noise. I shut it down, reset power to the ecm and restarted it and it smoothed out and ran better. No codes were set. Then started doing it again and repeated the cycle after a out 1/2 hr of drive time. Could the ecm be pulling fuel out for some reason? From previous data logs the O2 sensors seemed ok and the curent ones only have about 2k miles on them. Anyone have any ideas? I didnt get any data logs during my last run, so I need to put a few more miles on it and do so.