ok so i had to take the G20 into emissions the other day, 1st time around she failed.. big surprise!
so it did pass the cruise part of the test, Results:
HC (ppm) limit 150 it got 97
CO% limir 1.1 it got 0.65
ok and heres the failed idle test Results:
HC (ppm) limit 220 it got 311
CO% 1.2 it got 2.08
so today i hooked up the wideband an laptop an did some testing, well i found it does the same thing my car was doin when it failed, it would only stay at 14.7 for a short time before going to 13.0 afr..
So i tryed everything i did to my car, nothing was working.. so then i was like what the hell an turned the o2 sensor off in nistune then played with the injector multiplier until i got a idle of 15.3 afr that would slowly creep to 14.7 an stay there and the cruise was 15.0-15.6 afr.
the thing is when u play with the injector multiplier things get out of whack, im sure if i were to floor it the car would go really lean (because i moved the # down which makes things leaner) So i only did this to pass emissions, i will replace the o2 sensor when i can afford it, or just say screw it and tune around it.
OK so sent the gf back to the emissions place, BOOM passed with flyin colors!!!
Cruise Results:
HC (ppm) max 150 it got 21
CO% max 1.1 it got 0.03
Idle Results:
HC (ppm) max 220 it got 42
CO% max 1.2 it got 0.02
So moral over the story is, shoot for 15.0-15.3 idle/cruise afr and you will pass emissions with ease!