Well, I had to smog again and I didn't want to remove my chip (it's a fordchips chip) because I get a downstream O2 heater sensor fault with it pulled out.
I knew from looking at OBD traces that my chip totally deletes all the downstream O2 monitors (no cat efficiency, no O2 slow, no heater circuit) as well as the EGR monitors. I hoped that the smog computer only looked for failed/incomplete monitors as opposed to expecting a set list to be there - and it looks like I was right. Since all the monitors that do exist had passed the check was happy.
It's nice not to have to buy a new downstream O2 sensor just to fix the heater circuit fault since the sensors arent really used anyway even if I had the chip out (MIL eliminators for mystery mod done before I got the chip).
Anyway I passed - good for another 2 years. I think I might have a bad plug or wire though as I was RIGHT at the limit for low speed HC - limit of 56 PPM, measured 56 PPM while the CO was exactly at the AVG mark (.02%) so I don't think I'm just running rich, NO was measured at 0 PPM. The HC dropped to 21 at 25MPH test, still above the average of 7 but only half the max allowed of 40.
Whatever - I passed and am good for another 2 years.
I knew from looking at OBD traces that my chip totally deletes all the downstream O2 monitors (no cat efficiency, no O2 slow, no heater circuit) as well as the EGR monitors. I hoped that the smog computer only looked for failed/incomplete monitors as opposed to expecting a set list to be there - and it looks like I was right. Since all the monitors that do exist had passed the check was happy.
It's nice not to have to buy a new downstream O2 sensor just to fix the heater circuit fault since the sensors arent really used anyway even if I had the chip out (MIL eliminators for mystery mod done before I got the chip).
Anyway I passed - good for another 2 years. I think I might have a bad plug or wire though as I was RIGHT at the limit for low speed HC - limit of 56 PPM, measured 56 PPM while the CO was exactly at the AVG mark (.02%) so I don't think I'm just running rich, NO was measured at 0 PPM. The HC dropped to 21 at 25MPH test, still above the average of 7 but only half the max allowed of 40.
Whatever - I passed and am good for another 2 years.
