GroversXJ
NAXJA Forum User
- Location
- Peoples Republik of Kalifornia
I just took my 90 cherokee to get its smog done and it failed the functional gas cap so i bought a new cap, but it also failed the 2500 RPM CO test. My CO was 2.08 when a passing max is 1.0. I understand when you don't pass the CO at high RPM its because the mixture is too rich. I checked my air filter and it was almost completely soaked in oil and garbage flushed up from the valve cover. even the hose that vents the valve cover into the airbox was mostly plugged with black stuff.
I bought a new air filter and replaced the valve cover vent hose. I bought some acetone to put in the tank, and tried to check the oxygen sensor but couldn't figure out how to do it as the haynes manual didn't make sence. I did change the oxygen sensor last time I didn't pass smog so I don't think its bad.
Do you think changing the air filter and the hose will be enough to lower my CO levels as it will be able to breath better at speed, or what else should I do?:tear:
FYI: Idle levels (co2=13.2, o2=1.7, HC=23, CO=0.0)
2500 RMP levels (co2=13.3, o2=0.0, HC=56, CO=2.08)
I bought a new air filter and replaced the valve cover vent hose. I bought some acetone to put in the tank, and tried to check the oxygen sensor but couldn't figure out how to do it as the haynes manual didn't make sence. I did change the oxygen sensor last time I didn't pass smog so I don't think its bad.
Do you think changing the air filter and the hose will be enough to lower my CO levels as it will be able to breath better at speed, or what else should I do?:tear:
FYI: Idle levels (co2=13.2, o2=1.7, HC=23, CO=0.0)
2500 RMP levels (co2=13.3, o2=0.0, HC=56, CO=2.08)