1990 XJ 4.0L
I Failed emission last week with 85.2 Carbon Monoxide. It needs to be 20.0 to pass.
So we replace the Injectors, Airfilter, Spark Plugs, Distributor(not cap) and oil.
All of the above were due or needed.
After doing the above I noticed the pedal to be a bit more responsive.
I Just got back from the Emission center and Failed again. This time I got 142.0 Carbon Monoxide. How can it be even worse than before?
The Jeep seems to be running good. It doesn't miss. The Idle seems ok. It seems to have good accelleration.
We put it on a MT2500 Scan tool and it has no error codes. Everything looks normal except the O2 sensor reads 5 volts. The O2 sensor is less than a year old and has read 5 volts since it was installed. We compared it to my buddies Jeep that did pass emissions and evething on the MT2500 looks the same including the O2 sensor reading. I'm baffled. I have no Idea what to do next. :dunno:
I Failed emission last week with 85.2 Carbon Monoxide. It needs to be 20.0 to pass.
So we replace the Injectors, Airfilter, Spark Plugs, Distributor(not cap) and oil.
All of the above were due or needed.
After doing the above I noticed the pedal to be a bit more responsive.
I Just got back from the Emission center and Failed again. This time I got 142.0 Carbon Monoxide. How can it be even worse than before?
The Jeep seems to be running good. It doesn't miss. The Idle seems ok. It seems to have good accelleration.
We put it on a MT2500 Scan tool and it has no error codes. Everything looks normal except the O2 sensor reads 5 volts. The O2 sensor is less than a year old and has read 5 volts since it was installed. We compared it to my buddies Jeep that did pass emissions and evething on the MT2500 looks the same including the O2 sensor reading. I'm baffled. I have no Idea what to do next. :dunno: