Hello,
I have a 2001 Jeep Cherokee with 165,000 miles on the 4.0L I6, and it seems to be misfiring and is very sluggish. It is not showing any engine codes but I replaced the spark plugs, coil pack rail, fuel injectors, vacuum lines to the intake manifold, CCV, and MAP sensor. I am replacing the exhaust and I did notice my catalytic convertor is glowing red on the inside honeycomb part when it gets warm, I am not sure if this is normal. I would appreciate any suggestions and advice, thanks in advance.
If the cat is glowing red that may indicate an instruction inside.
since your replacing the exhaust system you can either remove the 02 sensor or remove the bolts to the cat and separate it. If you drive the car and the sluggishness goes away that would indicate the cat is plugged. If you have a scanner with live data capability I would look at the fuel trims, Cat temperature, etc. Good luck....
Sorry obstruction not instruction.
I took the cat off and it is still running very rough
There are 3 cats on a 2001 Cherokee 4.0, the usual one under the car plus two pre-cats integrated into the exhaust manifold and there are 4 O2 sensors.
A glowing cat means there's unburnt fuel in the exhaust, which is what happens when you have misfire (it's not burning). Look in the Frequently Asked Questions (FAQ) topic at the top, and click on misfire.
Im just gonna junk this pile of crap
I think you'll be glad you did