2.5l TBI jeep 4banger

aftermarket, generic catalytic convertor. Its turning bright red and heating up the whole damn transfercase skid plate.

Any ideas?

Engine is running rich.

Originally posted by Black Dog
Engine is running rich.

heard of manifolds, and exhaust getting really hot due to a lean condition.....but not when running rich :confused:

ya engine is running rich, too much fuel in the mixture and the unburnt fuel is clogging up the converter causing the heat build up. i would recomend pulling the codes. it is most likely a faulty O2 sensor hth

Originally posted by majeeper
ya engine is running rich, too much fuel in the mixture and the unburnt fuel is clogging up the converter causing the heat build up. i would recomend pulling the codes. it is most likely a faulty O2 sensor hth

Yes, the unburned fuel is actually combusting in the cat.

While this subject is up could something like that happen with a glass pack on an older pick up truck. Just wondering because my neighbor has a 73 chevy pickup with a wood bed in it and the other day while he was driving down the highway the bed caught on fire right above the double glasspacks that are there? Just curious.

Originally posted by rckcrwlr87
While this subject is up could something like that happen with a glass pack on an older pick up truck. Just wondering because my neighbor has a 73 chevy pickup with a wood bed in it and the other day while he was driving down the highway the bed caught on fire right above the double glasspacks that are there? Just curious.

No.

so how would a faulty o2 sensor cause it to run rich?

a Coyote?

Seriously tho... Are you getting a check engine light? Is the cat Brand new or was it fine before and just started doing this?

Originally posted by PIA
so how would a faulty o2 sensor cause it to run rich?



You didn't just ask that did you:rolleyes:

Originally posted by PIA
so how would a faulty o2 sensor cause it to run rich?

Gee I wonder what the ECU uses to set the mixture?

Originally posted by Old Scout


Gee I wonder what the ECU uses to set the mixture?

I thought the heeps had a mixture screw on the TB:confused: :flipoff2:

IS THIS FAWKING NEWBIE OR WHAT!!! :flipoff2:


I've swapped out both axles

Gone SOA

I've added powersteering and hydroboost

Added rear discs

Done a shitload of other things to my jeep

BUT I DONT KNOW MUCH ABOUT ENGINES!! :flipoff2:

so yes it was a legitimate NEWBIE question! :rolleyes:

Originally posted by PIA
IS THIS FAWKING NEWBIE OR WHAT!!! :flipoff2:


I've swapped out both axles

Gone SOA

I've added powersteering and hydroboost

Added rear discs

Done a shitload of other things to my jeep

BUT I DONT KNOW MUCH ABOUT ENGINES!! :flipoff2:

so yes it was a legitimate NEWBIE question! :rolleyes:

:D :flipoff2: Thats one of the ways that the ECM decides what the mixture should be. Idk about the 4cyl. jeep but a lot of newer vehicles have one before and one after the cat. If its old and shitty then it won't do its job right and your mixture will be too rich/lean, and as others have said, it sounds rich now. Will also help your mpg.