so saturday i went wheeling. i wheeled pretty hard. every thing was fine sunday and monday but today i had to go to superior, about a 60 mile trip, and half way there my floor under the rear seat starts SMOKING!!!! it was getting so hot it was burning the rubber seal stuff thats under there. the muffler is right under there. it has never done this before and i have drove it thousands of miles. what do u guys think?

 

clogged muffler

 

what would clog it?

 

Engine crap. Thats a technical term

If it is gettting so hot that it is discoloring then your engine may be running lean (even if the head temp is lower, which might lead to believe of more troubles).

 

is the heat shield still above the muffler??

 

also i have like no low end power. coming up the canyon i was goin 35 flooring it. i usually go 55. idk if this is related.

 

Check the muffler and cat.

 

Your jeeps running rich and you either have a clogged muffler or cat

 

Clogged cat- very common when the engine is left to idle for long periods of time, like when you're waiting on a trail for someone in front of you to get unstuck.

What's the exhaust sound like? Any "whistling"?

Remove the muffler and see if that helps. If not then try removing the cat too.

 

how would i go about checking the muffler and cat?

 

What's the exhaust sound like? Any "whistling"?

no whistling that i heard. it was giving alot of "putter" though more than usual i thought, mabey i was just accually listening though.

 

Take it off, Look through it, bang it up see if anything comes out. Than keep it off and throw a flowmaster or a cherry bomb on there

 

thats what i was thinking. this has just givin me an excuse to put a nice deep muffler on there.

 

Yeah mine had a hole in it and it was clogged up so i threw a flow40 on there, its nice and deep, turns alot of heads and everyone looks surprised when they see its an xj, but it does drone out at about 16-1800 rpms, but i like the deep hum. It also doesnt have an aggressive roar with revving like a cherrybomb would, but its deeper than a glasspack

 

ya thats what i want. i dont wanna sound like a harley cranking it at a million rpm. but i do want a nice "healthy" sound.