i recently had to replace my cat after the old one started rattling. the y-pipe didnt fit snuggle on the front of the cat so i used j-b weld to seal it up. a few days later i noticed it was black and breaking off. then noticed the top of the cat looks burnt. replaced the muffle thickin it may have clogged when the old cat broke up, put on new jb weld but it still charred and cracked off.

im also getting a code 32 for egr system, replaced the valve and checked the vacuum hoses but still getting code. could this be causing the extreme rich condition causing the cat to burn or is it the O2 sensor?

 

if it's running that hot, you're either dealing with a clogged cat, or probably running lean. Replace your generic sensors as you suspected, and see what happens. Though, typically a bad O2 will run rich, it still couldn't hurt.


And stop using these lackluster ways of fixing stuff. JB Weld is not for exhausts. If you really need something welded, take it to a shop and they'll be more than happy to do it for about $25-50. Do it right the first time.

 

I doubt your exhauast is "overheating" but rather you are using the wrong tools for what is needed. JBweld will melt and cannot be used on super hot surfaces (ie exhaust). I would get all the holes/gaps welded together and go from there.

 

Went to a Meineke the other day to have a piece of pipe welded onto my SLP Y-pipe for my cat to slip over. Had me pull car onto their lift, quoted me at $40-50, went to bank, came straight back. 45min and $40 later, I had my exhaust fixed. Didn't even bother checking prices around at other places because the price seemed good to me, and one of the kids working their noticed both my front and rear brake setups

They even talked things over with me and had me under the lift working things out before they started, and then right before they welded it up. Great service at that place. I'm probably going to go back and see if they'll weld in my sub frame connectors.