jscherb
Expedition Leader
A couple of maintenance items to take care of when I get home - the 4wd light in the dash isn't illuminating so I'll have to troubleshoot that. Also it sounds like a pinhole leak has developed in the front section of the exhaust. I'm due to replace the front catalytic converters because I've been getting a 0431 code from time to time (Warm Up Catalyst Efficiency Below Threshold - Bank 2), so hopefully the leak is in parts that will be replaced, but anyway I'll fix it when the cats are swapped. With about 195,000 miles on the clock, I don't feel too bad about needing to replace the cats.
Maintenance update...
I ordered a new transfer case switch, it arrived yesterday and hopefully I'll get time to install it tomorrow. I'll try to post photos of the process in case anyone else needs to solve this problem.
I had the cats replaced today (these are the cats that hang right off the exhaust manifold). Two interesting things:
- One of the cats was empty. Apparently the guts of that cat had burned out and disintegrated. Obvious now why I was getting occasional 0431 cat below efficiency threshhold codes. BTW I had the cats replaced on my 2006 Wrangler pickup (125,000 miles) about two months ago for the same 431 code reason, and one of those cats was empty too. Must be a common failure mode.
- The pinhole leak sound turned out to be the cat pipe connection at the manifold being loose. That must have happened on the rough trail because I first heard the sound on the pavement after the first trail day. Not sure why it took 195,000 miles for it to happen, this Jeep has literally thousands of miles of trail/off pavement miles on it in Colorado, Utah, California, Alaska and other places and many of them rougher than last week's trails. But anyway it's fixed.