Originally Posted by Spenc1tj
Ok I still don't get it. The exhaust was black well before I had the cat hollowed . The exhaust shop hollowed it because it was clogging up. I would not think of hollowing it to make it louder . The hollow one actually sounds like crap because you can hear the exhaust flowing through and almost makes it sound like a leak. So throwing the hollow cat out of the equation and the only code I'm throwing is the ecu having communication problems from a twitchy ground what are the other possibilities? I was thinking plugs, wires and coils would be a good idea but this engine only has 20k miles on it and was installed by LR so that's probably nothing to do with it. I still plan on doing coils,wires and plugs since the engine was installed back in 02 or 03.
I guess I've always figured that all defenders had dark exhaust. Any other suggestion out there?
Perhaps I misunderstood the information,
Here is what I gather,
You had a Check Engine light on since 2002, reset 2 weeks ago
You have a Service Engine light on NOW (which, according to the Owners manual, is a reminder for emissions service)
The 'hollow cat' seems like an interesting choice (I realize it was recommended to you)
The issue is the engine running rich, it seems, and producing carbon.
The temp sensor is a viable solution, I would start there since you have a part number in this thread and its inexpensive ($20)
I am sure if your exhaust is that black, your plugs are filthy, but my suggestion of replacing the o2 and checking the MAF sensor (you can clean them usually) stands as it would cause the symptoms you are describing.
I mean unfortunately you are going to have to wait till the CEL comes on to read the code again and see if one of the sensors is faulty.