Here's the scoop from today with a bit of background first.
Last yr had codes loaded in and saw a cat code so took it in.
The exhaust shop checked it all out and said that there was several codes including o2 code indicating a misfire, a cat code and an o2 sensor fail code.
So they recommeded a tune up first which I did have them do as it was in the shop already. Was a bit shocked due to the high price tag (irridium plugs = $$$) but had it done as the TB was approaching 100k miles. Shop recommended to clear the codes and then see what happens.
Codes showed up again, this time the cat code and o2 sensor fail.
So I had the 02 sensor replaced which required the same guys to abandon the old sensor location because it was rusted in and drilled and welded new threaded collar and installed the new sensor (driver side). Had the codes cleared and then got the cat code back.
I was under the impression that the cat problem was related to having the bad cyl missfire and that the bad exhaust gasses fouled the cat. Because it has not resulted in any significant difference in how the car runs I chose to wait to address the cat.
Took it in today and the guys said it was passenger side cat code. Hmmmm.....well I asked them to do pressure check on each cat fore and aft and they called back and said both cats are........OK - plenty of flow!!!
They reset the codes (I have the dreaded cooling fan low efficiency code now) and see what happens.
So after all of this time I'm wondering if lots of driving possibly has removed any buildup on the cat's screen surface and the cats are now working? What do you think??
As far as the cooling fan clutch - yes I hear the tell tale ticking at startup. When is it time to take care of that before complete fail?? I probably will work on that one myself if possible.
Thanks for the feedback and as always you guys are great!