QUOTE (2000Sable @ Jun 7 2010, 05:02 PM)
Which you shouldn't have had to do except the Windstar must have been running like crap to do that. The cats don't clog unless another tuning or severe oil leak, or blown head gasket happens first, unless you get unlucky and they hit with junk on the highway.[/b]
The poor Windstar had seen better days when I beat the cores out of the cats, the 3.8 had some issues as a production engine but the one in my 96 Windstar went 200k without having a single major repair. She was traded in at 200k miles and she ran like a top as far as the car salesman knew. I got $700 for her. She just didn't have much for cats left at that point. So yes, a cat will clog over time. Nothing major has to occur, just time and miles. Lots and lots of miles.
PS. The transmission was a AXOD and she was untouched and original... She was a tank. God I loved that van. /sniff
Again cats do not clog over time. They clog when something goes wrong and it is left unfixed. None of my cats have ever clogged without something going wrong first. My Mazda was the only vehicle that ever had the cats clog up, it had a distributor go bad when my dad owned the truck. He was out of town and had to drive 500 miles with only two cylinders. The cats didn't like that very much, melted right down.
My dad's Ranger has 320,000 miles, original cats, his Dakota with 340,000 drove for 200,000 miles with low compression, but still has the original cat. My dad used to have a Chevy Prism, it went over 400,000 miles on the original cat. My Aerostar has 240,000 miles with the original cats. The cats that plug are on the vehicles that are not kept properly maintained. By properly maintained, that means keeping it to the factory specs as outlined in the owners manual, including replacing the O2
sensors at 80,000 miles. Most people forget that O2
sensors are maintenance items.
Again, back to the original topic, your symptoms are not consistent with a plugged converter. Furthermore, you will most likely get a P0420 or P0430 code before the cats plug anyway. If you do not have a converter code, then converters belong really low on your list. I have seen a weak fuel pump that closely matched your symptoms. The pump works fine when cold, but as the pump heats up, it loses power.