About three weeks ago I was on the highway doing about 70 mph suddenly the car lost power, I drove it to the shop that does my tuning. They have checked for vac. leaks none, smoked it no connections on the s/c are loose, they thought it was the throttle body, that's not it either,they said there are no codes but the fuel trims are all crazy, its running real rich, they are now thinking it may be the cats clogged up, I have Pypes hi flow on it. Any other ideas.

 

Update the cats are find, he going too put it on the dyno monday to try and figure it out. He's kind of stumped, he is one of the best tuners in the country on Mustangs I'm sure many of you have heard of him or know him in the Chicagoland area, prior to that he was in Ga. Any suggestions would be appreciated.

 

How many miles on the cats? If you're running ceramic cats, you've probably melted them. Need to run metallic cats for SCs. Ask them to fix your fuel maps and also try turning the rear O2s off entirely.

The sensors that affect fuel maps are before the cats so my guess is there is a tune issue.

 

If emission testing wasn't required in your area I'd just cut the bastards out completely. I have an off road x with straight pipes out the back, I just lean it out and the sniffer doesn't notice the difference. And like Jcon said try tuning out the rear o2's.

 

I have Mettalic cats, we checked them they were good.