Here I am replying back. Just got one of the catalyst converters replaced. One of them was completely clogged creating a back pressure of 30 psi. Max should be around 2 psi. So I took the car out of the shop got up to 50 miles about 400 yards from the shop that car turned off while driving. So I pulled over to the side and it is acting like it is a dead battery. The starter will turn the engine but only for two seconds. Tried to jump it swamped the batter from another MB but no luck. It acts like it is a dead battery but I know that is not the problem. And the car have been starting right up every time. And I tried to jump it right after it turned off. Very frustarating


When it turned off since the car was still rolling I put it neutral and tried to start the car. I wonder if I ruined the starter!

I dropped it at a mechanic. I am worried it has not messed up the engine. Well, what can I do.

BTW, the muffler guy had never seen a catalytic converter cloged that bad.

But thank you all for your advice.
I feel very disappointed and sad now.