My brother had an 85 190e 2.3 and the cat got plugged up, car was smoking and had no power.
I think I would look into the cat to see if its ok.
Thats my opinion on it, and I'm not a tech.
'92 300CE - Sold
2004 C240 - C7 Wheels
2015 ML350 - P1, Pano, Ash poplar wood, Sport Dinamica interior, Running Boards Keyless go.