The catalytic converter may be plugged. Take it to a good exhaust
shop and they can run a pressure test on it. Or, bang on the
catalytic converter with a good sized hammer and try to loosen up
the plugged area. Have you noticed any honey-comb looking stuff coming out of the exhaust? This is the cat's inards coming apart and getting blown out back.
Monday, July 11th, 2011 AT 7:34 PM