Catalytic converters can go bad and potentially plug the exhaust, hurting engine efficiency and performance.
Average mileage: 85,200 (16,000–211,000)
Exhaust & Emissions affected: 7.5L V8
13 people reported this problem
Viewing 1 - 4 of 4 comments
after driving for a while when turned off very hard to restart
Bogged down. overheating. very poor performance. Eventually could only get up to 5 miles per hour. disconnected catalytic converter. problem went away. Replaced catalytic converter. works great now.
Cat plugged. Engine died and would not run. Loosened the exhaust to drive to muffler shop. New cat cost an arm and leg because it is a special one. Haven't had the problem since.
When i hit the gas it sounds like a engine knock really noticeable in 3rd to 5th gear smell of exhaust is strong in the cab and has no power