Catalytic converters may go bad and plug exhaust on Ford F-350

Catalytic converters can go bad and potentially plug the exhaust, hurting engine efficiency and performance.

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Average mileage: 85,200 (16,000–211,000)
Exhaust & Emissions affected: 7.5L V8
8 model years affected: 1990, 1991, 1992, 1993, more1994, 1995, 1996, 1997
13 people reported this problem
4 people shared problem details
1993 Ford F-35049,000
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.
1990 Ford F-35040,000
after driving for a while when turned off very hard to restart
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
1992 Ford F-350110,000
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.
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