Buzzing Noise in Muffler or Exhaust System on Ford E-350

Problem Description and Possible Solution

Broken pieces from catalytic converter can travel to the muffler and rattle, causing a buzzing noise to be heard in the muffler or exhaust system. The exhaust catalytic converter and muffler/pipe assemblies should be replaced.

Problem Data
RepairPal Verified
Average mileage: (–)
Exhaust & Emissions affected: 5.4L V8
2 model years affected: 2004, 2005
2 people reported this problem