Buzzing Noise from Exhaust at Different Engine Speeds on Ford E-350

If a buzzing noise is coming from the exhaust at different engine speeds and conditions, this is commonly caused by the heat shields on catalytic converters coming loose at points. The buzzing is the metal on metal contact. Installing a large worm clamp around the catalytic converter and heat shield assembly will prevent the noise and secure the shields.

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Average mileage: (–)
7 model years affected: 1993, 1994, 1995, 1996, more1997, 1998, 1999
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