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Ray M.
Ray M., Ford Master Tech
Category: Ford
Satisfied Customers: 3043
Experience:  30+ years in trade, Ford Master Tech, Journeyman Automotive Tech
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08 6.4 squealing/screeching under the hood only on

Customer Question

08 6.4 squealing/screeching under the hood only on acceleration not at idle
JA: Where exactly do you think the noise is coming from? And how long has this been going on?
Customer: sounds like right side of motor...just started this week.....bought the truck 2 weeks ago 74k miles
JA: What is the model of your '08 Ford?
Customer: f350
JA: Are you fixing your F350 yourself? What have you tried so far?
Customer: not sure may take to mechanic...looking for suggestions
JA: Anything else you want the mechanic to know before I connect you?
Customer: that's it
Submitted: 6 months ago.
Category: Ford
Expert:  AMEDEE replied 6 months ago.

Hello and welcome! My name is ***** ***** I can assist you with your question. It sounds like this noise is coming from the serpentine belt or one of the pullies under the hood. I would start by checking the serpentine belt and tensioner to ensure it is holding proper pressure on the belt. If not, replace the belt and tensioner. Some other pullies to check are the AC compressor, alternator and water pump.

Expert:  Ray M. replied 6 months ago.

Hi JA customer

from experience the sound you are hearing is caused by an exhaust leak, check the passenger side manifold and you will find the bolts have broken and the noise is caused by the gasket acting like a reed instrument when the exhaust passes by it. to repair you will need to have the broken bolts removed and replace the bolts and gasket.