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I have a 2008 f-450 with a 6.4 and started hearing a hissing…

Customer Question
I have a 2008...

I have a 2008 f-450 with a 6.4 and started hearing a hissing sound about 3 weeks ago and assumed it was an exhaust leak on one of the braided exhaust down pipes. Figured I'd go after this in the spring, as the truck seamed to run fine. Just hooked the trailer up today to head north and seamed a bit sluggish and eventually got real sluggish and stalled. I pulled over and attempted to start the truck several times....finally it started (almost normal sounding) power was back, although I decided to turn around and head back home...shortly after it started getting sluggish again (loosing power) and then the check engine light came on. I was able to get it into the garage and have started poking around on line to diagnose the problem. Thinking EGR valve?

Mechanic's Assistant: Does the light stay on, or does it blink?

Stays on

Mechanic's Assistant: Are you fixing your F450 yourself? What have you tried so far?

Yes i'll fix it myself......have't tried anything yet figured I'd look around on line before I dive in

Submitted: 4 months ago.Category: Ford
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Answered in 37 minutes by:
12/29/2017
Ford Mechanic: EricFromCT, Ford Technician replied 4 months ago
EricFromCT
EricFromCT, Ford Technician
Category: Ford
Satisfied Customers: 4,572
Experience: 20 years dealership exp., ASE A1-A9 L1 L2, Ford Lincoln Mercury Senior Master, Diesel Certified
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Hi. Welcome to chat! My name is ***** ***** I am currently a factory dealer auto mechanic. I will attempt to assist you with your concern today.

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Ford Mechanic: EricFromCT, Ford Technician replied 4 months ago

First things you should do is to check the lower fuel filter and have the codes checked.

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