2008 F-250/Loud Rumble When I Let Off The Gas

[BrookEastFBCoach]

Hi everyone. Thanks in advance for your help. I bought my first diesel - a 2008 F-250 6.4 PSD a week ago. It is completely stock - including the tire sizes.

I drove it home from where I bought it, covering nearly 1000 miles, and it performed flawlessly - other than the "Drain Fuel Seperator" light coming on. I took it to my local Ford dealership. They told me that "only a bit of crud" came out, and that they would have to replace the whole seperator. They had to order the part. No biggie.

BUT HERE IS THE PROBLEM. Yesterday, I was running errands, driving on a level, paved road @40 MPH. I let my foot off the gas, and I heard a loud sound - sort of like a scraping/grinding noise coming from the front passenger side. The noise went away when I stepped on the accelerator again, but it came right back when I laid off the fuel. I looked in the wheel well and under the truck for foreign objects, but found nothing. Any thoughts? Thanks, Paul

[strivingfirst]

how many miles on it? and how long has it been sitting on the lot before you bought it do you think?

there were issues of moisture building up in the turbo and causing it to rust. Im no mechanic, but im sure someone here can help you out.
here's a

[younggun55]

It was probably just a turbo fart...excess air coming back out of your turbo and makes a gurgling sound

[thw420]

Originally Posted by BrookEastFBCoach

Hi everyone. Thanks in advance for your help. I bought my first diesel - a 2008 F-250 6.4 PSD a week ago. It is completely stock - including the tire sizes.

I drove it home from where I bought it, covering nearly 1000 miles, and it performed flawlessly - other than the "Drain Fuel Seperator" light coming on. I took it to my local Ford dealership. They told me that "only a bit of crud" came out, and that they would have to replace the whole seperator. They had to order the part. No biggie.

BUT HERE IS THE PROBLEM. Yesterday, I was running errands, driving on a level, paved road @40 MPH. I let my foot off the gas, and I heard a loud sound - sort of like a scraping/grinding noise coming from the front passenger side. The noise went away when I stepped on the accelerator again, but it came right back when I laid off the fuel. I looked in the wheel well and under the truck for foreign objects, but found nothing. Any thoughts? Thanks, Paul

Does this '08 have the newer computer program update? Have you seen the "Cleaning Exhaust Filter" message? You will only see the message if you have the newer computer update, otherwise you will get no notification that you are in regen mode (besides less power and strange sounds).

My truck makes a ridiculous gurgling sound if I'm in REGEN mode and let off the accelerator abruptly. This is especially noticeable if a wall or building is to the right right of your truck, as the sounds from the tailpipe bounce off the wall making them pretty loud if you have your windows down.

Mine is not a metal on metal grinding sound, and from what I've read it's normal. Does yours continue to do this today?

[kemp.jerry]

I had a smililar issue come up last summer on vacation. When coming down a steep incline with my 5th wheel on the back, in tow mode: It sounded like you had a shop vac, holding it close to your hand. A very loud sucking sound. It would also do it if I had to get into the throttel hard, like when pulling up a steep grade.

I took it in, and it turned out to be a hole in the turbo intake. They fixed it under warranty, no more problems....