Buzzing noise while running
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New User
Joined: Oct 2019
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Yeah have done lots of that to no avail. Unbolted the dipstick tubes from their mounts and held them up and out of the way with no change too.
Fleet Mechanic
Joined: Mar 2021
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Make sure you are careful and seat everything correctly and prime properly etc etc. and you should be good to go.
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New User
Joined: Oct 2019
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New fuel filters purchased straight from dealer installed, rigorous priming procedure completed. Installed new lower filter, key on/off cycled about 15 times until no air could be heard. New engine mounted filter installed, same key on/off procedure. Started it up, no change.
Fleet Mechanic
Joined: Mar 2021
Posts: 1,454
Likes: 606
New fuel filters purchased straight from dealer installed, rigorous priming procedure completed. Installed new lower filter, key on/off cycled about 15 times until no air could be heard. New engine mounted filter installed, same key on/off procedure. Started it up, no change.
Can you get a better look and listen from under the truck?
You have a mechanic's stethoscope?
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Nothing loose or leaking as far as I've been able to find. I'm thinking possibly coming from the turbo? Or maybe from the CP4 because one of the metal fuel lines has a vibration you can feel with a screwdriver.
Fleet Mechanic
Joined: Mar 2021
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Wish I had better ideas but hard to say. If you don't have a mechanic stethoscope they are worth their weight in gold. I would think if it were the turbo itself it would modulate and not be a constant noise. Do you have a competent diesel shop in your area?(and I don't mean a Ford dealer).
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New User
Joined: Oct 2019
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It sounds like it's coming from the area between the fuel filter and turbo, might end up taking it to ford, I have about 2 weeks left on my 150,000 mile warranty.
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Are there any valves that open about 20 seconds after high idle start? Maybe the vgt vanes on the turbo? I ordered a new lower filter housing on the off chance mine is cracked or leaking. Forscan shows that desired high-pressure fuel = actual high-pressure fuel at idle/high idle/ while driving. Low-pressure fuel is about 400 KPA actual and about 600 KPA desired- thinking this might be playing into the noise but not 100% sure. No stored or pending codes and all injectors reading good. Balance rates all within 0.1 MG of each other which steers me away from the CP4 having a problem.
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