squeal under acceleration!!!Help

[08F350BC]

I have a 08 F350 6.4 and just did the tuner dpf delete and dual flo pro exhaust and now i have a VERY high pitched squeal coming from somewhere!!! It only does it when I accelerate and around 2500 rpm.....when it starts you let off a bit and it goes away...what could that be?

[04blackcrewcab]

Mine does the same thing sometimes, almost sounds like one of the turbos, like maybe the VGT actuating? I think i'm going to rebuild my turbos soon if they're still in decent shape.

[08F350BC]

but it is only at 2000ish rpm....give it the juice and is stops.....let off and it stops....been told it might be a crack in my flex pipe frm the turbo to the exhaust

[kevinah]

Mine used to make that noise at the same rpms(2300-2450) before I Deleted. Since then, I haven't heard it once.


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[08F350BC]

what did you delete?

[kevinah]

Right..... since I deleted the dpf. I always thought it had something to do with regen and towing


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[08F350BC]

I have deleted the dpf and put a aftermarket exhaust on it.....sorry im new at the 6.4

[icecoastfreestyle]

COuld be the pipe, OR it also very would could be the Degas bottle cap... I know my buddies was doing that and I told him that they are all crap caps and ford has a new design out. He went and bought one and it has a much stiffer spring and it keeps the needed pressure in the system, and voila no more noise.
You can buy a Stant one for 5 bucks at Advance Auto or its 13.99 from Ford.
Try that, either way u should change the cap anyways.

[fordmanmark1]

Check for soot @ the flex joint on one of your up pipes! common problem, sound like an old mans hearing aid going off!

[Big_Red_Stroker]

Originally Posted by fordmanmark1

Check for soot @ the flex joint on one of your up pipes! common problem, sound like an old mans hearing aid going off!

number two this morn lol sounds like up pipes to me