squeal under acceleration!!!Help - Ford Powerstroke Diesel Forum
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post #1 of 12 Old 03-01-2012, 04:11 PM Thread Starter
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squeal under acceleration!!!Help

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?
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post #2 of 12 Old 03-01-2012, 08:02 PM
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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.
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post #3 of 12 Old 03-01-2012, 08:18 PM Thread Starter
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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
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post #4 of 12 Old 03-01-2012, 08:28 PM
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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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post #5 of 12 Old 03-01-2012, 08:30 PM Thread Starter
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what did you delete?
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post #6 of 12 Old 03-01-2012, 08:42 PM
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Right..... since I deleted the dpf. I always thought it had something to do with regen and towing


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post #7 of 12 Old 03-01-2012, 08:43 PM Thread Starter
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I have deleted the dpf and put a aftermarket exhaust on it.....sorry im new at the 6.4
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post #8 of 12 Old 03-01-2012, 10:02 PM
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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.

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Mods coming soon!
Came from the dark side(dmax) and am happy so far!
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post #9 of 12 Old 03-02-2012, 03:55 AM
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Check for soot @ the flex joint on one of your up pipes! common problem, sound like an old mans hearing aid going off!

2015 F-350 Platnum FX4 Superduty 4X4 6.7L crew cab Longbed 3.55's 5th wheel prep

Old truck's 95' 7.3 LB EXT 4X4 285,000 miles very much Missed! 08' F-250 6.4 fully deleted

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post #10 of 12 Old 03-02-2012, 04:34 AM
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Quote:
Originally Posted by fordmanmark1 View Post
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

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NEW MOTOR BEING BUILT! motor thats in it right now....7.3,DI stage 4s 350/200s, GT4594 turbo, ZF5 swap, Valair Kevlar clutch, term twins HPOP, 6" lift, 35",Banks IC, DIY 6637 filter, 3.5" down pipe, BDP IDM, TW live tuned chip, BD turbo timer, DIY ladder bars,910 springs, push rods, studs, fuel and airdog I.
SOLD 99 F350 CCLB 6speed 4in down pipe. and banks junk, made 330 on the dyno at 5k feet though. 2.5in leveling kit. custom bumper.
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