The high pitch 6.0 - Ford Powerstroke Diesel Forum
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post #1 of 20 Old 01-08-2012, 07:41 AM Thread Starter
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The high pitch 6.0

I bought the truck in Sept of 2010 coming from a 97 7.3. The truck already had a 4" turbo back on it. Had a high pitch noise then, not knowing if that was how the 6.0 sounded, just drove it. This summer I did the oil cooler, EGR delete, STC, dummy plugs, standpipes, blue spring, 6.4 banjos, ect. I already had flushed and filled with CAT ELC. When I installed the new up pipe for the EGR I noticed the downpipe had a small hole where it was welded to the next pipe. So my question...would this cause the high pitch noise? I looked for soot thinking it could be the y pipe, don't see any anywhere. I know the connection to the turbo is aligned and tight. I do have an exhaust smell on start up in the cab through the vents, which makes me think it is the y pipe, but why NO soot. BTW, haven't used a drop of coolant, no puking, and did replace the degas cap.

2006 F350 CCLB KR FX4

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post #2 of 20 Old 01-08-2012, 01:26 PM
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My truck had a leak at the left exhaust manifold to the turbo intake Y pipe. The previous owner must have tried to remove it at one time and gave up. The bolts were loose and there was an 1/8" gap at that connection. I tackled that repair when I had the engine torn down and the replacement Y pipe was in hand. When the old Y pipe was pulled and inspected, there was an a leak in the braided sections of the pipe as well.


2004 (9/16/03 build) 6.0 FX4 Lariat CC
6.5" Pro Comp Lift with Dual MX6 Shocks up Front, 37" BFG KM2's, Power Slot Cryo Rotors & Hawk Pads, Moog Ball Joints, 4" MBRP SS Turbo Back CAT Delete, Coolant Filter, RCD EGR Delete, Zoodad, Harpoon, blue fuel pressure spring, ScanGaugeII, updated turbo drain pipe
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post #3 of 20 Old 01-08-2012, 01:40 PM
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Yes, a small hole or crack in the up-pipe will make a very high pitched squeal.

My truck has been doing that for awhile and I tracked it down to a split in my passenger side up-pipe.

2005 F-250 CC/SB 4x4 medium wedgewood blue

5" lift, 5" Donahoe rear springs, 35x13.50 Extreme A/T's, 18x10 Ultra Predator wheels, 4.30 gears, Banks 4" exhaust, Airraid intake, SCT from Innovative, ARP headstuds, Bulletproof ficm, Scangauge II, Randy Ellis Design lightbar, Street Scene flares, Harpoon mod, Zoodad mod, LED 2010 taillights, dual color LED front turn signals, Pioneer avic-D3 with ipod and backup cams
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post #4 of 20 Old 01-08-2012, 02:44 PM Thread Starter
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Quote:
Originally Posted by GregsSD View Post
Yes, a small hole or crack in the up-pipe will make a very high pitched squeal.

My truck has been doing that for awhile and I tracked it down to a split in my passenger side up-pipe.
The hole that I know about is at the bottom of the downpipe where it meets the next section of pipe.

2006 F350 CCLB KR FX4

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post #5 of 20 Old 01-15-2012, 10:09 PM
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Does it only happen on a cold start up? Mine has started making a strange whistle on start then goes away..

Last edited by Ripping Trends; 01-15-2012 at 10:10 PM. Reason: content
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post #6 of 20 Old 01-17-2012, 04:45 PM
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mine does it just about every start up . its about five to ten seconds after fire up ..?its simultanius with the turbo vanes closing ...chripppp
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post #7 of 20 Old 10-04-2015, 07:23 PM
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Just bumping this, as mine is doing the exact same as last two posts, and this theead came up when I searched. Figured others may be in same boat. Thanks.
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post #8 of 20 Old 10-04-2015, 07:36 PM
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We need vids

GD - 06 CCSB FX4 Lariat
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Originally Posted by G8orFord View Post
My magic wand broke a few years back when my crystal ball fell on it. Ruined the ball too. So we're going to have to figure this one out another way. YOU NEED A MONITOR or at least a good scanner.
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post #9 of 20 Old 10-05-2015, 10:19 AM
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My truck did not make the noise on startup this morning (ambient temp around 50* F, oil and water temps about the same)

I will try to shoot a video of in the cab next time it does it.

I had the turbo and y pipe out about 10k miles ago. Did the one piece egr delete with new up-pipe (and studs and HGs).

Been searching for an odd vibration ever since also. Only happens at idle. Some times it sounds like an oscillating vibration (best i can describe).

The high pitch squeal is new. It goes away once you give it some throttle. No decrease in power or fuel mileage.
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post #10 of 20 Old 10-05-2015, 05:26 PM
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we need more than chirpping noises vidieos will help
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-Tom

05 250 KING RANCH CCSB,278k,ARP's,SCT TSX,Atlas 40,STC done,Glowshift FP Gauge,Banks IC System,Blue Spring,Banjo's,CCV mod,Oil Bypass,Diamond Eye 5" Exhaust,Bilstein 5100's,RC Dual Steering Stabilizer,Retro 55W 6k Heads 3k Fogs,Continental Airbags,RSD 48 gal Aux Fuel Tank.





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