Engine bay whistle at high boost - Ford Powerstroke Diesel Forum
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post #1 of 31 Old 12-10-2019, 12:01 PM Thread Starter
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Engine bay whistle at high boost

I have a small probably not critical issue that has come up and I wanted to post it up on here to see if anyone has had this problem before and has some insight on what to look for.

At high boost (30+) under load I have a distinct loud whistling noise coming from my engine bay. I noticed it for the first time this weekend pulling my boat up a long steep hill. I was cruising along at about 60 and got to a steeper part and the engine kicked down a gear and the boost started building and the whistling started. The interesting part is it also seemed to matter how fast I was going because as I slowed down the whistle went away but the boost stayed the same. I tried to replicate it on flat ground but it seems that the hill/high load had something to do with it too.

I plan to check the exhaust bellows and go over my intake connections to see if I can find something loose or torn but with it only doing the whistling at high boost and high load its kind of a hard issue to replicate to check to see if it is solved. Has anyone else had something like this happen ever?

Info on the truck: 06 with EGR delete, SCT +65 tune, CST EDGE INSIGHT, 5" Straight pipe, New OE turbo with less than 25k on it.

EDIT: I should also add that I have had an intake leak in the past where my intercooler-in coupler blew out of the clamp and this sounds similar but vastly milder, hence me going to check the intake connections for leaks. Maybe its time to run a lower boost tune...

Last edited by Tanker_01; 12-10-2019 at 12:06 PM.
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post #2 of 31 Old 12-10-2019, 01:57 PM
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If its not exhaust, or a slipping water pump pulley, you can check with a boost detector. You can order one from diesesite, or around half the price fashion one yourself from a rubber pipe cap from home depot and a worm clamp, plus various air adapters. I spent so much chasing an exhaust leaks and boost leaks down, and I found them, but the high pitched squeal I heard was from a slipping water pump pulley. If yours souns like that, may want to start there. Very cheap repair. You remove the pulley and scuff it, and fixed.

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post #3 of 31 Old 12-11-2019, 05:45 AM Thread Starter
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That definitely sounds similar to mine but mine only will do it if it is under heavy load towing, which wouldn't make sense since the belt drive has nothing to do with the load on the engine. nevertheless I will go ahead and scuff that pulley when I get a chance just to eliminate that as an issue.

The leak I had solved a while back I did not replace the coupler just put it back on and tightened it. It is entirely possible it is still leaking at high boost, the sound sounds really similar to when that was leaking. I will replace that coupler with a brand new one and I am going to go over all my other intake connections. I also was thinking that it could possibly be my air filter pre-filter cover making noise when under high boost (cold air intake). Ive had a similar noise from a restricted cold air intake before on my old silverado.
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post #4 of 31 Old 12-11-2019, 07:10 AM
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My whistle only appeared going up a 6% grade and towing my 11k fifth wheel. It gradually got worst, but only pushing the engine while towing, never slick. BPD used to have a pdf on their website that explains how to do this, but its been removed. There's some things on google about a glazing on the water pump pulley doing this. I used 3m pads on the drill to take off the glaze.

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post #5 of 31 Old 12-15-2019, 01:46 PM
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I had the same on my 03 6.0l high pitch whistle while towing up a steep grade it eventually got worse and lost speed and power while towing hills ! Turns out it was losing boost from a crack in my Y-Pipe ,check bellows and exhaust.
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post #6 of 31 Old 12-15-2019, 03:49 PM
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Did you ever install a coolant pressure gauge as was discussed in this thread?

https://www.powerstroke.org/forum/ge...l#post16350037

If not, you should.

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post #7 of 31 Old 12-20-2019, 10:41 AM Thread Starter
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I have not. I did bring it to a guy and have him pressure test my coolant system. Both cold and at operating temp. At cold he pushed pressure into it while the engine was off to see if there were any leaks and it did not lose pressure or fluid. At operating temp running he had me put the truck in drive and hold it at 2500rpm for 5 mins while checking to see if the pressure rose at all during that time and it built less than 0.2psi over the 5 mins. He concluded that my coolant system has no leaks and is not being pressurized by exhaust gasses.

As an update to this thread I recently drove my truck over 250 miles round trip on highway and residential type roads and did not hear the noise at all. Before I went I went through and tightened all of my intake connections. It seems the issue has been solved by tightening the clamps.

I also have been paying close attention to and checking my coolant tank. It seems that it really does move a lot more than stock. At operating temp (over 180 ECT) It sits right above the low mark in the degas bottle, at stone cold (20 Ambient temp) it sits about 1-1.5 inches above the bottom of the tank. You can hardly see there is any coolant in there when its cold. I think I just thought it was empty before because I didnt look hard enough for fluid. I did add a gallon of coolant but I filled it up above the low mark and it did push some out right after I added it. I am pretty sure I was deluded and fearing the worst at first and that nothing was really wrong at all.
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post #8 of 31 Old 01-02-2020, 06:15 AM Thread Starter
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Ok so some development on this issue. I have ordered a new belt and tensioner to eliminate that as an issue. I have however discovered that the sound definately only happens when I am building boost and only occurs around 15-20psi and continues on up to max boost. I think I have a leak on the charge pipe system somewhere. I noticed also that my silicone coupler that connects the turbo to the first charge pipe is not an elbow connector like it is supposed to be. I also think it may be too short. I am going to try to replace that first as well as go through the other silicone connectors and make sure they are all connected properly. I have a Banks intercooler and an aftermarket charge pipe system with giant 3" pipes. Is there anywhere on the charge system that is common to start a leak? Is there anything else to check?
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post #9 of 31 Old 01-02-2020, 08:40 AM
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You can do a boost leak pressure test through the turbo. Dieselsite sells one. Itís not to easy to see under pipes for leaks, but youíll hear them with a pressure check.

2005 F250, 189,000 Miles
Bullet Proof HD Oil Cooler w/ Cold Weather Kit, Bullet Proof EGR, Bulletproof Water Pump, 7.3 Fan Clutch
Airlift 5k Airbags and Wireless Air
Edge CTS w/ EGT probe and Fuel Pressure Sensor.
15 MPG slick; 10 MPG towing 11k fifth wheel
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post #10 of 31 Old 01-02-2020, 08:48 AM Thread Starter
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Quote:
Originally Posted by ChrisSki View Post
You can do a boost leak pressure test through the turbo. Dieselsite sells one. Itís not to easy to see under pipes for leaks, but youíll hear them with a pressure check.
I will look into that, that might be a good route to go. I asked my Dad about it (he is a long time 6.0 owner and former Navistar Engineer) and he said to check my egr block off plate and my intake studs to make sure they are all tightened down. I had him come over and listen to it and he said it definitely sounds like an intake charge system leak. He also said it probably isn't anything major since I'm still building 30+psi of boost easily its probably just a pinhole somewhere. A damn annoying ear piercing pinhole though.
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