Squeal While Accelerating - Ford F150 Diesel Forum
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post #1 of 11 (permalink) Old 01-19-2020, 09:51 PM Thread Starter
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Squeal While Accelerating

Anyone ever have an audible squel/modulating shrill sound when accelerating after truck has been running for a while? It is most noticeable on the highway when cruising and accelerating. Somewhere around 1500-2000 rpm. See attached video. I was extra careful while driving and recording.

https://drive.google.com/file/d/1HXX...w?usp=drivesdk

This sound is driving me nuts. I thought it was a vacuum leak so I replaced the 4x4 check valve and solenoid. This did not fix it. Let me know what you think.
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post #2 of 11 (permalink) Old 01-19-2020, 10:19 PM
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that's an odd sound, at first I thought turbo.. based on the high frequency but your boost/rpm's don't change..

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post #3 of 11 (permalink) Old 01-20-2020, 02:40 PM
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@fharrison - can you tell whether the noise is coming from the interior or the exterior? (Sorry I can't tell from your video)

It reminds me of the fan going bad in my laptop, because it's definitely a sound coming from something cyclical, but the fact that it comes and goes (not constant) makes me think it is not coming from the engine bay. Try turning off all climate control (heat or air conditioning) to see if it goes away...

I agree (from just the 30 seconds of the video you posted) that this would also drive me nutso....

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post #4 of 11 (permalink) Old 01-20-2020, 03:26 PM Thread Starter
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@fharrison - can you tell whether the noise is coming from the interior or the exterior? (Sorry I can't tell from your video)

It reminds me of the fan going bad in my laptop, because it's definitely a sound coming from something cyclical, but the fact that it comes and goes (not constant) makes me think it is not coming from the engine bay. Try turning off all climate control (heat or air conditioning) to see if it goes away...

I agree (from just the 30 seconds of the video you posted) that this would also drive me nutso....
It's not very evident but the sound is only while accelerating. You can kind of see the rpms increase. When I let off the throttle, it stops. It is definitly coming from the engine bay. I can hear it with the window down. I also noticed recently that i can smell diesel exhaust briefly in the engine compartment when starting up. Wonder if this could be a cracked manifold causing the whistle/squeal. I just cant find any soot buildup but the manifold is mostly concealed.
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post #5 of 11 (permalink) Old 01-20-2020, 03:27 PM Thread Starter
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Also, it does not start making this sound right away. Only after the engine has been running for a while.
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post #6 of 11 (permalink) Old 01-20-2020, 04:43 PM
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@fharrison - OK, should have gone back and read the title of your post after watching the video... So when it is "whining" is when you are stepping on the accelerator?

This is my first turbo, so I am no expert, but the turbo will spool up when you accelerate, so that would by my first guess (like @Jgleadle mentioned previously) Are you monitoring Turbo boost via FORScan PIDs or via the IPC (pretty sure there is a setting in there to make one of the small IPC gauges display Turbo Boost) not that we know what to be looking for (maybe loss of boost due to leak in turbo?)

The sound is definitely not normal -- I know you are probably tired of going to your dealer by now, but I think this is an easy one to recreate while taking the Service Manager hostage for a test ride, and let them diagnose & repair while under warranty.

I must say that you definitely have the record for these one-off issues that no one else is experiencing (DPF Piping, vacuum leak around turbo donut, etc.)

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Last edited by jmperlik; 01-21-2020 at 09:49 AM.
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post #7 of 11 (permalink) Old 01-20-2020, 05:13 PM Thread Starter
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@fharrison - OK, should have gone back and read the title of your post after watching the video... So when it is "whining" is when you are stepping on the accelerator?

This is my first turbo, so I am no expert, but the turbo will spool up when you accelerate, so that would by my first guess (like @Jgleadle mentioned previously) Are you monitoring Turbo boost via FORScan PIDs or via the IPC (pretty sure there is a setting in there to make one of the small IPC gauges display Turbo Boost) not that we know what to looking for (maybe loss of boost due to leak in turbo?)

The sound is definitely not normal -- I know you are probably tired of going to your dealer by now, but I think this is an easy one to recreate while taking the Service Manager hostage for a test ride, and let them diagnose & repair while under warranty.

I must say that you definitely have the record for these one-off issues that no one else is experiencing (DPF Piping, vacuum leak around turbo donut, etc.)
I am beginning to think I am cursed. I do love this truck though.

I did not think about turbo boost possibly leaking. I will check my connections and make sure they are tight tonight. The fresh burned diesel smell has me concerned since I do not have a delete, it should not smell like that, especially in the engine bay.
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post #8 of 11 (permalink) Old 01-21-2020, 09:19 AM
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Not that I am 10% sure this is correct.. but you may want to check the EGR components.. They have been know to crack from older vehicles from what I have read in the past... Again.. I am Parroting here... but hope you figure it out soon.. sounds like a trip to the dealer is eminent.

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post #9 of 11 (permalink) Old 01-21-2020, 06:59 PM
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Quote:
Originally Posted by fharrison View Post
Quote:
Originally Posted by jmperlik View Post
@fharrison - OK, should have gone back and read the title of your post after watching the video... So when it is "whining" is when you are stepping on the accelerator?

This is my first turbo, so I am no expert, but the turbo will spool up when you accelerate, so that would by my first guess (like @Jgleadle mentioned previously) Are you monitoring Turbo boost via FORScan PIDs or via the IPC (pretty sure there is a setting in there to make one of the small IPC gauges display Turbo Boost) not that we know what to looking for (maybe loss of boost due to leak in turbo?)

The sound is definitely not normal -- I know you are probably tired of going to your dealer by now, but I think this is an easy one to recreate while taking the Service Manager hostage for a test ride, and let them diagnose & repair while under warranty.

I must say that you definitely have the record for these one-off issues that no one else is experiencing (DPF Piping, vacuum leak around turbo donut, etc.)
I am beginning to think I am cursed. I do love this truck though.

I did not think about turbo boost possibly leaking. I will check my connections and make sure they are tight tonight. The fresh burned diesel smell has me concerned since I do not have a delete, it should not smell like that, especially in the engine bay.
My previous truck was a 3.5 Ecoboost and did exactly what you are describing. It was a warped exhaust manifold which caused an exhaust leak. Traded the turd in for a 3.0 diesel!

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post #10 of 11 (permalink) Old Yesterday, 05:58 PM Thread Starter
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Issue should be solved. I crawled all over the engine and found the pipe connection from the exhaust manifold to the back of the egr had a stripped bolt. Must have been from a previous replacement. Found soot at the connection which was the telltale sign. I think the squeal was the leak through the gasket. Took it to the dealer and they found the egr is not repairable due to it being stripped. This will be my 4th egr replacement.

There is not much room to see around these engines. I was first concentrated on manifold to engine connection and there is just no way to see all 6 of those. From what I could see, they were clean. Glad I decided to get back far enough to see the back of the egr. It was obvious and the bolt just turned in place.
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