SHOrod
Torrie Tuned
Actually, the electric power steering would seem more likely than the alternator since the frequency and amplitude is unrelated to engine speed....
2015 SHO, When cold, weird squeal comes from engine. VIDEO Attached
- Thread starter SmittyGeno
- Start date
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ridered74
SHO Member
- Joined
- Mar 27, 2015
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I had a weird squealing at start up a few years ago, it happened immediately after loading a new tune and would happen every single morning for a minute or two and then stop. I sprayed the tensioner pulley with wd 40 and it went away for a couple weeks. Every time it would come back and i'd spray with wd40.
The weird thing is I switched tuners a year later and it's been 2.5 years and I've never had that squeal again since then.
The weird thing is I switched tuners a year later and it's been 2.5 years and I've never had that squeal again since then.
yaycandy
Aerospace Engineer
Maybe it was the cold idle rpm. I know i adjusted mine to make noise and rattles go away. Even after AD mounts
ridered74
SHO Member
- Joined
- Mar 27, 2015
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I don't think so because it kept making the noise constantly while driving. It would stop after a mile or two. Weirdest f'n thing.
Kowens1231
New Member
I have a 2013 MKS with 35k miles... and I hear this same noise. not a pulley because the sound does not increase with revs. and I've removed my redirection hoses so you can hear the woooshie noises haha same with or without them connected. I'm a Volvo technician and although the noise is different this sounds very much like a bad breather box on pretty much any model volvo. Breather box, Vent box, oil sepperator PCV system... everything we have is stamped FoMoCo old to brand new 2022. so it would make sense that this could be it. Volvo doesn't have a "traditional" pcv valve so possibly why the sound is different but we do have a oil sepperator with a removable pcv valve. with a 5 dollar valve replacement it's a good place to start
SHOrod
Torrie Tuned
Very interesting. I think that's next on my list. This morning I connected my ChassisEar to each of the wastegates and the ChassisEar did need seem to pick up the noise there, even though I could hear the chirp outside. So I'll check the breather box tomorrow morning. Thank you for the suggestion. I wish mine would make the noise at idle like the Volvo, that would sure make it easier to diagnose the source.
-Rod
-Rod
Kowens1231
New Member
I went and ordered a valve today they originally tried to sell me a 70dollar pcv valve but the ones for our cars comes up as a valve with an electrical connector. ours is this just a plain 7 dollar valve.
AA5Z-6A666-D
SHOrod
Torrie Tuned
That would be REALLY awesome if a $7 part fixed this annoying noise....
-rod
-rod
Kowens1231
New Member
swapped it out earlier this week to no avail back to the drawing board
SHOrod
Torrie Tuned
This morning I had my ChassisEar on the PCV valve, the oil separator body, and the ABS pump. I could hear the noise on the ABS pump microphone and on the oil separator body, but the microphone on the PCV only clicked like fuel injectors or the GDI pump, but no chirp. The chirp seems most noticeable at the ABS pump, so I think I'm looking for something in that area of the engine compartment, or possibly still the ABS pump.
My new PCV valve should be arriving this week so I plan to replace it anyway.
-Rod
My new PCV valve should be arriving this week so I plan to replace it anyway.
-Rod
SHOrod
Torrie Tuned
I'll see if I can capture the sound through the ChassisEar. It's very much a chirping sound like a dry rubbing metal at a relatively constant high frequency or a relay or solenoid that's switching at a high frequency. The amplitude and frequency does not change much at all, certainly not in relation to vehicle speed or engine speed. It also doesn't seem to be related to engine load since if makes the noise if I'm accelerating and often continues (at the same amplitude and frequency) if I let off the accelerator. Changing gears also does not change the amplitude or frequency noticeably. Definitely getting a video clip will be helpful since so many folks seem to suggest a belt or pulley issue. I may pull the fuse for the ABS pump to see rule that in or out in a hurry.
FWIW, I spent most of my childhood through my first couple of years of college working at my parent's auto repair shop (Mom would take me there after picking me up from half-day preschool and I continued working there after school, on weekends, and during the summer) so I've experienced more than my fair share of belt noises, pulley issues, brake noises, driveline noises, etc. I'm not saying this to suggest I know everything, but to help explain why I'm confident this is not a belt or pulley issue.
-Rod
FWIW, I spent most of my childhood through my first couple of years of college working at my parent's auto repair shop (Mom would take me there after picking me up from half-day preschool and I continued working there after school, on weekends, and during the summer) so I've experienced more than my fair share of belt noises, pulley issues, brake noises, driveline noises, etc. I'm not saying this to suggest I know everything, but to help explain why I'm confident this is not a belt or pulley issue.
-Rod
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SHOrod
Torrie Tuned
I've uploaded a few videos of the sound to my Google drive. If you get motion sickness you may not want to watch the video, but rather just listen to the audio. I probably won't keep them out there real long, so if the links don't work it's probably because I've deleted the videos. My phone picks up too much wind noise if I have the window open, so the sound is kind of muted for the first two clips. But I think it shows how sporadic the sound is, and shows that it's not related to engine speed or vehicle speed. The first clip the noise is present under load, but it also makes a blip of the sound even while coasting.
drive.google.com
The following clip also shows that it the noise typically occurs under load, but doesn't really change with vehicle or engine speed.
drive.google.com
And this next clip helps demonstrate that it comes and goes abruptly, it doesn't seem to fade in or fade away. This was recorded using my wireless ChassisEar with a microphone mounted on the ABS Hydraulic Control Unit (HCU). This seems to be where the noise is most pronounced. Used HCUs are relatively inexpensive and I have the scan tool to program a bleed a replacement, so I may start by flushing my brakes to see if that makes a difference. If not, then I may replace the HCU with a used unit to see if that takes care of the noise.
drive.google.com
-Rod
20211104_073027.mp4
drive.google.com
The following clip also shows that it the noise typically occurs under load, but doesn't really change with vehicle or engine speed.
20211103_073247.mp4
drive.google.com
And this next clip helps demonstrate that it comes and goes abruptly, it doesn't seem to fade in or fade away. This was recorded using my wireless ChassisEar with a microphone mounted on the ABS Hydraulic Control Unit (HCU). This seems to be where the noise is most pronounced. Used HCUs are relatively inexpensive and I have the scan tool to program a bleed a replacement, so I may start by flushing my brakes to see if that makes a difference. If not, then I may replace the HCU with a used unit to see if that takes care of the noise.
20211105_072759.mp4
drive.google.com
-Rod
Kowens1231
New Member
haha yup that's the sound
SHOrod
Torrie Tuned
You mention you also have a 2013 MKS. If you get a chance, would you see what model ABS HCU your car has? Mine is stamped DG13-2C405-AF, but according to most of the fitment guides, this should be on a Taurus, not an MKS. The MKS-compatible part seems to be DG13-2C405-AD. I don't see marks on the brake line fittings to suggest the HCU has ever been replaced so I assume I would want to replace it with another -AF.
-Rod
Kowens1231
New Member
also AF not AD
SHOrod
Torrie Tuned
Great info, I appreciate the help. If/when I replace the HCU I'll let you know if that solves the noise or not. My ChassisEar sure suggests that the noise is coming from the HCU. I located 4 microphones in the immediate area of the HCU and still the loudest sound came from the microphone mounted directly on one of the lines from the master cylinder to the HCU. Also, using my scan tool, I independently activated the isolation valves of the ABS system and activating the LF isolation valve made a similar, but much less audible, noise. When activating the other isolation valves I would hear a click, but now chirping sound. So I really think I'm on the correct path. However, I've thought that before too.
-Rod
Kowens1231
New Member
My brake fluid was as a nice orange color not sure what color it's supposed to be from ford but clear/yellow and dirty black is all I've ever seen on any car. so I flushed it with volvo dot 5.... haven't heard the noise at all since ... here's hoping
SHOrod
Torrie Tuned
You beat me to trying that, and I'm very encouraged by your results. Flushing my brake system may have just ratcheted up my To Do list a few spots. Thank you for continuing to keep us updated!
-Rod
SHOrod
Torrie Tuned
Well, my experiment from the past couple of days has me confused again. I removed all three fuses for the ABS. With all fuses removed, the noise still occurred. It actually may have been a bit worse with all fuses removed. Normally I only hear the noise once per day, after the car has been sitting several hours. With the fuses removed, it would make the noise every time I drove the car, such as first time in the morning, then when I took my son to his school concert in the evening, then on the way home from the concert, and again when headed to the grocery store in the evening after the concert. Unless it's something mechanical with fluid flowing in or through the ABS system, I don't know how it could still be present will all power removed. Unless there's yet another fuse that doesn't show up in wiring diagram for the HCU.
-Rod
-Rod
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