V70: Engine - Screeching noise - not PCV.

SeftonCR · Jul 12th, 2022, 11:49

Hi All

Hopefully someone can shed some light on this one.

My 09 plate V70 2.5T has a nasty screeching sound, particularly at startup. It then reduces but can be heard if accelerating.

It almost sounds like a drive belt - but it's not. That's been checked by tame mechanic.

It's not the PCV problem. Sounds similar but I had that go a few months ago (I was convinced it was a pulley until mechanic said "watch this" with a grin & removed the filler cap.)

Car drives fine, no oil leaks. 22mpg around town (ouch) and 30++mpg on motorway.

Any ideas folks?

SeftonCR · Jul 12th, 2022, 16:59

I've just taken a quick video so you can hear what it sounds like - not that clear over the normal engine noise but it's that screechy, whirring noise that you can detect in the background.

https://youtube.com/shorts/KfF1pT8M-ZQ

ferg55 · Jul 12th, 2022, 20:51

I can't hear the video due to speaker problems, but I understand the power steering pump will screech loudly on start up, in a pulsing fashion around once a second, if the reservoir level is too low. Regardless of any steering input. There is a youtube of it but I couldn't find it.

SeftonCR · Jul 12th, 2022, 21:59

Quote:

Originally Posted by ferg55

I can't hear the video due to speaker problems, but I understand the power steering pump will screech loudly on start up, in a pulsing fashion around once a second, if the reservoir level is too low. Regardless of any steering input. There is a youtube of it but I couldn't find it.

Thanks Ferg, not that unfortunately.

You can also hear it when you put your foot down after bimbling along in traffic for example, it's not just start-up although that seems worse.

37 RUBY · Jul 13th, 2022, 07:53

Hello

Impossible to diagnose from a distance or via video

Possible culprit could be the freewheel clutch pulley on the alternator. I'd remove the alternator belt to isolate that pulley, then same again with aircon belt.

After that it's mechanics stethoscope time.

SeftonCR · Jul 28th, 2022, 15:49

Ah-Ha!

Confirmed as exhaust manifold leak. Waiting for gasket & a slot when I can get it in. Fingers crossed that'll be the fix...

Jul 12th, 2022, 11:49	#1
SeftonCR Confused until Coffee Last Online: Jan 22nd, 2024 17:17 Join Date: Mar 2010 Location: Liverpool	Screeching noise - not PCV. Hi All Hopefully someone can shed some light on this one. My 09 plate V70 2.5T has a nasty screeching sound, particularly at startup. It then reduces but can be heard if accelerating. It almost sounds like a drive belt - but it's not. That's been checked by tame mechanic. It's not the PCV problem. Sounds similar but I had that go a few months ago (I was convinced it was a pulley until mechanic said "watch this" with a grin & removed the filler cap.) Car drives fine, no oil leaks. 22mpg around town (ouch) and 30++mpg on motorway. Any ideas folks? __________________ 2009 V70 2.5T : Past includes a 240, 740, S60, S80, 850 T5 & V70 T5 - sold to fund wedding - still married as it happens but she's not failed an MOT yet... Please help pay my beer & petrol bill by buying art, collectibles & vintage stuff here. Last edited by SeftonCR; Jul 12th, 2022 at 12:02.

Jul 12th, 2022, 16:59	#2
SeftonCR Confused until Coffee Last Online: Jan 22nd, 2024 17:17 Join Date: Mar 2010 Location: Liverpool	I've just taken a quick video so you can hear what it sounds like - not that clear over the normal engine noise but it's that screechy, whirring noise that you can detect in the background. https://youtube.com/shorts/KfF1pT8M-ZQ __________________ 2009 V70 2.5T : Past includes a 240, 740, S60, S80, 850 T5 & V70 T5 - sold to fund wedding - still married as it happens but she's not failed an MOT yet... Please help pay my beer & petrol bill by buying art, collectibles & vintage stuff here.

Jul 28th, 2022, 15:49	#6
SeftonCR Confused until Coffee Last Online: Jan 22nd, 2024 17:17 Join Date: Mar 2010 Location: Liverpool	Ah-Ha! Confirmed as exhaust manifold leak. Waiting for gasket & a slot when I can get it in. Fingers crossed that'll be the fix... __________________ 2009 V70 2.5T : Past includes a 240, 740, S60, S80, 850 T5 & V70 T5 - sold to fund wedding - still married as it happens but she's not failed an MOT yet... Please help pay my beer & petrol bill by buying art, collectibles & vintage stuff here.

Jul 12th, 2022, 20:51	#3
ferg55 Senior Member Last Online: May 27th, 2024 22:25 Join Date: Feb 2013 Location: oxford	I can't hear the video due to speaker problems, but I understand the power steering pump will screech loudly on start up, in a pulsing fashion around once a second, if the reservoir level is too low. Regardless of any steering input. There is a youtube of it but I couldn't find it.

Jul 13th, 2022, 07:53	#5
37 RUBY Master Member Last Online: Apr 24th, 2024 20:45 Join Date: Jun 2017 Location: Chesterfield	Hello Impossible to diagnose from a distance or via video Possible culprit could be the freewheel clutch pulley on the alternator. I'd remove the alternator belt to isolate that pulley, then same again with aircon belt. After that it's mechanics stethoscope time.

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