2005 S80 AWD weird whining noise coming from engine

Help, Advice, Owners' Discussion and DIY Tutorials on the Volvo S80 model. Sometimes called an "executive car", the S80 was and continues to be Volvo's top-of-the-line passenger car.
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Iceberg8389
Posts: 3
Joined: Tue Sep 15, 2015 7:19 pm
Year and Model: 2005 S80
Location: United States

2005 S80 AWD weird whining noise coming from engine

Post by Iceberg8389 »

Video 1:



Video 2:



Can anyone help me with what this noise could be? Leaning towards vacuum leak. Only goes away when in gear with engine under load. It does not go away when the dipstick is pulled or oil cap is removed so I am ruling out PCV.

Iceberg8389
Posts: 3
Joined: Tue Sep 15, 2015 7:19 pm
Year and Model: 2005 S80
Location: United States

Post by Iceberg8389 »

To add, I noticed today when I turn A/C on, the noise almost goes away. Still there but much quieter and almost non existant.

Vovo_merz
Posts: 140
Joined: Mon Dec 08, 2014 10:32 am
Year and Model: 2007 s60R
Location: ohio

Post by Vovo_merz »

there is an easy way to rule out few things such as ac compressor, alternator, power steering and tensioner by removing the serpentine belt and starting the car if the noise goes away at least you know where to start, my guess would be the alternator. if the noise is still there night be your starter.
Good luck and please update once this is solved or you need more help
1995 - 850 1st
1995-97 - 850 R 3 Black, Red, Yellow
2000-04 - $40 (4)
2005-06 - $80 (8)
2001-09 - $60 (38)
2005 xc90 (2)
2001 xc70 (wifes first car)
2001-07 v70 (5)

2007 $60R (2)
2008 XC90 sport V8
1998 Merz $500 custom
2009 Merz $550
2013 chevy 2500HD

Iceberg8389
Posts: 3
Joined: Tue Sep 15, 2015 7:19 pm
Year and Model: 2005 S80
Location: United States

Post by Iceberg8389 »

Ok so I actually noticed that my serp belt needs replacing anyway, so while I have the belt removed, you are saying to start the engine and see if the noise is gone? If it does go away in that instance, then I know it's something in the accessory system.

I do not think it's the starter because it only happens when the car is warm. On cold start the noise is absent, only becomes audible when engine starts to reach temp. Also, when u turn engine off the noise will persist for 1-2 seconds after motor is off.

chrism
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Joined: Wed Jan 28, 2009 9:38 am
Year and Model: S80 / 2005
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Post by chrism »

It sure sounds like a big vacuum leak. Accelerating the car or turning on the A/C is apparently applying enough load that the vacuum drops off enough to stop, or nearly stop, the squealing.

You said you also have a CEL caused by a MAF sensor fault. Follow the vacuum line from the intake manifold to the MAF (clipped under the lip at the top of the radiator support structure) and see if the hose is cracked/loose/missing or if the MAF itself is cracked.

Vovo_merz
Posts: 140
Joined: Mon Dec 08, 2014 10:32 am
Year and Model: 2007 s60R
Location: ohio

Post by Vovo_merz »

Iceberg8389 wrote:you are saying to start the engine and see if the noise is gone? If it does go away in that instance, then I know it's something in the accessory system.
correct start it with out the serpentine belt and see what happens like I said its an easy test to rule out few things
1995 - 850 1st
1995-97 - 850 R 3 Black, Red, Yellow
2000-04 - $40 (4)
2005-06 - $80 (8)
2001-09 - $60 (38)
2005 xc90 (2)
2001 xc70 (wifes first car)
2001-07 v70 (5)

2007 $60R (2)
2008 XC90 sport V8
1998 Merz $500 custom
2009 Merz $550
2013 chevy 2500HD

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