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98 S70 Engine ‘singing’ noise

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

Stu70
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Year and Model: 1998 S70 10v
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Stu70

98 S70 Engine ‘singing’ noise

Post by Stu70 » Fri Jul 05, 2019 6:22 pm

Hello, I’m hoping someone can shed some light on my troubles...
B5252 10v , once car gets to operating temp to begins to “sing” I’m devaluing Volvo’s when I pull up to lights- it’s a ‘oh he should get that noise fixed’ sort of noise - see video
PCV done 35k miles ago. Noise started before I did timing belt, pump and tensioners, and keeps going when serp belt off , but stops when engine revved -see video.
Using an electronic stethoscope, it seems to be coming from block or PCV tank. Louder down the gap between 2-3 intakes on the manifold.
Any thoughts ? getting parts from across the world does make it expensive to ‘shotgun service’- just replace everything it might be and never knowing what it was that cured it.
I’m wondering if a partially blocked hose might set up a resonance? Or a hole in the intake gasket/ manifold might whistle?

Video here...
https://youtu.be/ciToRNITjTk

Many thanks


1998 S70 10v BiFuel “it’s a what??”

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abscate
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Year and Model: 99T5 ,99S70,2005V70
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Re: 98 S70 Engine ‘singing’ noise

Post by abscate » Sat Jul 06, 2019 4:01 am

That sounds like a vacuum leak, I would pull the intake and check the Pcv system for a loose or holed hose
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