1998 Volvo S70 GLT has weird humming/buzzing noise when idling ****Videos of problem noise****

Tiny
MIKEY4040
  • MEMBER
  • 1998 VOLVO S70
  • 135,000 MILES
I have some weird humming/buzzing noise coming from the engine of my 1998 Volvo S70 GLT. I created a thread with my problem on a Volvo forum. I will include the link to the thread so anyone that can help me and follow the thread.


Link to thread-

http://www.matthewsvolvosite.com/forums/viewtopic.php?f=1&t=43865



Links to videos-

http://www.youtube.com/watch?v=7yGaZdGe1ss


http://www.youtube.com/watch?v=Z5Jt9ERwiVI


Saturday, November 5th, 2011 AT 1:49 AM

9 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,119 POSTS
It sounds like a vacuum leak. Have you checked for that
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Saturday, November 5th, 2011 AT 2:04 AM
Tiny
MIKEY4040
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No I have not checked for a vacuum leak. I could check that out tomorrow and see if I see any vacuum hoses around that area.
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Saturday, November 5th, 2011 AT 2:17 AM
Tiny
JACOBANDNICKOLAS
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Check hoses, intake, throttle body plate. It sounds like a rubber hose to me, however. If you know how, use carb cleaner to check for the leaks.
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Saturday, November 5th, 2011 AT 2:33 AM
Tiny
JIS001
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If you do have a vacuum leak it could be an internal vacuum leak. Remove the oil dipstick and see if the noise goes away. If it does then you need to replace the oil trap box. Keep us posted please.
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Saturday, November 5th, 2011 AT 4:21 AM
Tiny
MIKEY4040
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I tried to pull the dipstick out already as well as removing the oil cap. If you click on the forum link you can see the other advice forum posted and the things I already did and tried. Thanks for replies.
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Saturday, November 5th, 2011 AT 4:38 AM
Tiny
JIS001
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Ok then I believe your noise is coming from the piston cooling valve. Remove the serpentine belt and timing belt cover and run engine with timing belt cover off. The piston cooling valve is under the water pump area. It is a 17mm bolt I believe. If you do here the buzzing the noise from that area then replace the valve. Good luck to you and let us know what happens. To replace it you will need to remove the timing belt and water pump so see if you can get just the water pump gasket or if you need to do the whole water pump as well?
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Saturday, November 5th, 2011 AT 7:21 PM
Tiny
MIKEY4040
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  • 4 POSTS
Found problem it is a vacuum leak like Jacobandnickolas mentioned. Right under the thermostat housing there a black hose it runs behind the manifold it split a little causing the noise. I was fishing around with a screwdriver moving all hoses around the engine and when I moved that the noise stop. Problem is the hose is very hard to get to without removing the power steering pump and thermostat housing. I noticed if I push on the hose slightly the noise stops so I'm going to use a tie wrap a long one so I can maneuver it in there and around the hose and this will shut up the noise. It did not cause the check engine light to illuminate and no performance lost so this should do the trick. To replace the hose with a new one will be a PITA to get in there without removing things. Thanks for all the advice I appreciate it.
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Saturday, November 5th, 2011 AT 10:20 PM
Tiny
JIS001
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Good job and thanks for keeping us posted to the fix.
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Saturday, November 5th, 2011 AT 11:17 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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I thought that is what it sounded like. Glad it's fixed. Let us know if you have questions in the future.
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Sunday, November 6th, 2011 AT 5:32 AM

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