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Volvo V70 strange noise

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Old Jan 14th, 2019, 13:19   #1
BlueRubber
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Default Volvo V70 strange noise

Got a strange noise coming from my V70 2002 2.4 n/a - 133,000 miles

I made a video of it:
https://youtu.be/q3W8V4-oP2o

It seems to be coming from the under the drivers side of the car.
It is also intermittent, usually starts a few mins after I drive away with a cold engine. But is sometimes there after a 30min drive.

Also when I rev the car the noise doesn't seem to change, except when I let off the throttle it goes away for a few seconds and then comes back.

Any ideas?
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Old Jan 14th, 2019, 13:59   #2
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...do hate guessing wrong.

I've always heard there's a brake booster pump. It maintains pressure when the ABS system is active. Might that be it?

Pull its fuse and see if the noise goes away.
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Old Jan 14th, 2019, 17:01   #3
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Quote:
Originally Posted by Georgeandkira View Post
I've always heard there's a brake booster pump. It maintains pressure when the ABS system is active. Might that be it?

Pull its fuse and see if the noise goes away.
I have tested the brake booster as per this video:
https://www.youtube.com/watch?v=2xzahn6Dh-o
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Old Jan 14th, 2019, 19:18   #4
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It is a strange sound.. if you undo the oil cap on the engine does it go away ?

Might have to do with the exhaust..

Have you inspected the timing belt ? https://www.youtube.com/watch?v=4zbkJYkLxCA
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Old Jan 14th, 2019, 20:25   #5
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Quote:
Originally Posted by oragex View Post
if you undo the oil cap on the engine does it go away ?
I just tried this and no it doesn't.
But the noise definitely does go away when you let off the throttle when in neutral. Then usually comes back shortly afterwards.

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Originally Posted by oragex View Post
Have you inspected the timing belt ? https://www.youtube.com/watch?v=4zbkJYkLxCA
Have not had a chance to try this yet, but will give it a go.
The car had a new belt + tensioner fitted 15,000 miles ago.
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Old Jan 15th, 2019, 02:30   #6
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The test you performed is for the integrity of the diaphragm inside the power brake unit. I was referring to the pump which makes up the difference when brake fluid pressure is relieved by the ABS system opening the valve (so the wheel resumes spinning).
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Old Jan 15th, 2019, 10:31   #7
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Quote:
Originally Posted by Georgeandkira View Post
The test you performed is for the integrity of the diaphragm inside the power brake unit. I was referring to the pump which makes up the difference when brake fluid pressure is relieved by the ABS system opening the valve (so the wheel resumes spinning).
Sorry I misunderstood, thanks for explaining

So do I just pull the ABS fuse to test this?
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Old Jan 16th, 2019, 14:18   #8
Georgeandkira
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I assume so. It has a motor in it so it "has" to be fused.
Remember, this is an educated (ah-hem) guess on my part.
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Old Yesterday, 20:16   #9
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Quote:
Originally Posted by Georgeandkira View Post
I assume so. It has a motor in it so it "has" to be fused.
Remember, this is an educated (ah-hem) guess on my part.
Thanks for the honesty

I assume if this was to cause some ABS warning light I could reset it with my copy of VIDA?
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