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Loud hum

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Old 11-04-2018, 04:37 PM
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Loud hum

I have had a lot of help on this site, so here I go again! Haven't driven my car in a few weeks - rainy weather. Today is sunny so I took the car out. After a few miles, I started to hear a hum which kept getting louder. By the time I got home, it was pretty loud. I have felt like the clutch was starting to slip. Can the two be related? Thanks. BTW, my car is an '11
V8V S with the ss2
 

Last edited by Denny 6.53; 11-04-2018 at 04:46 PM.
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Old 11-05-2018, 06:29 AM
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Originally Posted by Denny 6.53 View Post
I have had a lot of help on this site, so here I go again! Haven't driven my car in a few weeks - rainy weather. Today is sunny so I took the car out. After a few miles, I started to hear a hum which kept getting louder. By the time I got home, it was pretty loud. I have felt like the clutch was starting to slip. Can the two be related? Thanks. BTW, my car is an '11
V8V S with the ss2
Need more info. Where is it coming from, does it vary with speed or braking. BTW unlikely itís the clutch.
 
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Old 11-05-2018, 08:39 AM
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The noise is outside of the car and sounds like it's on the right side. Almost like a pump, but not a squeal like a bearing. Water pump? The direction of
the sound can be deceiving, but I left the car running when I got home, and it sounded like the right side.
 
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Old 11-05-2018, 09:18 AM
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Originally Posted by Denny 6.53 View Post
The noise is outside of the car and sounds like it's on the right side. Almost like a pump, but not a squeal like a bearing. Water pump? The direction of
the sound can be deceiving, but I left the car running when I got home, and it sounded like the right side.
A pump in the engine compartment? Or towards the rear of the car? A mechanics stethoscope can be helpful.

 
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Old 11-05-2018, 09:29 AM
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You have a Vacuum leak for the exhaust bypass, simple to check, remove fuse #22 in the left rear fuse box. (under the carpet in the trunk) yellow 20amp fuse.
 
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Old 11-05-2018, 05:51 PM
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Originally Posted by J doubleU View Post
You have a Vacuum leak for the exhaust bypass, simple to check, remove fuse #22 in the left rear fuse box. (under the carpet in the trunk) yellow 20amp fuse.
After removing fuse #22, how to test?
I recently removed it and got emission service required message. I cleared the fault code and it came back after a week. I put the fuse back, cleared the fault codes and waiting to see if it comes again.
 
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Old 11-05-2018, 06:40 PM
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Fuse is for the vacuum pump in the right rear of the car. Removes the power to the pump to keep it from running. Later models the fuse is a 5amp in #15 slot. you may want to check that.
 
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Old 11-05-2018, 07:59 PM
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OK ! I pulled fuse 22 and started the car. Definitely louder at idle. I am going to drive it tomorrow or Wednesday,
when the shop is closed. No hum at the moment.

Thank you, everyone !
 
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