What is that "whirring" sound??? - Jaguar F-Type Forum
 
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post #1 of 6 (permalink) Old 04-08-2014, 07:45 PM Thread Starter
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What is that "whirring" sound???

Hi all,

I've had a '14 6-cylinder convertible (not S) for about 3 months now and I do love the car. However, there is one thing that is DRIVING ME CRAZY...

Does anyone else hear this low "whirring" sound coming from the back left? Only 1-2 seconds long, it sounds like a small motor. Similar to the sound of the motors that move the side view mirrors. It's pretty quiet but just loud enough so that when I am driving at low speeds i hear it. I can't tell what/where/why it's there but it's annoying as ****.

Not sure if anyone has noticed this or not. The best way to listen for it is when your at a full stop, audio turned off, and you press the park button (both into, and out of park). I thought it was maybe something with the brakes but the sound happens while driving too.

Any help/info would be much appreciated!
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post #2 of 6 (permalink) Old 04-09-2014, 06:35 AM
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Hi ,
I hear the same sound on my V8 . Due to my investigation
the vacuum pump necessary for operating the active exhaust
system which is located under the left rear fender is responsible
for this "noise".
Every time the active exhaust opens a certain amount of
fresh air gets into the system which has to be evacuated
by the pump afterwards. That's why you hear the pump only
in nonuniform time periods depending on the activity of the
exhaust valves.

Regards
Ulrich
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post #3 of 6 (permalink) Old 04-09-2014, 08:23 AM
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Wow, f-driver! Great response. My V8 also has this feature. I mentioned it during my last service visit and the tech just wrote that the system was operating as designed which is fine but told me nothing about the source of the sound as you did. It doesn't really bother me, just thought it might be something was going awry.
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post #4 of 6 (permalink) Old 04-09-2014, 09:54 AM
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Because I only hear it with the top closed it doesn't bother me too.
Up to now I didn't heared / read about complaints concerning this issue,
so it would be interesting whether this "noise" is common to all cars
with active exhaust system or specific to a limited number of cars
having "louder" pumps.
My one was built 07/2013
Regards
Ulrich
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post #5 of 6 (permalink) Old 04-09-2014, 12:52 PM
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I don't think there's enough critical mass on this board for us to answer your question with confidence, but if it means anything, my car was built 7/13 also.
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post #6 of 6 (permalink) Old 06-21-2014, 03:55 AM
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I got some additional information on this issue . The "whirring sound" is caused
by a hose connector between the vacuum pump and the vacuum tank .
A missing bracket on the vaccum pump assembly allows the tube to contact the
car body and by this transferring the sound of the pump to it.
Will let it check during my first service coming soon . Shouldn't be a problem to
get it fixed .

Regards
Ulrich
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