KV6 RPM-related high-pitched whistle/whine

Bolin · 13th September 2015, 23:06

Today I had a high-pitched whistle/whine as soon as I drove off, which varied with engine RPM.

It seems louder under load, and almost silent when cruising.

Almost sounds like it's related to the air intake??

Had a quick look under the bonnet but couldn't see anything obvious. PAS reservoir hasn't lost fluid, but I have had a tiny tiny weep for from the pump for ages.

Any ideas before I investigate further?

Ta

t5tart · 14th September 2015, 00:06

Quote:

Originally Posted by Bolin

Today I had a high-pitched whistle/whine as soon as I drove off, which varied with engine RPM.

It seems louder under load, and almost silent when cruising.

Almost sounds like it's related to the air intake??

Had a quick look under the bonnet but couldn't see anything obvious. PAS reservoir hasn't lost fluid, but I have had a tiny tiny weep for from the pump for ages.

Any ideas before I investigate further?

Ta

you sure its not coming from your speakers ?

Avora · 14th September 2015, 07:04

My aircon pump sounds like a supercharger whining away. Try turning that off.

Ps3000 · 14th September 2015, 07:46

Quote:

Originally Posted by Avora

My aircon pump sounds like a supercharger whining away. Try turning that off.

Mine too, always has, pressing "econ" on the climate panel results in silence (but steamy windows in this weather).

Bolin · 21st September 2015, 21:53

Not the aircon, as that was off.

Quote:

Originally Posted by t5tart

you sure its not coming from your speakers ?

I think you might be on to something.

This noise stopped after a very short time - and it quite probably coincided with there being water in the boot, which made the Highline radio connector wet.

So, is it possible that a wet connector made the radio broadcast the noise of the car's electrical system?

Or more likely that it was a self-healing air-intake fault?

I have been told that it possible that the alternator's whine could have been broadcasting itself, and I think that is probably what happened.

t5tart · 21st September 2015, 21:55

Quote:

Originally Posted by Bolin

Not the aircon, as that was off.

I think you might be on to something.

This noise stopped after a very short time - and it quite probably coincided with there being water in the boot, which made the Highline radio connector wet.

So, is it possible that a wet connector made the radio broadcast the noise of the car's electrical system?

Or more likely that it was a self-healing air-intake fault?

I have been told that it possible that the alternator's whine could have been broadcasting itself, and I think that is probably what happened.

alternator whine can be common with stereo systems esp with a bad earth

milosnikolic · 22nd September 2015, 06:51

it can also be gearbox whine...

Bolin · 2nd October 2015, 21:27

Not occurred since, have got the radio in the main boot at the moment, I am sure this problem was caused by the radio connector getting wet.

13th September 2015, 23:06	#1
Bolin This is my second home Rover 75 2.5 V6 Connoisseur SE 4dr manual Wedgewood Blue 2 04-05/06/2001 Join Date: Nov 2006 Location: N.E. Hampshire Posts: 4,622 Thanks: 289 Thanked 308 Times in 243 Posts	KV6 RPM-related high-pitched whistle/whine Today I had a high-pitched whistle/whine as soon as I drove off, which varied with engine RPM. It seems louder under load, and almost silent when cruising. Almost sounds like it's related to the air intake?? Had a quick look under the bonnet but couldn't see anything obvious. PAS reservoir hasn't lost fluid, but I have had a tiny tiny weep for from the pump for ages. Any ideas before I investigate further? Ta __________________ "...the new Rover 75, which is a fabulous car......I think it looks fabulous....It's like sitting in a Rolls Royce......For me, this is the star of the show.....it looks so good" - J. Clarkson, motoring journalist on the launch of the Rover 75 in 1998.

14th September 2015, 07:04	#3
Avora Loves to post MG ZT-T 190 Join Date: Jul 2014 Location: Penrith Posts: 441 Thanks: 89 Thanked 69 Times in 56 Posts	My aircon pump sounds like a supercharger whining away. Try turning that off. __________________ ZT-T 190

22nd September 2015, 06:51	#7
milosnikolic Loves to post Rover 75 Join Date: Apr 2010 Location: Belgrade Posts: 395 Thanks: 32 Thanked 26 Times in 16 Posts	it can also be gearbox whine... __________________ Add SPEED READOUT on your IPK LCD Proud owner of the best Rover 75 in Serbia

2nd October 2015, 21:27	#8
Bolin This is my second home Rover 75 2.5 V6 Connoisseur SE 4dr manual Wedgewood Blue 2 04-05/06/2001 Join Date: Nov 2006 Location: N.E. Hampshire Posts: 4,622 Thanks: 289 Thanked 308 Times in 243 Posts	Not occurred since, have got the radio in the main boot at the moment, I am sure this problem was caused by the radio connector getting wet. __________________ "...the new Rover 75, which is a fabulous car......I think it looks fabulous....It's like sitting in a Rolls Royce......For me, this is the star of the show.....it looks so good" - J. Clarkson, motoring journalist on the launch of the Rover 75 in 1998.