Noise at 2k revs

mantianak · 26th March 2008, 20:39

I've had a slight noise for a long time now, but it's getting a little worse. A kind of constant whirring noise when sat at 2k revs and also briefly when passing through over the 2k mark. Can be heard when idling cold at about 1 1/3, no sound at other revs. Difficult to pin point where from under the bonnet. Any ideas?

David3807 · 26th March 2008, 21:10

KV6 ?? Auto ?? by any chance ??

mantianak · 26th March 2008, 21:11

Sorry, forgot to mention. 2000 KV6 2.0 manual

David3807 · 26th March 2008, 21:16

Does it happen with the A/c on and off.

My previous 2.00 Auto (also a 2000 car) had a sort of whirring noise which didnt change much with revs nor could I hear it over 2k revs but did vanish with the A/c off , ie off or on econ.

Conclusion. Air con Compressor.

Car was sold before noise got bad enough to fix or investigate further.

Phil · 26th March 2008, 21:18

Does it sound any different with a/c on/off? It could be the aux belts. You can buy belt dressing that you spray on the belts that can queten noises down if from that area. Worse when warm or cold? When turning steering?

mantianak · 26th March 2008, 21:22

I don't think I've had the air con on for a long time. I will check tomorrow though.

Now you've said that, I'm now guessing if it's something to do with the drive belt or anything run from it, then turning the AC on/off will change the load put on the belt and perhaps change the noise. That could give me an clue anyway.

mantianak · 26th March 2008, 21:27

Quote:

Originally Posted by Phil

Does it sound any different with a/c on/off? It could be the aux belts. You can buy belt dressing that you spray on the belts that can queten noises down if from that area. Worse when warm or cold? When turning steering?

Dressings you say. I've not seen these sprays before, could be worth having even if it's not the cause.

No change in cold/warm, not noticed if on corners. The only reason it does it when idle is beacuse it hangs the revs at the 'sweet spot'. Same again if I hold the revs at 2k (or just under) with the pedal.

stocktake · 26th March 2008, 21:31

The Cats are known to rattle on the KV6, noticable on cold startup, mine does it when its cold.

Just a thought

mantianak · 27th March 2008, 17:02

Having air con on or off didn't seem to make a difference. I may try some of that spray stuff, couldn't hurt.

webteb · 28th March 2008, 08:09

If the noise is "metallicy" and is isolated to a limited rev range then I agree it could the exhaust/ cat. There is a repair available which basically employs a simple rewelding of the inner and outer pipes just before they enter the cat. Worked a treat on mine.

26th March 2008, 20:39	#1
mantianak I really should get out more....... ZT 190+ Saloon Join Date: Nov 2006 Location: Poole Posts: 2,413 Thanks: 6 Thanked 22 Times in 21 Posts	Noise at 2k revs I've had a slight noise for a long time now, but it's getting a little worse. A kind of constant whirring noise when sat at 2k revs and also briefly when passing through over the 2k mark. Can be heard when idling cold at about 1 1/3, no sound at other revs. Difficult to pin point where from under the bonnet. Any ideas? __________________ http://i35.photobucket.com/albums/d1..._signature.png

26th March 2008, 21:11	#3
mantianak I really should get out more....... ZT 190+ Saloon Join Date: Nov 2006 Location: Poole Posts: 2,413 Thanks: 6 Thanked 22 Times in 21 Posts	Sorry, forgot to mention. 2000 KV6 2.0 manual __________________ http://i35.photobucket.com/albums/d1..._signature.png

26th March 2008, 21:18	#5
Phil This is my second home Rover 75 CDT Connoisseur SE Join Date: Nov 2006 Location: Wales Posts: 12,227 Thanks: 469 Thanked 523 Times in 241 Posts	Does it sound any different with a/c on/off? It could be the aux belts. You can buy belt dressing that you spray on the belts that can queten noises down if from that area. Worse when warm or cold? When turning steering? __________________

26th March 2008, 21:22	#6
mantianak I really should get out more....... ZT 190+ Saloon Join Date: Nov 2006 Location: Poole Posts: 2,413 Thanks: 6 Thanked 22 Times in 21 Posts	I don't think I've had the air con on for a long time. I will check tomorrow though. Now you've said that, I'm now guessing if it's something to do with the drive belt or anything run from it, then turning the AC on/off will change the load put on the belt and perhaps change the noise. That could give me an clue anyway. __________________ http://i35.photobucket.com/albums/d1..._signature.png

26th March 2008, 21:31	#8
stocktake Vis Whiz Rover 75 2.5 auto Saloon Join Date: Jun 2007 Location: LEEDS Posts: 20,591 Thanks: 2,057 Thanked 3,056 Times in 1,621 Posts	The Cats are known to rattle on the KV6, noticable on cold startup, mine does it when its cold. Just a thought __________________ Dave... Lost a few stones and a Gall Bladder and part of a bile duct and all of my dignity in the suppository incident

26th March 2008, 21:10	#2
David3807 Posted a thing or two 2002 R75 Conn SE 2.5l Auto Tourer, 2001 R75 Conn SE 2.5 Auto Saloon Join Date: Nov 2006 Location: Gravesend Posts: 1,897 Thanks: 0 Thanked 2 Times in 2 Posts	KV6 ?? Auto ?? by any chance ??

26th March 2008, 21:16	#4
David3807 Posted a thing or two 2002 R75 Conn SE 2.5l Auto Tourer, 2001 R75 Conn SE 2.5 Auto Saloon Join Date: Nov 2006 Location: Gravesend Posts: 1,897 Thanks: 0 Thanked 2 Times in 2 Posts	Does it happen with the A/c on and off. My previous 2.00 Auto (also a 2000 car) had a sort of whirring noise which didnt change much with revs nor could I hear it over 2k revs but did vanish with the A/c off , ie off or on econ. Conclusion. Air con Compressor. Car was sold before noise got bad enough to fix or investigate further.

27th March 2008, 17:02	#9
mantianak I really should get out more....... ZT 190+ Saloon Join Date: Nov 2006 Location: Poole Posts: 2,413 Thanks: 6 Thanked 22 Times in 21 Posts	Having air con on or off didn't seem to make a difference. I may try some of that spray stuff, couldn't hurt. __________________ http://i35.photobucket.com/albums/d1..._signature.png

28th March 2008, 08:09	#10
webteb Newbie Rover 75 saloon Join Date: Nov 2006 Location: New Zealand Posts: 18 Thanks: 0 Thanked 0 Times in 0 Posts	If the noise is "metallicy" and is isolated to a limited rev range then I agree it could the exhaust/ cat. There is a repair available which basically employs a simple rewelding of the inner and outer pipes just before they enter the cat. Worked a treat on mine.