M47 Diesel Engine Whine / Whistle On The Overun - Page 3

apxc15 · 4th October 2007, 16:27

Chopped my 01 CDT saloon in for a 04 facelift CDTI Tourer a couple of weeks ago and now I have this same noise. Tried my friendly BMW expert and he doesn't have a clue as to what it could be. He says he doesn't know of any Beamers with this engine having this problem. I would love to know if it's curable as it gets on my nerves driving around town.

Roverron · 4th October 2007, 16:52

Quote:

Originally Posted by apxc15

Chopped my 01 CDT saloon in for a 04 facelift CDTI Tourer a couple of weeks ago and now I have this same noise. Tried my friendly BMW expert and he doesn't have a clue as to what it could be. He says he doesn't know of any Beamers with this engine having this problem. I would love to know if it's curable as it gets on my nerves driving around town.

I think we concluded its a resonance in the fuel lines around the high pressure pump.
Julesbass was doing some investigation but I'm not sure what the outcome was.

Ron

Jules · 4th October 2007, 23:39

Still no solution to this yet I'm afraid

grossebaby · 5th October 2007, 11:23

Mine does the whine, sigh, groan too. 04 zt CDTi.

Has done it all the time I've had it but I do find it goes away almost sometimes, but then returns with a vengeance usually after a long FAST run.

Have learnt to ignore it but would love to cure.

75tour · 24th January 2008, 18:43

Hi,

and BUMP!!!

Well I am new to the 75 club - got my 2005 75 tourer a couple of weeks ago. The first problem I had was cruise control not working - a quick visit
to this site fixed that

Last week I noticed a whine which today I finally had enough of so thought I'd do a search and see if anyone else had had this issue and BINGO! a perfect description - 1Khz on overrun yes me too!!!!

I am feeling better now that I know my turbo isn't about to go pop.

One thought I have had since reading this thread is that it could simply be a resonant frequency in the fuel line that occurs when fuel flow is at a specific rate - like a flute, hence the constant 1Khz - this would be the systems resonant freq - just a thought and if true no need worry but not much you could do about it either.

fab site which for me gets better by the day thanks to all who provide such great input

cheers

podge · 24th January 2008, 18:50

Could somebody swop me their whine for my mysterious knock/rattle! I think I will have to start a new dedicated thread to this , seen two more guys to-day about this.

JohnDotCom · 24th January 2008, 21:53

Quote:

Originally Posted by podge

Could somebody swop me their whine for my mysterious knock/rattle! I think I will have to start a new dedicated thread to this , seen two more guys to-day about this.

What the Knock the rattle or the Wine?

johnbillard · 24th January 2008, 22:10

This sounds familiar - I have an engine buzz at about 1800 rpm that occurs only when car has warmed up (2006 registered CDTi Tourer, 29k miles). It is also intermittent and varies in intensity. While I'd love to fix it I'd really like to be assured that it is not a serious problem that might be ignored, at least for now?

Kind regards to all

razorriggott · 24th June 2008, 21:06

I have an 2004 CDTi with 39k that displays this noise. My previous 1999 CDT with 90k was fine. It is really annoying, someone please help!

Austingarages · 24th June 2008, 21:56

This is a very interesting thread!

Working on these cars day in day out, as far as I'm concerned, all late model diesels have this noise - but some are quieter than others. In fact a friend of mine has just bought a Rover 75 Contempory SE CDTi Manual which has the noise, he was not aware of it until I pointed it out to him!

The problem lies with our old friend Project Drive, they did some plumbing to remove the secondary low presure fuel pump next to the battery, revised fuel pipes, revised conections to fuel cooler, etc. Ever since they did that, this noise is present. As far as I can detect where its coming from, it is caused by the PWM signal to the high pressure fuel regulator in the high pressure pump - this sets up a vibration down the fuel lines (you can best hear it with a stethoscope on the return pipe from the regulator. The alterations they made to the plumbing must have somehow taken out the damping effect within the fuel lines to set up this noise. I have swapped the Regulator from a good known early car and it does reduce the noise for a short period of time and then its back again....

So the 2004 facelift of Rover 75 / MG ZT started from VIN 321638, however, the fuel pump delete was from VIN 5D332301, so there are a few lucky facelift owners out there that "should" not have this problem!

The only solution I can think of (unless someone comes up with a fuel pipe damper - rather like the 75 diesel clutch pipe damper maybe!) is to fit the older type fuel system!

One thing I have learned from here reading all of this, is that MGR were aware of the problem and were in the course of dealing with it...

As for BMWs not have this problem, I wonder if thier engineers have a Project "FAHRT"!

4th October 2007, 23:39	#23
Jules This is my second home ZT 260 SE Twilight and 10 other 75 ZT's :O Join Date: Jan 2007 Location: Conwy NORTH WALES Posts: 11,094 Thanks: 512 Thanked 1,116 Times in 763 Posts	Still no solution to this yet I'm afraid __________________ [SIGPIC][/SIGPIC] Newbies do now!! 1. Plenum drains..all 3 or 4 year dependent 2. Cooling fan..All speeds functioning 3. Bonnet cable divider block

5th October 2007, 11:23	#24
grossebaby Gets stuck in SUBARU LEGACY DIESEL Join Date: Sep 2007 Location: Halifax Posts: 508 Thanks: 0 Thanked 0 Times in 0 Posts	Me too Mine does the whine, sigh, groan too. 04 zt CDTi. Has done it all the time I've had it but I do find it goes away almost sometimes, but then returns with a vengeance usually after a long FAST run. Have learnt to ignore it but would love to cure.

24th January 2008, 22:10	#28
johnbillard Regular poster Rover 75 CDTi Tourer Join Date: Jan 2008 Location: Twyford, Berks Posts: 62 Thanks: 2 Thanked 0 Times in 0 Posts	Buzz at about 1800 rpm This sounds familiar - I have an engine buzz at about 1800 rpm that occurs only when car has warmed up (2006 registered CDTi Tourer, 29k miles). It is also intermittent and varies in intensity. While I'd love to fix it I'd really like to be assured that it is not a serious problem that might be ignored, at least for now? Kind regards to all

4th October 2007, 16:27	#21
apxc15 Newbie Rover 75 Tourer CDTi Connoisseur SE. Join Date: Oct 2007 Location: Marbella Posts: 23 Thanks: 0 Thanked 0 Times in 0 Posts	Chopped my 01 CDT saloon in for a 04 facelift CDTI Tourer a couple of weeks ago and now I have this same noise. Tried my friendly BMW expert and he doesn't have a clue as to what it could be. He says he doesn't know of any Beamers with this engine having this problem. I would love to know if it's curable as it gets on my nerves driving around town.

24th January 2008, 18:43	#25
75tour Newbie 75 Tourer 2.0 CDTi Contemporary Join Date: Jan 2008 Location: Wilts Posts: 7 Thanks: 0 Thanked 0 Times in 0 Posts	Hi, and BUMP!!! Well I am new to the 75 club - got my 2005 75 tourer a couple of weeks ago. The first problem I had was cruise control not working - a quick visit to this site fixed that Last week I noticed a whine which today I finally had enough of so thought I'd do a search and see if anyone else had had this issue and BINGO! a perfect description - 1Khz on overrun yes me too!!!! I am feeling better now that I know my turbo isn't about to go pop. One thought I have had since reading this thread is that it could simply be a resonant frequency in the fuel line that occurs when fuel flow is at a specific rate - like a flute, hence the constant 1Khz - this would be the systems resonant freq - just a thought and if true no need worry but not much you could do about it either. fab site which for me gets better by the day thanks to all who provide such great input cheers

24th January 2008, 18:50	#26
podge I really should get out more....... Rover 75 Tourer CDT CLUB SE Copper Red Mica Dec 01 ....now deceased....replaced by2003 Royal Blue T Join Date: Nov 2007 Location: North Warnborough, Hampshire Posts: 2,398 Thanks: 9 Thanked 69 Times in 20 Posts	Could somebody swop me their whine for my mysterious knock/rattle! I think I will have to start a new dedicated thread to this , seen two more guys to-day about this.

24th June 2008, 21:06	#29
razorriggott Newbie rover 75 connoisseur se cdti saloon Join Date: Feb 2008 Location: Sheffield Posts: 21 Thanks: 0 Thanked 0 Times in 0 Posts	I have an 2004 CDTi with 39k that displays this noise. My previous 1999 CDT with 90k was fine. It is really annoying, someone please help!

24th June 2008, 21:56	#30
Austingarages Regular poster X13 #18 Join Date: Dec 2007 Location: Needwood, Burton-on-Trent Posts: 57 Thanks: 0 Thanked 1 Time in 1 Post	This is a very interesting thread! Working on these cars day in day out, as far as I'm concerned, all late model diesels have this noise - but some are quieter than others. In fact a friend of mine has just bought a Rover 75 Contempory SE CDTi Manual which has the noise, he was not aware of it until I pointed it out to him! The problem lies with our old friend Project Drive, they did some plumbing to remove the secondary low presure fuel pump next to the battery, revised fuel pipes, revised conections to fuel cooler, etc. Ever since they did that, this noise is present. As far as I can detect where its coming from, it is caused by the PWM signal to the high pressure fuel regulator in the high pressure pump - this sets up a vibration down the fuel lines (you can best hear it with a stethoscope on the return pipe from the regulator. The alterations they made to the plumbing must have somehow taken out the damping effect within the fuel lines to set up this noise. I have swapped the Regulator from a good known early car and it does reduce the noise for a short period of time and then its back again.... So the 2004 facelift of Rover 75 / MG ZT started from VIN 321638, however, the fuel pump delete was from VIN 5D332301, so there are a few lucky facelift owners out there that "should" not have this problem! The only solution I can think of (unless someone comes up with a fuel pipe damper - rather like the 75 diesel clutch pipe damper maybe!) is to fit the older type fuel system! One thing I have learned from here reading all of this, is that MGR were aware of the problem and were in the course of dealing with it... As for BMWs not have this problem, I wonder if thier engineers have a Project "FAHRT"!