CDTi Vibration when stationery

Pumpwater · 16th March 2011, 19:16

My CDTi vibrates annoyingly when ticking over, it seems that everything inside the car is vibrating slightly and the engine is idling at the natural vibration frequency of the car (I don't know whether that makes any sense). Perhaps some members with more experience than I have might have some ideas?
1. The engine idles at about 700rpm, is that correct
2. Can I slow it down (seems a bit fast) if so how
3. Anything else I should look for
My previous CDT saloon was very quiet on tickover, could hardly hear it
Thanks
Mike

suzublu · 16th March 2011, 19:21

Hi Mike, have you got a steering wheel damper fitted? Might reduce some of the vibration.

James.uk · 16th March 2011, 19:21

If you fit a synergy unit that will allow you to alter the tickover, it happens by chance really when you change tuner settings..

I don't know any other way to alter the tickover. Sorry.

...

wuzerk · 17th March 2011, 13:04

The diesel tickover should be at 780 + or - 50 revs. The accurate way to check it is via the onboard diagnostics. (My rev counter shows 650 revs on tickover but the OBD shows 750) My diesel drives like a dream but has always been rough on tickover despite my efforts including rebuilt and balanced injectors which made no difference. No, it is not the lower engine mount either. The last thing you want to do is slow it down!

man of kent · 17th March 2011, 18:43

I've posted recently on diesel vibration at tick over and 1800 rpm. It seems likely that each engine varies a bit. I tried a couple before buying mine. I'm not a believer in the wonderful BMW diesel syndrome. Peugeot Citroen/Ford build the best diesels now (Ford learning from Peugeot and Ricardo really). The BMW does however do big miles if you look after it - but so did diesels years ago, so whats new.

If you have a tourer without the roof vibration count yourself lucky.

I'm trying to determine whether the engine mounting rubber shore rating could have anything to do with it. i.e. the 'hardness' or shore rating must change with age, so is the vibration less with new mounting rubbers even though the ones you have look ok. Maybe the range of the shore rating specified by BMW/Rover was too wide. Maybe a mismatch between the shore rating and the vibration frequency?

COLVERT · 17th March 2011, 19:26

Could be the engine mounts ageing. The engine and mounts could now have the same resonant frequency and the two together amplify the vibration.

Colvert.

simdel1 · 17th March 2011, 19:46

I have the exact same problem, except the low idle is ok. I assume it's the engine mount. One day I'll buy a new one and see what difference it makes.

As others have said, making the low idle lower will actually make it much worse!

wuzerk · 17th March 2011, 21:29

I have fitted a brand new Rover lower mount although the original had an
extremely small split in it, and I have modified a Mondeo mount, which is much better designed. The engine pivots smoothly and easily on the top mounts when the lower mount is disconnected but nothing I have tried has made any difference to tickover vibration and I am wondering if it is due to the fact that my car is an Auto. The vibration worsens if Drive or Reverse are selected when stationary i.e. the engine is placed under load.

flyer_phil · 17th March 2011, 22:17

I have to concur with Frederick (Wuzerk). Mine has always been a noisy and I have changed the lower engine mount and it has only made a slight difference.

I think its just the overall design.

My previous Peugeot 406 HDi was very smooth and quiet, and when warm you couldn't tell it was a diesel.

However I've been very disappointed with the Rover. When I first got it I was advised that if I changed the lower engine mount and fixed the thermostat so it got properly warm, then all would be well. However this has proved not to be the case.

The engine whilst powerful and efficient is just not very smooth and refined.

man of kent · 18th March 2011, 10:50

Quote:

Originally Posted by flyer_phil

I have to concur with Frederick (Wuzerk). Mine has always been a noisy and I have changed the lower engine mount and it has only made a slight difference.

I think its just the overall design.

My previous Peugeot 406 HDi was very smooth and quiet, and when warm you couldn't tell it was a diesel.

However I've been very disappointed with the Rover. When I first got it I was advised that if I changed the lower engine mount and fixed the thermostat so it got properly warm, then all would be well. However this has proved not to be the case.

The engine whilst powerful and efficient is just not very smooth and refined.

I agree. I am disappointed with my BMW diesel. Not smooth and quite noisy - see my posts re engine clatter when warm. Has known resonance frequencies at tick over and 1800 rpm. 2 litre Peugeot is better by a long way on all counts. The Rover 75 in my opinion is a very good car let down by a rough diesel. It is however fine when driven hard and better as a manual. With an auto with automatic shifts up it does highlight the vibration as when cruising in any gear the engine is at 1800-2000 rpm just where the vibration frequency is.

16th March 2011, 19:16	#1
Pumpwater Loves to post Rover 75 CDTi Firefrost Red Join Date: Apr 2008 Location: Durham Posts: 470 Thanks: 96 Thanked 55 Times in 38 Posts	CDTi Vibration when stationery My CDTi vibrates annoyingly when ticking over, it seems that everything inside the car is vibrating slightly and the engine is idling at the natural vibration frequency of the car (I don't know whether that makes any sense). Perhaps some members with more experience than I have might have some ideas? 1. The engine idles at about 700rpm, is that correct 2. Can I slow it down (seems a bit fast) if so how 3. Anything else I should look for My previous CDT saloon was very quiet on tickover, could hardly hear it Thanks Mike __________________ Eat drink and be merry, for tomorrow they may make it illegal.

17th March 2011, 13:04	#4
wuzerk Passed Away Rover 75 CDT 03 auto Conn. SE Join Date: May 2009 Location: London Posts: 2,885 Thanks: 104 Thanked 254 Times in 204 Posts	Diesel The diesel tickover should be at 780 + or - 50 revs. The accurate way to check it is via the onboard diagnostics. (My rev counter shows 650 revs on tickover but the OBD shows 750) My diesel drives like a dream but has always been rough on tickover despite my efforts including rebuilt and balanced injectors which made no difference. No, it is not the lower engine mount either. The last thing you want to do is slow it down! Last edited by wuzerk; 17th March 2011 at 13:08..

17th March 2011, 19:46	#7
simdel1 Posted a thing or two Rover 75 Connoisseur SE CDTi, Porsche 944 Lux, MGF Join Date: Nov 2009 Location: Stamford Posts: 1,088 Thanks: 4 Thanked 6 Times in 6 Posts	I have the exact same problem, except the low idle is ok. I assume it's the engine mount. One day I'll buy a new one and see what difference it makes. As others have said, making the low idle lower will actually make it much worse! __________________ Simon The Simdel1 Fleet: http://img593.imageshack.us/img593/447/sigmgf.png

17th March 2011, 21:29	#8
wuzerk Passed Away Rover 75 CDT 03 auto Conn. SE Join Date: May 2009 Location: London Posts: 2,885 Thanks: 104 Thanked 254 Times in 204 Posts	Diesel vibration I have fitted a brand new Rover lower mount although the original had an extremely small split in it, and I have modified a Mondeo mount, which is much better designed. The engine pivots smoothly and easily on the top mounts when the lower mount is disconnected but nothing I have tried has made any difference to tickover vibration and I am wondering if it is due to the fact that my car is an Auto. The vibration worsens if Drive or Reverse are selected when stationary i.e. the engine is placed under load.

16th March 2011, 19:21	#2
suzublu This is my second home rover 75 1.8 vvc club se wedgwood blue Join Date: Aug 2009 Location: Seaton Carew Posts: 26,920 Thanks: 65 Thanked 7,142 Times in 4,642 Posts	Hi Mike, have you got a steering wheel damper fitted? Might reduce some of the vibration.

16th March 2011, 19:21	#3
James.uk Passed Away 2002 Pale Blue. Rover 75 CDTi Connoisseur auto. 170K miles Join Date: Dec 2008 Location: Near the M67. Posts: 14,509 Thanks: 199 Thanked 585 Times in 397 Posts	If you fit a synergy unit that will allow you to alter the tickover, it happens by chance really when you change tuner settings.. I don't know any other way to alter the tickover. Sorry. ...

17th March 2011, 18:43	#5
man of kent Loves to post 75 tourer auto diesel Join Date: Nov 2010 Location: Nordelph, nr Downham Market Posts: 419 Thanks: 0 Thanked 0 Times in 0 Posts	I've posted recently on diesel vibration at tick over and 1800 rpm. It seems likely that each engine varies a bit. I tried a couple before buying mine. I'm not a believer in the wonderful BMW diesel syndrome. Peugeot Citroen/Ford build the best diesels now (Ford learning from Peugeot and Ricardo really). The BMW does however do big miles if you look after it - but so did diesels years ago, so whats new. If you have a tourer without the roof vibration count yourself lucky. I'm trying to determine whether the engine mounting rubber shore rating could have anything to do with it. i.e. the 'hardness' or shore rating must change with age, so is the vibration less with new mounting rubbers even though the ones you have look ok. Maybe the range of the shore rating specified by BMW/Rover was too wide. Maybe a mismatch between the shore rating and the vibration frequency?

17th March 2011, 19:26	#6
COLVERT This is my second home R75 Saloon. Join Date: Feb 2009 Location: France/or Devon. Posts: 14,003 Thanks: 3,851 Thanked 2,167 Times in 1,816 Posts	Could be the engine mounts ageing. The engine and mounts could now have the same resonant frequency and the two together amplify the vibration. Colvert.

17th March 2011, 22:17	#9
flyer_phil Loves to post Rover 75 CDT Classic, 2003, Moonstone Join Date: Mar 2008 Location: Chesterfield at the moment Posts: 411 Thanks: 0 Thanked 1 Time in 1 Post	I have to concur with Frederick (Wuzerk). Mine has always been a noisy and I have changed the lower engine mount and it has only made a slight difference. I think its just the overall design. My previous Peugeot 406 HDi was very smooth and quiet, and when warm you couldn't tell it was a diesel. However I've been very disappointed with the Rover. When I first got it I was advised that if I changed the lower engine mount and fixed the thermostat so it got properly warm, then all would be well. However this has proved not to be the case. The engine whilst powerful and efficient is just not very smooth and refined.