Vibration at idle

Alan_M · 21st June 2019, 12:21

Hello, this is my first post as I have just bought a 2001 Connoisseur manual CDT tourer. I have been slowly reading through the forum to get a good idea about these cars.

Now the one I’ve bought does have a few issues that need to be sorted and some areas I would like to improve.

The first is engine vibration at idle. The temp gauge only goes to about half way between 7 and 8 o’clock. So I will be adding an in line thermostat and also looking to fix the fuel burning heater.

My question is will the engine running cool effect idle as idle is about 600 rpm, or having looked through the forum is this more likely to be just the hydramount?

I tend to do all my own spannering, so have no problems delving into sorting this car - just don’t know Rovers yet, so some learning required.

markypicks · 21st June 2019, 18:02

could be hydromount or bottom engine/gearbox mount i replaced my lower engine mount last year as the rubbers were all shot easy enough job my bottom mount cost me 40 quid original as well as for the in line stat i fitted one last year got it from dmgrs for 15 quid inc postage and works very well as same easy enough job the hardest part is cutting off the metal clip. as you go down hill the temp gauge drops to zero its a fault on the deisel cars it opens too early. or you could go expensive and fit a original but is awkward as its at the back of the engine and you will have to remove the water pump rgds mark

COLVERT · 21st June 2019, 18:21

The slow tick over and vibration at idle could easily be an injector not quite right.---

Alan_M · 22nd June 2019, 10:56

Thanks for replies.

What should the idle speed be?

Hopefully not an injector as I guess that’s the most expensive to fix.
What is the best way to go about testing the injectors? Can you read injector values with something like TOAF, and would that show if there is an issue? Would a leak down test help?

I’ve ordered a copy of RAVE which I should get soon, so I will have a look through that when it arrives.

KeithA · 22nd June 2019, 11:18

I believe the idle speed is about 780 rpm on diesels

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genpk · 22nd June 2019, 12:05

i have diesel 75 and have always had the vibration at idle.
changed hydro mount and lower engine mount which improved the vibration a bit but still there.
I then changed the thermostat and water pump so engine runs at right temp but
still the vibration at idle.
Apart from that the engine runs well.
Also another thing, occasionally when steering is on full lock at idle, the idle drops so low the engine cuts out.

COLVERT · 23rd June 2019, 20:18

Quote:

Originally Posted by genpk

i have diesel 75 and have always had the vibration at idle.
changed hydro mount and lower engine mount which improved the vibration a bit but still there.
I then changed the thermostat and water pump so engine runs at right temp but
still the vibration at idle.
Apart from that the engine runs well.
Also another thing, occasionally when steering is on full lock at idle, the idle drops so low the engine cuts out.

The ECU is not doing its job correctly because if a load on the engine drops the tick over speed below a set value the ECU should automatically bring the revs back up.

bl52krz · 26th June 2019, 18:47

Quote:

Originally Posted by KeithA

I believe the idle speed is about 780 rpm on diesels

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750rpm+/- 50rpm.

COLVERT · 26th June 2019, 19:15

Having had a read through these posts again the 600 rpm tickover is probably the cause of the vibration.----

Number 6 · 26th June 2019, 19:55

Quote:

Originally Posted by COLVERT

Having had a read through these posts again the 600 rpm tickover is probably the cause of the vibration.----

I do believe that the tick over can only be increased/decreased via aT4 or possibly Toaf

21st June 2019, 12:21	#1
Alan_M Regular poster Rover 75 Tourer + saloon Join Date: Apr 2019 Location: Newport Posts: 99 Thanks: 16 Thanked 27 Times in 21 Posts	Vibration at idle Hello, this is my first post as I have just bought a 2001 Connoisseur manual CDT tourer. I have been slowly reading through the forum to get a good idea about these cars. Now the one I’ve bought does have a few issues that need to be sorted and some areas I would like to improve. The first is engine vibration at idle. The temp gauge only goes to about half way between 7 and 8 o’clock. So I will be adding an in line thermostat and also looking to fix the fuel burning heater. My question is will the engine running cool effect idle as idle is about 600 rpm, or having looked through the forum is this more likely to be just the hydramount? I tend to do all my own spannering, so have no problems delving into sorting this car - just don’t know Rovers yet, so some learning required.

22nd June 2019, 11:18	#5
KeithA Loves to post Rover 75 Conny Tourer Auto Join Date: Mar 2016 Location: Essex Posts: 347 Thanks: 75 Thanked 94 Times in 71 Posts	I believe the idle speed is about 780 rpm on diesels Sent from my Redmi 5 Plus using Tapatalk __________________ 2003 Tourer, Connoisseur Auto

21st June 2019, 18:02	#2
markypicks Gets stuck in rover 75 saloon cdt club se re map 160 bhp Join Date: Dec 2018 Location: sheffield Posts: 558 Thanks: 227 Thanked 169 Times in 135 Posts	could be hydromount or bottom engine/gearbox mount i replaced my lower engine mount last year as the rubbers were all shot easy enough job my bottom mount cost me 40 quid original as well as for the in line stat i fitted one last year got it from dmgrs for 15 quid inc postage and works very well as same easy enough job the hardest part is cutting off the metal clip. as you go down hill the temp gauge drops to zero its a fault on the deisel cars it opens too early. or you could go expensive and fit a original but is awkward as its at the back of the engine and you will have to remove the water pump rgds mark

21st June 2019, 18:21	#3
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	The slow tick over and vibration at idle could easily be an injector not quite right.---

22nd June 2019, 10:56	#4
Alan_M Regular poster Rover 75 Tourer + saloon Join Date: Apr 2019 Location: Newport Posts: 99 Thanks: 16 Thanked 27 Times in 21 Posts	Thanks for replies. What should the idle speed be? Hopefully not an injector as I guess that’s the most expensive to fix. What is the best way to go about testing the injectors? Can you read injector values with something like TOAF, and would that show if there is an issue? Would a leak down test help? I’ve ordered a copy of RAVE which I should get soon, so I will have a look through that when it arrives.

22nd June 2019, 12:05	#6
genpk Posted a thing or two Rover 75 Saloon MGZT Join Date: Jul 2012 Location: Perth, AUSTRALIA Posts: 1,662 Thanks: 3 Thanked 461 Times in 299 Posts	i have diesel 75 and have always had the vibration at idle. changed hydro mount and lower engine mount which improved the vibration a bit but still there. I then changed the thermostat and water pump so engine runs at right temp but still the vibration at idle. Apart from that the engine runs well. Also another thing, occasionally when steering is on full lock at idle, the idle drops so low the engine cuts out.

26th June 2019, 19:15	#9
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	Having had a read through these posts again the 600 rpm tickover is probably the cause of the vibration.----