CDTi Lumpy at Idle

Mr bountyfull · 10th March 2019, 20:58

Hello to the technical minded. My 2001 CDTi manual as recently started to feel and be lumpy when sitting at idle (625 rpm approximately 620-640). Other than that the car runs fine, usual performance, economy, and mechanical sounds.

Is there anyone here had a similar occurrence, did it go away, what was it and if fixed what was fixed.

Regards Steve

trikey · 10th March 2019, 21:00

Have a look at all the hoses (including the vacuum ones) any leaks will have this effect.

marinabrian · 10th March 2019, 21:05

EGR, injector performance, ECM, wiring loom, it could be any or all or none of these

There is a canny tool for checking this kind of thing, can't remember what it is though

Brian

Mr bountyfull · 10th March 2019, 22:06

Thanks for the replies, I will get some injector cleaner, check the hoses etc. If there is no improvement maybe a T4 session is indeed needed.

75driver · 10th March 2019, 22:08

Quote:

Originally Posted by Mr bountyfull

Hello to the technical minded. My 2001 CDTi manual as recently started to feel and be lumpy when sitting at idle (625 rpm approximately 620-640). Other than that the car runs fine, usual performance, economy, and mechanical sounds.

Is there anyone here had a similar occurrence, did it go away, what was it and if fixed what was fixed.

Regards Steve

I thought idle for a diesel should be about 780 rpm.🤔

Sent from my iPhone using Tapatalk

RogerHeinz57 · 12th March 2019, 19:34

Quote:

Originally Posted by marinabrian

EGR, injector performance, ECM, wiring loom, it could be any or all or none of these

There is a canny tool for checking this kind of thing, can't remember what it is though

Brian

I think I have one of them too Brian ! (The canny tool)

genpk · 13th March 2019, 10:40

Ive had the same sort of issue with my diesel since i bought it but the car runs fine.
Ive seen similar posts from other members with the same idke issue.
Mine idles at the correct revs but just feels slightly rough at idle.
Only post ive seen that appeared to fix their issue was replacing the injectors.
The other irritating issue is somtimes when the steering is on full lock at idle,the car can stall, somthing to do with the power steering . Dosnt happen all the time though.

Mr bountyfull · 13th March 2019, 19:36

Nearest T4 to Newbury Please?

trikey · 13th March 2019, 19:41

Quote:

Originally Posted by Mr bountyfull

Nearest T4 to Newbury Please?

Probably Chris in Portsmouth..

https://the75andztclub.co.uk/forum/s...d.php?t=201841

cb750chris · 14th March 2019, 21:55

Thanks for the mention Trikey,
If Mr bountyfull fancies a trip to Fareham, I am sure we can have a look at what the problem is, see if we can sort it (I keep most spares that we could need)
Chris

10th March 2019, 20:58	#1
Mr bountyfull Gets stuck in MGZTV8 Join Date: Aug 2008 Location: Newbury Posts: 567 Thanks: 173 Thanked 82 Times in 58 Posts	CDTi Lumpy at Idle Hello to the technical minded. My 2001 CDTi manual as recently started to feel and be lumpy when sitting at idle (625 rpm approximately 620-640). Other than that the car runs fine, usual performance, economy, and mechanical sounds. Is there anyone here had a similar occurrence, did it go away, what was it and if fixed what was fixed. Regards Steve

10th March 2019, 21:00	#2
trikey Premium Trader Rover 75 Join Date: Nov 2010 Location: Devon Posts: 33,763 Thanks: 8,837 Thanked 14,831 Times in 8,030 Posts	Have a look at all the hoses (including the vacuum ones) any leaks will have this effect. __________________ Lest we forget..

14th March 2019, 21:55	#10
cb750chris Trader Rover 75 Tourer Join Date: Apr 2011 Location: Portsmouth Posts: 849 Thanks: 201 Thanked 292 Times in 200 Posts	Thanks for the mention Trikey, If Mr bountyfull fancies a trip to Fareham, I am sure we can have a look at what the problem is, see if we can sort it (I keep most spares that we could need) Chris __________________ Now offering T4 services in the Fareham area Replacement keys programmed / supplied / cut Diesel 135 upgrade available IPK virginisation and T4 matching available Sorry, due to a big change in home circumstances, I am unable to do any large jobs at present, but can still offer evening time diagnostics.

10th March 2019, 21:05	#3
marinabrian MG ZT Join Date: Jan 2011 Location: Newcastle Upon Tyne Posts: 20,151 Thanks: 3,565 Thanked 10,837 Times in 5,718 Posts	EGR, injector performance, ECM, wiring loom, it could be any or all or none of these There is a canny tool for checking this kind of thing, can't remember what it is though Brian

10th March 2019, 22:06	#4
Mr bountyfull Gets stuck in MGZTV8 Join Date: Aug 2008 Location: Newbury Posts: 567 Thanks: 173 Thanked 82 Times in 58 Posts	Thanks for the replies, I will get some injector cleaner, check the hoses etc. If there is no improvement maybe a T4 session is indeed needed.

13th March 2019, 10:40	#7
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	Ive had the same sort of issue with my diesel since i bought it but the car runs fine. Ive seen similar posts from other members with the same idke issue. Mine idles at the correct revs but just feels slightly rough at idle. Only post ive seen that appeared to fix their issue was replacing the injectors. The other irritating issue is somtimes when the steering is on full lock at idle,the car can stall, somthing to do with the power steering . Dosnt happen all the time though.

13th March 2019, 19:36	#8
Mr bountyfull Gets stuck in MGZTV8 Join Date: Aug 2008 Location: Newbury Posts: 567 Thanks: 173 Thanked 82 Times in 58 Posts	Nearest T4 to Newbury Please?