CDT Auto "Chugging" at lower speeds

Alanbp · 21st June 2019, 09:16

Hi Folks
I have noticed over the last few months that my 2002 165k miles CDT Auto Tourer does what I can only describe as "chugging" at lower speeds - especially when warm and slowing down. Classic occurance is when I have been cruising at 60 on an A road, come to a village with a 40 mph limit and as the car slow to a steady 40, it exhibits similar symptoms to being in a manual car in too high a gear. If I press the accelerator pedal it stops. Gearbox has fresh fluid in it and performs faultlessly (by & large) wondering if it might be fuel related? Its got a Ron Box on (last £12k miles) Need to try in sports mode to see if its better, ie change down sooner.

Anyone else had this?

Cheers
Alan

Vossy · 21st June 2019, 10:49

I have exactly this with mine, 2003 CDTi, it feels just as if it's locked into a higher gear at 30 mph, when it's in sports mode it doesn't do it, using sports mode does make these diesels drive a hell of a lot better (in my humble opinion).
I don't have a tuning box on my car though so I doubt that is the problem.

COLVERT · 21st June 2019, 18:25

Possibly fuel related due to slightly clogged injectors.---Poor spray pattern will show more at low engine speeds.---

Mickyboy · 21st June 2019, 19:13

Quote:

Originally Posted by COLVERT

Possibly fuel related due to slightly clogged injectors.---Poor spray pattern will show more at low engine speeds.---

Yep seen that many times, very good advice
Mick

COLVERT · 23rd June 2019, 20:15

If only these guys would come back and read the answers to their questions.----

Vossy · 24th June 2019, 09:11

Quote:

Originally Posted by COLVERT

If only these guys would come back and read the answers to their questions.----

Hi, I came back yesterday and read the replies. I didn't see the need to post any more details to what I added.

The next time I am near a T4 or I can get to one of the meetings I may have it looked at but seeing as I drive most of the time in sports mode it doesn't bother me that much.

21st June 2019, 09:16	#1
Alanbp Regular poster Rover 75 Tourer Auto Diesel Join Date: Mar 2016 Location: Aberdeen Posts: 54 Thanks: 0 Thanked 6 Times in 6 Posts	CDT Auto "Chugging" at lower speeds Hi Folks I have noticed over the last few months that my 2002 165k miles CDT Auto Tourer does what I can only describe as "chugging" at lower speeds - especially when warm and slowing down. Classic occurance is when I have been cruising at 60 on an A road, come to a village with a 40 mph limit and as the car slow to a steady 40, it exhibits similar symptoms to being in a manual car in too high a gear. If I press the accelerator pedal it stops. Gearbox has fresh fluid in it and performs faultlessly (by & large) wondering if it might be fuel related? Its got a Ron Box on (last £12k miles) Need to try in sports mode to see if its better, ie change down sooner. Anyone else had this? Cheers Alan

21st June 2019, 10:49	#2
Vossy Why? ... MG ZT+ Cdti Auto saloon. Join Date: Jul 2014 Location: Blockeswich, South Staffs Posts: 1,549 Thanks: 173 Thanked 483 Times in 330 Posts	I have exactly this with mine, 2003 CDTi, it feels just as if it's locked into a higher gear at 30 mph, when it's in sports mode it doesn't do it, using sports mode does make these diesels drive a hell of a lot better (in my humble opinion). I don't have a tuning box on my car though so I doubt that is the problem.

21st June 2019, 18:25	#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	Possibly fuel related due to slightly clogged injectors.---Poor spray pattern will show more at low engine speeds.---

23rd June 2019, 20:15	#5
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	If only these guys would come back and read the answers to their questions.----