MG ZT CDTI Auto Gearbox

rikk · 3rd July 2018, 09:08

Hello, I have a small issue with the automatic gearbox in my mg ZT (diesel).

Sometimes, when it’s been in (R) reverse, when moving back to D (drive) it takes a while to go into drive, and when it does the car jerks.

It never used to do this, and seems to be getting worse. Any ideas what could be causing it? The car has 125k on it.

Thankyou.

paulonsite · 3rd July 2018, 16:04

Hmmm. Mine did this in 16/17, but only when first starting from cold. Wouldn't be an issue thereafter the whole day.

In my case it seemed to be gear box oil. At the 2016 service I bought Ford GAT (or something like that) from me local emporio de voitures and fed it in meself. In 2017 I let my mechanic buy his preferred / trusted OEM oil when he did the job and it hasn't happened since.

An eerily similar thing happened with my E46 auto, but I never got to the bottom of that.

That notwithstanding, my car ALWAYS jerks a little when going from P to D, e.g. on hill starts. It jerks a LOT if I feed throttle in when making the change. I, erm, don't do that now. Doesn't stop it from changing gear perfectly at all other times.

75driver · 3rd July 2018, 17:11

Quote:

Originally Posted by rikk

Hello, I have a small issue with the automatic gearbox in my mg ZT (diesel).

Sometimes, when it’s been in (R) reverse, when moving back to D (drive) it takes a while to go into drive, and when it does the car jerks.

It never used to do this, and seems to be getting worse. Any ideas what could be causing it? The car has 125k on it.

Thankyou.

Have you checked the auto fluid level?
That’s always a good place to start.
Has the atf ever been changed?
Might be worth doing so.🤔
Also, check condition of
- tear drop engine mount.
If it’s perished, that may also account for a jolt.

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Brunty · 3rd July 2018, 17:57

Change the auto transmission fluid, problem more than likely solved.

rikk · 3rd July 2018, 22:09

Thanks, the fluid was changed, about a year ago, could check the level though, not sure how likely it is to have leaked? Not sure if the temperate affects it, as just thinking this has only started recently when it's been not..?!

trikey · 3rd July 2018, 22:10

May need the cable adjusting, mine did this until I adjusted the selector cable.

75Connie · 3rd July 2018, 22:26

You ought to have the resistance on the automatic gearbox solenoids checked by someone who knows how the Jatco box actually works.

marinabrian · 4th July 2018, 17:06

Has anybody considered the possibility the bottom mount may be totally shot?

Just before anyone starts to use a sledgehammer to crack a walnut, worth a quick look

Brian

75driver · 4th July 2018, 18:01

Quote:

Originally Posted by marinabrian

Has anybody considered the possibility the bottom mount may be totally shot?

Just before anyone starts to use a sledgehammer to crack a walnut, worth a quick look

Brian

Post 3.....but sledgehammers are also good..😄😄

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rikk · 15th July 2018, 13:16

The bottom mount has been changed. Maybe it's the cable. It seems to be getting worse.Not good when reversing out onto a road , then want to go forward, and can take 5-10 seconds for drive to kick in !

3rd July 2018, 09:08	#1
rikk Avid contributor Rover 75 CDTI Join Date: Mar 2007 Location: Ashby de la Zouch Posts: 104 Thanks: 3 Thanked 2 Times in 2 Posts	MG ZT CDTI Auto Gearbox Hello, I have a small issue with the automatic gearbox in my mg ZT (diesel). Sometimes, when it’s been in (R) reverse, when moving back to D (drive) it takes a while to go into drive, and when it does the car jerks. It never used to do this, and seems to be getting worse. Any ideas what could be causing it? The car has 125k on it. Thankyou.

3rd July 2018, 16:04	#2
paulonsite Loves to post ZT CDTi Auto Join Date: Jan 2012 Location: Birmingham Posts: 294 Thanks: 93 Thanked 30 Times in 19 Posts	Hmmm. Mine did this in 16/17, but only when first starting from cold. Wouldn't be an issue thereafter the whole day. In my case it seemed to be gear box oil. At the 2016 service I bought Ford GAT (or something like that) from me local emporio de voitures and fed it in meself. In 2017 I let my mechanic buy his preferred / trusted OEM oil when he did the job and it hasn't happened since. An eerily similar thing happened with my E46 auto, but I never got to the bottom of that. That notwithstanding, my car ALWAYS jerks a little when going from P to D, e.g. on hill starts. It jerks a LOT if I feed throttle in when making the change. I, erm, don't do that now. Doesn't stop it from changing gear perfectly at all other times. Last edited by paulonsite; 3rd July 2018 at 16:09.. Reason: I was rambling....

3rd July 2018, 17:57	#4
Brunty Loves to post Rover 75 Saloon Join Date: Mar 2017 Location: Newtown Posts: 415 Thanks: 273 Thanked 95 Times in 65 Posts	Change the auto transmission fluid, problem more than likely solved.

3rd July 2018, 22:09	#5
rikk Avid contributor Rover 75 CDTI Join Date: Mar 2007 Location: Ashby de la Zouch Posts: 104 Thanks: 3 Thanked 2 Times in 2 Posts	Thanks, the fluid was changed, about a year ago, could check the level though, not sure how likely it is to have leaked? Not sure if the temperate affects it, as just thinking this has only started recently when it's been not..?!

3rd July 2018, 22:10	#6
trikey Premium Trader Rover 75 Join Date: Nov 2010 Location: Devon Posts: 33,769 Thanks: 8,837 Thanked 14,831 Times in 8,030 Posts	May need the cable adjusting, mine did this until I adjusted the selector cable.

3rd July 2018, 22:26	#7
75Connie Gets stuck in R75 Connoisseur CDT (116PS) Saloon Auto; R75 Connoisseur CDT (116PS) Tourer Manual Join Date: Jan 2013 Location: Athlone, Ireland Posts: 581 Thanks: 91 Thanked 75 Times in 58 Posts	You ought to have the resistance on the automatic gearbox solenoids checked by someone who knows how the Jatco box actually works.

4th July 2018, 17:06	#8
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	Has anybody considered the possibility the bottom mount may be totally shot? Just before anyone starts to use a sledgehammer to crack a walnut, worth a quick look Brian

15th July 2018, 13:16	#10
rikk Avid contributor Rover 75 CDTI Join Date: Mar 2007 Location: Ashby de la Zouch Posts: 104 Thanks: 3 Thanked 2 Times in 2 Posts	The bottom mount has been changed. Maybe it's the cable. It seems to be getting worse.Not good when reversing out onto a road , then want to go forward, and can take 5-10 seconds for drive to kick in !