Auto box problem

RAY OF THE ROVERS · 20th December 2018, 12:34

My cdti has developed a jerk when changing gears. It all started yesterday after a 20 mile run down the motorway, in which all was well until l left the motorway and got into traffic. This was when the jerking began. Did the same on the way back. I took it for a short run this morning, smooth as silk. Then after 15 minutes started again. It seems to only happen when it gets warm. It does it when l put it in drive, and through all gears, but third seems the most violent. Could this be the fluid thinning out when hot? Is it safe to use on short journeys? Trouble is l will have wait until new year now before l can get it seems to. Or change the fluid myself. Any feedback would be appreciated.

stocktake · 20th December 2018, 14:47

Hi Ray,
You need to get your multimeter out and test the solenoids, not a difficult job to do and with this type of fault it is usually the 2/4 brake solenoid that has failed. I think DMGRS has these for sale and they are not too difficult to change.
There is a how to on here showing how to test the solenoids and I believe there is also one on how to change the solenoid.
Dave...

RAY OF THE ROVERS · 20th December 2018, 16:37

Thanks Dave. Do the selonoids only fail when hot, as all works well when cold. I will read the how tos then l know wether it is within my capabilities. Ray

RAY OF THE ROVERS · 21st December 2018, 13:37

Just been to my allotment 1•5 miles away. The jolting started straight away when cold, but came back when warm nice and smooth. Also got a pm from Astraeus recommending rear engine mount check. Which l presume is the gearbox mount, this could also be the cause of my idling vibration. I have looked at the how to section and this is for the petrol 1.8. Is this a similar to the diesel auto, if so l think l will try taking the mount off to inspect for wear, which l presume it will have after 105,000 miles. Any tips would be much appreciated. Cheers Ray.

COLVERT · 23rd December 2018, 12:15

It could be the lower engine restraint but the jerking doesn't normally go away on its own.

Have you noticed the letters---EP--- come up on the lower instrument panel indicating an automatic gearbox fault ??

RAY OF THE ROVERS · 23rd December 2018, 12:50

I replaced the lower mount earlier in the year so that can be eliminated. Have been a couple of miles this morning, all nice and smooth again. This is what baffles me, if it was mountings surely it would do it all the time. I am going to have to check the selonoids plug with a multimeter, but will have to have crash course on how. I haven't noticed the EP sign on, but will definitely keep an eye out for it now. Need to sort it before using it does damage to innards.

20th December 2018, 12:34	#1
RAY OF THE ROVERS Avid contributor rover 75 tourer Join Date: Jan 2012 Location: Burnley Posts: 103 Thanks: 35 Thanked 13 Times in 9 Posts	Auto box problem My cdti has developed a jerk when changing gears. It all started yesterday after a 20 mile run down the motorway, in which all was well until l left the motorway and got into traffic. This was when the jerking began. Did the same on the way back. I took it for a short run this morning, smooth as silk. Then after 15 minutes started again. It seems to only happen when it gets warm. It does it when l put it in drive, and through all gears, but third seems the most violent. Could this be the fluid thinning out when hot? Is it safe to use on short journeys? Trouble is l will have wait until new year now before l can get it seems to. Or change the fluid myself. Any feedback would be appreciated.

20th December 2018, 14:47	#2
stocktake Vis Whiz Rover 75 2.5 auto Saloon Join Date: Jun 2007 Location: LEEDS Posts: 20,592 Thanks: 2,057 Thanked 3,056 Times in 1,621 Posts	Hi Ray, You need to get your multimeter out and test the solenoids, not a difficult job to do and with this type of fault it is usually the 2/4 brake solenoid that has failed. I think DMGRS has these for sale and they are not too difficult to change. There is a how to on here showing how to test the solenoids and I believe there is also one on how to change the solenoid. Dave... __________________ Dave... Lost a few stones and a Gall Bladder and part of a bile duct and all of my dignity in the suppository incident Last edited by stocktake; 23rd December 2018 at 06:22..

20th December 2018, 16:37	#3
RAY OF THE ROVERS Avid contributor rover 75 tourer Join Date: Jan 2012 Location: Burnley Posts: 103 Thanks: 35 Thanked 13 Times in 9 Posts	Thanks Dave. Do the selonoids only fail when hot, as all works well when cold. I will read the how tos then l know wether it is within my capabilities. Ray

21st December 2018, 13:37	#4
RAY OF THE ROVERS Avid contributor rover 75 tourer Join Date: Jan 2012 Location: Burnley Posts: 103 Thanks: 35 Thanked 13 Times in 9 Posts	Just been to my allotment 1•5 miles away. The jolting started straight away when cold, but came back when warm nice and smooth. Also got a pm from Astraeus recommending rear engine mount check. Which l presume is the gearbox mount, this could also be the cause of my idling vibration. I have looked at the how to section and this is for the petrol 1.8. Is this a similar to the diesel auto, if so l think l will try taking the mount off to inspect for wear, which l presume it will have after 105,000 miles. Any tips would be much appreciated. Cheers Ray.

23rd December 2018, 12:15	#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	It could be the lower engine restraint but the jerking doesn't normally go away on its own. Have you noticed the letters---EP--- come up on the lower instrument panel indicating an automatic gearbox fault ??

23rd December 2018, 12:50	#6
RAY OF THE ROVERS Avid contributor rover 75 tourer Join Date: Jan 2012 Location: Burnley Posts: 103 Thanks: 35 Thanked 13 Times in 9 Posts	I replaced the lower mount earlier in the year so that can be eliminated. Have been a couple of miles this morning, all nice and smooth again. This is what baffles me, if it was mountings surely it would do it all the time. I am going to have to check the selonoids plug with a multimeter, but will have to have crash course on how. I haven't noticed the EP sign on, but will definitely keep an eye out for it now. Need to sort it before using it does damage to innards.