Seems to be a common issue, ive been having since I got the car where it lurches a little or jumps a little when coming to a complete stop at a red light.. Its a slight hindrance...

Anyway I spoke to a ZF specialist place in LA today as one forum member said he had his serviced at a ZF dealer in Europe and the reset the software and his issue went away..

Well as I was telling the ZF guy this today he cut me off and said a service would not fix anything at all. Then after explaining the issue he said very confidently without a shadow of a doubt that I need a new valve body?

I'd like to hear some of your thoughts on that, and also if anyone you guys know a ZF Authorized place around the Los angeles that would be great to get second opinion..

Cheers.

 

Search in the S-type section for 'the lurch'. All will be revealed.

 

Any threads in particular im looking for? Cant seem to find anything substantial on the issue?

 

Also just to note he asked med is there any fault codes etc for the trans.. I said no, none. To which he still implied this was for sure a valve body issue.. This is without seeing the car, feeling the issue etc.

 

Here's some good reading

https://www.jaguarforums.com/forum/s...-theory-24552/

 

Sad to see this has been an issue since 2003!! That's insane

 

It's fixed for most cars. My 2004 S-Type R has never had it.

 

What's the common fix though? Is it the fluid and software reset or is it the valve body (mechatronic) like all the tranny guys who say they are familiar with this issue are telling me..

 

The lurch still pops up from time to time so it's not a dead issue. My car has the latest everything but still suffers from time to time. I drive around it. As mentioned in the link provided, it's a software patch.

 

For some people a fluid/filter change fixes the lurch.

I opted to remove the valve body and open it up to install a Sonnax Zip Kit. I also replaced some of the other plastic and rubber pieces in the valvebody as well as a new oilpan/filter and fluids. Not only did the lurch (which was very harsh) go away, but the trans shifts much smoother and faster now.

06 Navigator 6 speed ZF Automatic Transmission Fluid Change Procedures - Ford Truck Enthusiasts Forums

Everything about your ZF 6HP26 transmission issues | BMW Logic7 site

These threads helped me a lot doing the research.

I bought the zip kit on ebay, and the rest of the pats from the Genuine ZF Parts (oil change kit with filter/pan and the rubber parts for the valvebody)

 

Nice did you do the work yourself? Also did you not need to do any software reflash etc?

 

I did the work myself. I did it in my driveway on jack stands.

I didn't reflash or reset the transmission. Though I hear that can help after doing the service.

 

God to know , so you had a pretty intense case of the lurch and this resolved it completely ? Anything else I should know? Thanks

 

It was very harsh, to the point that I felt like I might hit the person in front of me when coming to a stop. Yes it is completely gone.

If you do the service yourself make sure to get the mechatronic adapter seal and the 4 rubber pipe seals. It's in the ZF blog I posted before.

Opening the valvebody is very messy. Make sure you do it in a somewhat dust/debris free place and on some sort of clean table with a covering for the oil. I used a plastic tarp like thing that I cleaned before hand. There are some videos online about opening up the ZF 6spd mechatronics. I would recommend watching those a few times.

 

Thanks for all the tips, I wouldn't attempt it myself I can barely change a tire to be honest! But these tips are great to give my indie, and I definitely think this route is the way to go before changing valve body warranty or not..

Now another question in this case it seems obvious it's worth the shot but I seen a conflict between people on here and mechanics who say these transmissions generally shouldn't have their fluid changed in general .. What's the consensus on that between the respected posters here ?

 

You need a different mechanic-somebody that knows these cars. Fluid change is done every 50-60K miles on an XF and 80-100K on an S-type.

 

Yea I've seen that but there is conflicting reports even one of the jaguar dealers said that the fluid shouldn't be touched in the trans .. I believe you in just saying there seems to be a debate

 

ZF themselves call for fluid change. They make the transmission, I would trust them over Jaguar.

 

Good to know.

 

Jaguar's tech website for their dealers says to change it but some dealers can't be bothered to read.