Hello Guys,
Sorry about the long absence. I have not driven the Jag for over a week because I am dog sitting and do not want him in the Jag since he likes to scamper around a lot.
Sean W, before I forget, the Indy mechanic uses a SnapOn code reader / clearer. I did not get the model number but he showed it to me and it appears to be about the size of a small laptop (maybe 11 inches or so). After he cleared my codes I had another incidence of the 1st gear lag that same day. Nonetheless I did not return to him again for 2 weeks per his suggestion. When I did return he checked for codes and none appeared. So I guess good news on that front but I still have the problem. So what did I decide to do?

Well to follow up on several suggestions here, I did do a hard reset. No harm seems to have been caused as a result. Certainly nothing obvious.
I also bought a CTEK battery monitor and hooked it up. It took an overnight charge to get my battery into fully charged status (green light). I now keep CTEK plugged in overnight or continuously when not using the car. I really like the CTEK and consider it well worth the cost.
(As a side note, I also bought an oil extractor and completed an engine oil and filter change).
In the meantime, I have been to several transmission shops as well as Indy mechanics. No one wanted to do just a transmission fluid level check. One shop told me that he did not think it was worth the risk of stripping out the fill plug just to check the level. Another guy told me not to do anything to the transmission unless the tranny reported a fault code or I saw a leak.???
Since the hard reset and CTEK monitoring, I have had one maybe 1st gear issue. I say maybe because it seemed to clear faster than the other times.
So at this point, I am strongly considering a full transmission service with fluid change of course.
Incidentally I saw a good YouTube video where a guy demonstrated transmission servicing on ZF trannys (in this case BMW 6HP26). He says that it is common for the ZF's to fail with the solenoids
and Mechatronic sleeves.
I will post again when I have a relevant update.

2010 XK Coupe 5.0L NA

 

While I don't have the same issue, I have what might be a related issue. This happened every day on my cross country drive. This ONLY happens after at least an hour or more of 75 mph+ highway driving: I'll be on the highway, all seems fine. I have reason to slow way down, but not stop. Exit, construction, etc. Let's say I take an exit ramp, slow to 20... as I merge into traffic and try to accelerate, the car lurches and "lugs" severely. It's really bad. The only way out of it is to go to the paddle shifters. Which helps but is still not great. If I pull over for at least a half hour, when I start up again everything seems fine. I'm thinking the lurching/lugging is maybe because the car hasn't dropped out of sixth gear? Is this possible? I'm at 10 years old and the car just passed 60,000 miles.

Also, in Sport Mode the car won't shift until red line. I'm sure this wasn't the case before.

To the OP I'd ask: have you tried driving the car in Sport Mode and seen if that makes a diference one way or the other?

 

PK4144,
No I have only driven in D mode. Since I had encountered my problem not long after purchase, I did not want to try Sport, Dynamic or manual for fear of experiencing yet another issue. I would prefer to get the current problem resolved first. But I may take your suggestion. Just maybe it might introduce a fault that will lead to the problem. Will update next week.

Getting back to your problem, take a look at the below YouTube video and let me know what you think.

If you can not get to the video using the above link, just go to YouTube and search on: Shopforlife ZF transmissions

 

Thanks for posting that video, saw him doing a ZF trans swap. Wow.
You may have found the answer to all your prayers. Just use him, seems very competent and full of enthusiasm that hasnt been raped out of him yet by the realities of commerce.

 

Your problems could also have been down to last owners driving pattern . IE slowly . And their is a procedure to reset gearbox or Ecu . it is this . enter car turn on ignition but do not start car , Then firmly press down on gas pedal for at least 30 seconds . It works I do mine every few month

 

George,
I'm curious, what is it that you notice after performing the above " reset" procedure you describe?

 

Queen and Country,
I am afraid commerce has already overtaken the enterpise. You can not reach them by phone. You can send questions via their website but they charge $5.00 per question (https://www.shoplifetv.com/index.php/product/question/). I have never seen that before, charging for questions. I believe they have transitioned into more of a performance shop specializing in BMW's.
But they are local to me here in the Los Angeles area. So I may just drive over and feel them out. I did think the YouTube video was very informative.
Thanks.

 

Metoymi,
He probably has some slacker friend who told him he can earn a living $5 bucks at a time. You better make use of him before he goes hundreds of grand in debt or he realizes what that tool truck extorts out of him ever month.

You should be able to impress upon him with a XKR both at a personal level and opening new doors.
Totally worth cultivating, he is young enough and shares your interests.
My expert mechanic is in his late 60's and as excitable as a prostitute.

 

car is "livelier" and i can feel the difference . Old tech told me that trick years ago

 

Somewhat important update to my driving experience.
Last night while I was out driving the Jag, the car again went into its "gear lag". I did not notice it as much at first because I was in traffic with cars ahead of me and I should have been driving near the speed I was at regardless of not upshifting. And I had the radio on fairly loud and so I did not hear any increase in RPM's as I usually do (Usually I can feel it though). But what I did notice for the first time was that the dashboard display had converted to a Sport Mode display. Instead of showing P R N D S as normal, it showed 1 2 3 4 5 6 with 2 highlighted in red (easily noticed because of dark background display at night). And I had time to focus on the dash display and then turn my eyes to the gear shift selector to make sure it was still set in D mode. And it was! A few seconds later the dashboard display returned to the normal P R N D S. So my conclusion was that somehow the gear selection dashboard display switched from normal drive mode to Sport mode and back to normal again. I have no idea why since I had not touched any dials, buttons, paddles, etc. I did have an A200 HUD unit plugged into my OBD port but it has been there for a couple of weeks.
I will continue driving to see if I can detect some sort of consistent pattern.

____________________
2010 XK Coupe 5.0L NA

 

Just guessing here, you could have a sticking paddle, try to use them a few times with the car off.

You know this but worth mentioning, I have hit the paddles accidentally many times.

 

Queen and Country,
I think you are right. I think I accidentally hit one of the paddles. Previously I had not intentionally touched the paddles while driving and so did not know for sure how they worked or in what mode I would be put in. But today while in D mode, I deliberately pressed the + paddle and I saw basically the same dash board display as before. So I am dismissing my experience from 2 days ago.

____________________
2010 XK Coupe 5.0L NA

 

When we first got ours, my wife called me in panic. "I had to pull over. The car is revving real high and when I step on the gas it is jumping! I pulled over and turned it off and now it's normal". I didn't know WTF was going on so we ignored it. Then a few days later, another call. "It's doing it again and the message center has numbers on it instead of letters!" That's when it clicked. You are entering manual shift mode my dear. I had to look up how to exit manual mode while driving though (pull and hold right paddle for a few seconds...) so she didn't have to pull over and re-start the car every time

 

Queen and Country,
If you liked the YouTube video I reported on previously, here is another one from a different poster that deals with transmissions "adaptations". I thought it was excellent. He presents in 2 parts.
His message maybe akin to what George05 suggests to reset the gearbox and monitor adaptations from a fresh start. The trouble is I do not know how it will be practical for owners to
be able to afford the equipment to ascertain and monitor the adaptations. I would appreciate your thoughts.

(Part 1)
(Part 2)


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2010 XK Coupe 5.0L NA

 

Metoymi,

I dont think you have a problem.
Could you be low on transmission fluid, a good probability.

There is one answer that solves a 100 riddles when it comes transmissions, refresh the fluid.
Do a 9qt fluid change, its something you have to do anyway and its overdue. Have them measure exactly how much fluid was removed. Inspect the fluid too if you can.
Drive it for a few hundred miles. Go back and have them drain some just from the plug or cooler lines and add even more fresh fluid.

 

This guy shows "how to reset" transmission

 

This is for pre 2002.

 

Well it works on my 2011

 

Yeah, that's a "Hard Reset", done by nearly everyone in this forum for a plethora of reasons.

 

Did you view the full video ? The procedure i am referring to is near the end , Were as a "Hard Reset" is disconnecting the battery leads and joining together we all know that