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Very slow pulling away

7K views 18 replies 8 participants last post by  SlowSteve 
#1 ·
Hello. My F-Pace has developed a fault which at times almost dangerous. It has an auto box and When pulling away from rest, it is very sluggish as if it is trying to pull away in fourth gear. Using kick down works with a few seconds delay and off I go. I took the car to the main dealer who ran diagnostics but this showed no faults. They told me that new gearbox software was available and they would load it. This they did and reported back to me that the problem was solved. Of course it wasn't. I then took the car to an independent Jag specialist who again ran diagnostics and once again showed no problem. I suspect that having had new gearbox software that the problem may be with one of the many sensors and nothing to do with the gearbox.

Has anybody come across this problem before and can give me some ideas of how to get it fixed?
 
#2 ·
What model is it and how old, mine were never good from a standing start but never had to "kick down"
Others have complained of having to rev to 2000rpm to get moving, perhaps you could describe the symptoms more.
 
#3 ·
It's an R Sport 240PS. I'm lucky to get it to rev to 1000. The revs just won't climb up instantly. I'm thinking it must not be in the correct gear as kick down does change up enough to get me moving. I've watched the rev counter when coasting up to traffic lights or a junction and the gears do change up but never seem to get to a low enough one for pulling away.
 
#5 ·
Just check that the car is not in 'Eco' or 'Snow & Ice' mode as this reduces throttle response & sets off in 2nd gear. If all ok select Sport & or Checkered Flag mode & see if that helps. Lastly when you stop, select 1st gear with the paddle shift & see if that makes any difference. Otherwise you need to do a test drive with the mechanic to show him the issue. :cool:
 
#6 ·
It sounds like a throttle response problem rather than a gearbox issue, as said previously get an engineer to drive with you, they are usually straightforward and honest, it's the management that are dodgy.
 
#7 ·
Ok I tried all the various driving modes and whilst a slight difference was noticed in n sport mode, the problem still exists. Using the paddle I can select first gear or at least, first gear is displayed on the dash but I still get the problem. Revving the engine whilst in neutral seems ok.

When I took the car to the main dealer, the mechanic did come on a test drive. He agreed that there was an issue but having reloaded the gearbox software he reported that the problem was fixed but it isn't. So not getting much inspiration from the main dealer is the reason I took the car to the independent dealer.
 
#8 ·
Pacific688 I'm leaning to the idea that deltasierra suggested about throttle response. Whilst what you describe isn't exactly the problem I had it has similarities, post on here somewhere titled DPF full which was actually a red herring, nothing to do with DPF. What you possibly could have is a jammed valve in the throttle body unit. Only problem is, if you have, I'm surprised they haven't diagnosed it yet. It was the first thing the Jaguar Assist chap looked at when he came out to me. They even carry it as a stock item on the vans and it's not a small part. Apparently these valve's are prone to wear and tear and the unit fits numerous models across the JLR range. I'm probably wrong, normally am, but worth suggesting it to them. Have you had any warning messages on the dash, yellow engine symbol?

Hope you get it sorted.

Cheers
 
#9 ·
Did you ever get this problem diagnosed and fixed? What you describe is exactly the problem I am encountering. Scary at T junctions! No warning lights, engineers haven't picked anything up on their diagnostic systems. I have changed the gearbox oil but hasn't really helped.
 
#11 ·
I seem to be having the same problem. Did either of you with the same issue get a resolution? I'm getting a bit tired of playing roulette every time I pull out of a junction - will the car go, or won't it!

So far I've had it into a Jag specialist and they did an oil change on the gearbox, but that didn't solve the problem. I had them scan the error codes and nothing. The only thing I have found makes a difference is if I reset the adaptive learning on the gearbox, then it's smooth as silk for a few days before the problems come back.

Thanks.
 
#12 ·
Just to throw it out there, try checking the MAP (Manifold Absolute Pressure) sensor in the inlet manifold as the EGR system on modern diesels has a tendency to clog up the manifold and thus the sensor with sticky black tar-like goo. I'm not familiar with Jag 4 cylinder diesel engines though.
 
#13 ·
Thanks for the suggestion, IIRC the MAP is easily accessible so I'll take a look at that later today. I'm always optimistic that it's just a dodgy (cheap) sensor issue, rather than anything fundamental with the gearbox! The odd thing is that resetting the adaptive learning on the gearbox resolves the issue, so I'm thinking it might be electronics.

Thanks again, S.
 
#14 ·
A low reading from a clogged MAP often doesn't show any DTCs either, but the turbo pressure is in reality higher than being reported to the ECU, so the fuel injected and thus the mixture is very lean causing the low power issue. No idea if this is your problem, of course.
 
#16 ·
Pity, but ruled it out though.
 
#17 ·
In case anyone else has the same problem in the future it turned out to be a dodgy VVT solenoid.

I'd seen mention of a similar issue on another forum that was traced to the solenoid so it was on my list of candidate problems. At least it turned out to be a cheaper fix than some of the other things that could have been causing the problem!
 
#18 ·
Well found. How did you diagnose or did you swap and hope?
 
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