Hello, I'm just wondering if anyone has a similar issue..
I find that if the majority of my driving for say a week and a half is mostly slow traffic driving my jaguar s type r starts to feel sluggish, the gear changes seem not as Sharpe etc and also as I have to use uneven lanes during some of my driving the suspension and steering don't seem quite the same..

 

Sort out the suspension - any decent mechanic should be able to figure everything wrong.

Check fuel trims (see existing posts) to see if there are engine issues.

 

I've ran diagnostics, but nothing shows up regarding suspension ie cats system or the engine etc.

I'll have too look up what the fuel trims should be if everything is OK.

It just feels like maybe the computer adapts to the most recent spell of driving,
I disconnect the battery for another job, followed all procedures etc to the book and the car was great, at its best, most of my driving for the first 400 miles after the disconnect was great progressive driving with occasional non sports mode kick down.
But as I say over the last say 100 miles, it's been mostly traffic slow driving and bumpy lanes.. It just feels like the car has lost something..
So as far as your concerned it won't be a learnt behaviour?

 

All manner of physical suspension issues need checking, none of which would throw codes.

Every time you disconnect the battery you mess up its learning. Let it learn and then look at the trims.

 

I believe these cars will modify its fuel trim and shift points etc. depending on how you drive. For instance if you drive like an old man eventually it will start giving you old man car driving characteristics but if you drive it like Jonny racer, Youll get a more aggressive driving profile. so it could be that you have been driving like the old man in the city and that’s what your car has adapted to. By disconnecting the battery you reset all those adaptations and that’s why it feels great right after you do that but as you continue to drive through the city it changes to the old man profile

 

Not really.

Disconnecting the battery has no effect on the trans learning.

But as I mentioned it resets the fuel trims.

Just stop doing that, let it learn for a while and then see what the trims are. If they're not good then straight away you have big clues.

 

Thanks alot for replies.

 

Looking at the codes in your thread (please don't keep starting new ones!) https://www.jaguarforums.com/forum/s...-codes-249701/

I'd worry most about P1410 - follow workshop manual.

Then when fixed see what happens - and be sure to check fuel trims (after checking all OBD monitors are set OK).

 

I did bit of research on P1410, seems like it's the flap on the airbox, so if this isn't working then the flap is staying shut and not letting cool air into the airbox? Guess for time being best to remove flap as some suggest?

 

Doesn't sound right.

 

What do you mean?

 

What you said.

 

you don't advise taking the flap off the airbox? Or you don't think the code is related to the airbox solenoid?

 

I'd follow the workshop manual and I'd definitely not take the flap off!

 

Have you known removing the flap to cause more issues?
Some people seem to do this as a modification... I'm thinking remove as more of a temporary measure until I can get a new solenoid, surely it's better that the flap is removed temporarily, rather than remaining closed at this time?

 

No. Besides it will NOT fix the problem.

 

I totally agree it won't fix the problem but I've removed the flap for now, car feels alot less bogged down, it seems the connector for the solenoid is damaged, so I'll get a new one on there ASAP and hopefully that cures that problem.

 

Is there any way to find out which wheel is responsible for the U1041 wheel speed sensor code?

 

Most of the time it wouldn't be open so that makes little sense.

 

obviously if slower town driving the air is gonna be hot from engine bay, but definitely on a quick blast it feels less bogged down, but as I say removing flap is temporary.