I recently bought a 2006 XJR as a weekend toy; I also have a 2003 XJ6 as my daily commuter car and I've noticed that compared to the XJ6 the XJR has quite a large dead zone on the throttle pedal, so it takes a reasonable amount of pressure/travel before it responds. It's not the end of the world, but it is annoying.

Any ideas?

Thanks

 

You can check the pedal assembly for debris or replace the unit. I believe it's an electrical unit that plugs in.

 

First suggestion is to disconnect battery for a few minutes. Upon reconnect, without starting ignition II position, depress pedal slowly all the way to the floor and hold 5 sec. Release slowly and allow to rest for 5 seconds. Repeat 3 times. Ignition off, and remove key. Then start the vehicle and drive. You can also use SDD as a diagnostic tool to track the voltage from the pedal. This is a drive by wire vehicle, and this procedure should be done every time the battery has been disconnected.

 

Thanks for posting this, Krak

And, thank you David for the fix.

My 07 XJR has identical (throttle dead zone) issue

 

Thanks, Box. I'll give that a go at the weekend and let you know how I get on

 

Most aren't aware of the required re-calibration of the throttle pedal after battery disconnect.

Process after battery disconnect is, throttle re-cal, audio code if required, set clock, park-brake re-cal, windows/sunroof anti-trap, windows one-touch. Then a drive for ECM adaptions.

 

is this the same with s type r ? it gives instructions on the message center to reset park brake but not any thing else .
mine seems to have a dead spot then a surge of power just after it , always has ! i just thought it was the second fuel pump kicking in . as it seems to be at around 4k rpm as well .

 

It learns all the time but it cannot hurt to try the recal mentioned.

 

It is applicable to all models. It is rather hard to provide complex diagnostics for you without ever seeing the vehicle.