I need your help.
I have a 2004 Jaguar XJR supercharged where the rear suspension falls over night. When I unlock my doors, the rear suspension goes back up but I am concerned that it is going to fail.
The front of the car seems to stay perfectly. Any ideas of where to start my search?

 

Do some research in this Forum. Its a common problem especially when temperatures cool down.

Can be caused by a leak in several areas and also a failing pump.

Finding a leak is fairly straightforward. Fixing it not so much and could be expensive.

 

I deny that suspension going down overnight is a "problem". The Owners Handbook actually says:
"A slight air loss is expected over time causing the vehicle to lower, so do not store or place anything under the vehicle if it is to be left for an extended period. "
Of course, they don't say how much is too much, and I don't know with my sample of 1, but going down overnight or within a day or 2 seems normal to me.

 

My suspension absolutely does not go down even after a few weeks in the garage.

 

The back of the car goes down if It sits for than a day. I never let it sit more than 2 days but the last time it was over 2 days, it was almost at the rear tires.

 

That is a problem. You have a leak somewhere.

Have a look at the below thread.

https://www.jaguarforums.com/forum/x...eather-211687/