Hello!
I have a problem wirh my Jaguar XJ12 5,3 Serie III sometimes one half of the engine is not working probaly and the car has no power also in N or in D.
What should i check first? Has anybody some helps for me?

Many Thanks!

 

I've had this problem.

There's a strong chance that the wiring harness for the fuel injectors is failing, causing one bank of injectors to be inoperative.

Sometimes a 'jiggle test'of the harness will tell a story. Or use a 'noid light' to test the injectors and see if they're all working.

You can buy a new harness of make up your own

Cheers
DD