14th Nov 2011, 03:53
I had the same problem on the passenger side. I fixed mine by removing the door card (if you can do this without damaging the leather beside the chrome fitting on the door pull, you are a better man than me), and tightening a very obvious bolt that is close to the door lock mechanism. It secures the vertical channel the window runs up and down in.
6th Oct 2011, 15:39
I have an 89 XJS coupe and was able to fix the cruise control overspeed problem with the help of Kirby Palm's fine XJS manual.
It amounts to adjusting a small (very) potentiometer located on the cruise control electronics control board, under and behind the glove box.
See Kirby's detail instruction and you'll be on your way with a perfectly smooth transition at the set speed.
Ron Dionne.