My XF 4.1 unleaded ute was running very poorly. I refreshed the carburettor and it is vastly improved, running sweet except when quickly opening the throttle in second and third in the three-on-the tree manual. I suspect that there is a vacuum leak at the site of the hastily removed and blanked off EGR valve, which I will get back to.
The carburettor looked like a mix of XD and XE parts. There was a wound spring on the throttle shaft, which is still there, and another about 5cm long attached to the throttle lever at one end with the other end looped around the nearby EGR bolt, which can't have been right. I am running the car without it and it has been fine. Is there meant to be another spring and what are the attachment points?