www.jec.org.uk

hi there,
my cruise control has stopped working. it was fine then stopped working suddenly. any ideas? Regards Scott

It could be a loose connection or a leak from the bellows amongst other things.

Hi Scott - it would be helpful to know some more details about your car as there are different systems.
For example, earlier V12 cars had the econocruise system and the usual culprit is the bellows in the vee that actuate the throttle. This seal between the end plates and the rubber bellows breaks down. Taking it apart and resealing with some silicone will usually do the trick. Otherwise look for a vacuum connection that has perished or fallen off.
Later cars used the Kliekert system and the usual fault there is the dump valve sticking open.
Hope that helps

For later cars, another failure mode is perishing/wear of the silicone washer that links the bellows pushrod to the throttle linkage.

Thanks, sorry its an 89 v12.. turns out it seems to be a loose connection on the throttle cable sensor..
Thanks again