running like a pig !

just saw this on the web........

Waxstat, also known as 'Expansion Element':
Helps control the idle untill the autochoke switches off completely. Is full of wax which is heated by coolant. As the wax expands a pin exends from the unit pressing a lever which brings the idle down. Check by throwing into a bowl of hot water, the pin should extend. This has been known to fix dodgy units as it 'resets' the wax apparently!

this was the web page ....

http://www.clubgti.com/forum/archive/index.php?t-124945.html

hope it helps,

just notice the time you posted........are you nocturnal

gt2-01's description of the waxstat is correct, but the waxstat can fail in one of 2 ways, either it doesn't open the throttle at all or it leaves it open a little all the time, to cause an increase when warm would mean that it had reversed its operation, as it works on temperature expansion this is very unlikely.

As to other possibilities, I would suggest that first you check all the vacum hoses, if there is a leak there that shows up more when the engine is hot, that would increase speed by operating the throttle plate actuator, the large disc like part on the drivers side of the carb. This normanlly opens the throttle until enough vacum is produced to pull it back in, if you then lost the vacum it would open again. To check the hoses you will have to take them off and examine them carefully, they will develop cracks in the rubber not easily visible on the car.

Hope this helps, will try to think of other suggestions if not.

Geoff

Changed the waxstat to no avail.
Will be checking all the vac pipes tomorrow. Will keep you posted !

ps. I was late to bed that night as the running problems were driving me nuts.