w123 cold start problem

Hi,

Recently Ive been having trouble starting. Normally I just crank the
engine without touching the gas and the engine starts right away, but now I
have to pump the gas to get it started and then it runs very rough for a
short while. The same problem happens when the engine is hot. Once I get it started it runs
fine, idles a bit rough though. I think I have traced the problem to the
cold-start valve; when cranking the engine (coolant temp. around 60C) there
is no power on the valve connector.

Does anyone know where the temp. sensor and timer relay for the cold start
valve is located on a Euro 230TE 102. engine ?.

Thanks.