wiring Diagram cold running problem

[Darren Stanley]

Hi

I'm looking at a UK 1988 300SL for a friend.

He has a cold running problem ( tick over at 500RPM)

He's changed the cold start valve still the same... it has a feed

I have put a feed across the idle control valve and runs better

I need the following info

1. a Wiring Diagram
2. wheres the over load relay on that year and model
3. wheres the ECU
4. Wheres the Temp sensor
5. wheres the earth for the IVC

thanks