slow starting 1.8 16v

[1.9mk1golf]

i have this problem where the car turns over really slowly in the morning , once the car has run , it is fine for the rest of the day, turns over as normal. the cold start valve has been changed but to no avail . i am no turning towards the thermo time switch, any help most grateful

[nhoj62]

cold oil that is maybe abit to heavy for the engine, maybe change to a lighter oil.

[yellow-160]

When was the oil last changed?? Id be tempted to agree the oil is to heavy or needs changed! Also make sure theres not to much oil in!!

[Crasher]

The thermo time switch only injects fuel via the 5th injector for as long at the starter is operating and below the switch operating temperature, up to a period of around 12 seconds. Aside from the ideas about oil viscosity I would check the battery is up to the task and that the starter is OK. One that often causes problems is the earth lead from the body earth point to the gearbox; these go high resistance and cause cold starting problems.