In Reply to: 518i hard to start when cold posted by ken on March 31, 1999 at 22:49:02:
: My car is a 518i manual E34 1991 M40/B18 engine.
: I have to turn the key for a long time and accelerate to start the engine. When it is running the engine vibrates and when I accelerate it returns to normal.
: Someone told me it was cold starting valve or is it the injectors which are leaking. The engine makes clicking sound when accelerating or driving uphill.
: Does this car has a cold starting valve or is it another thing is not working well?
I'd bet your coolant temperature sensor has passed away. Not sure if the M40 also has a thermo time switch as it could be that too. On the M20 they were wired in series so either one could cause your problem.