Manifold Vacuum on a cold engine?

[B-Reight]

The wedge has recently become far to rich at cold idle for reasons unknown, it won't idle unless i give it a touch of throttle which i never used to have to do. CSI is uplugged and i haven't made any changes to the setup.

I've noticed that when the engine is started from cold the fuel pressure registers base fuel pressure, i.e. no vacuum refrence, as the engine warms (2-4 mins or so) the vacuum increases and thus the fuel pressure drops to where it should be. Should i have vacuum right from the instant i start the car or is this normal?

[convert]

Have you tried replacing the Coolant Temp' sensor?

[B-Reight]

yup, plugged in a spare coolant sensor and there is no change.

[B-Reight]

Mmm thinking about it the lack of vacuum is probably down to the aux air valve being open, probably need to look elsewhere for the problem.

[adam quantrill]

Disconnect the thermotime sensor which is the easy one to get to next to the coolant temp sensor.