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Can anyone clarify for me about this sucking air issue on the vac advance?? If a steady state vacuum does not activate the advance - only an increase in vacuum then is there an air bleed to the "vacuum" side of the advance unit to allow compensation??? and if so is this the air i can suck...

Hi I have a 3.9L V8 Disco, it is running very rich and a little reaserch point to any one of the following: Air mass meter Engine temp sensor Fuel temp sensor Stepper motor etc: Can anyone give me the test date (i.e. volts cold / volts worm or Resistance cold / worm etc) so i can run tests...

What confused me was: "the device works on 'changing' vacuum rather than 'steady state' vacuum." Which lead me to think there might be a "bleed" of air to allow the unit to reset to nil when a steady state vacuum was present????

On a similar point - trying to test the vac unit and on my D1 3.9 i can draw air into my mouth when sucking on the vac advance / retard unit's pipe, its a very long time since i had a car with a distributor and i carnt remember if this is correct or if it indicates a punctured diafram ?? ANy...