[Gmecm] MAP and Vac

[Steve Ravet]

> I also spotted that, whilst idling, vacuum was constant and 
> had no noise on it. This changed when the fan kicked in, and 
> then went back to being constant when the fan switched off. I 
> don't understand why!

Electrical noise from the fan motor or circuit.  Try shielding the MAP
sensor wires with some tin foil to start with.  You may have to
rearrange the wiring, or replace the fan if the motor is too noisy.  The
MAP sensor may not be the only one picking up noise.

--steve


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