Mark Carter
I was going down the line that the vacuum is generated by the operation of the valves/pistons against the throttle butterfly.
If the valve timing/overlap is not correct due to a loose belt the vacuum may not be to spec?
I always find it worth checking the general mechanical condition of the beast before I go to deep.
Mark
Modern cars, Its all wizardry and witchcraft
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Audi A2 1.4 AUA 2001 - Codes 65535 & 17566, possible ECU fault? - Fixed # - Lee Hemmings November 7, 2012, 8:30 am
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on November 8, 2012, 8:39 am, in reply to "