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Old 04-08-2021, 04:11 AM
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wpoll wpoll is offline
Join Date: Sep 2015
Location: South Island, New Zealand
Posts: 3,661
wpoll will become famous soon enough
The number of ports varies from version to version (3, 4 or 5 ports). but it makes little difference - all the ports on the vacuum manifold are at the same vacuum level.

My M57TU has only 3 ports also (can't remember exactly though): -

1. Turbo Boost Vacuum Reservoir (then to Turbo Boost Pressure Converter)
2. EGR Pressure Converter
3. Engine Mount Pressure Converter

Pretty sure I don't have any vacuum line feeding anything on the intake manifold (swirl flap control etc.?)
2005 BMW X5 3.0d (b 02/05)
2001 BMW F650GS Dakar (b 06/01)

Last edited by wpoll; 04-08-2021 at 04:31 PM.
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