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Sanity check - vacuum advance
Bored out of my skull (ur-quattro not expected back until next Friday) I
started investigating the general malaises of the SO's Passat.
Apart from having the wrong plug caps fitted (they only rest on, but don't clip
to, the plugs) I found the vacuum advance doesn't hold vacuum.
There's also a vacuum-operated switch on the firewall. It looks like one of
these "change up a gear" light switches - but I've never seen such a light.
The hoses are fine - but the diaphragm in the distributor responsible for
vacuum-operated advance/retard doesn't hold vacuum _at_all_. Doesn't even seem
to try. I know a running engine can suck a whole lot harder than a MityVac,
but I would expect it to at least _try_ to hold vacuum. No deal.
This is a n/a I5 "JS" engine. Anyone had this fault?
UK Audi [ur-]quattro Owners Club