V70 2.5T AWD L5-2.5L Turbo VIN 59 B5254T2 (2003)
Check:
-
the vacuum hose connections at the manifold and the check valve
-
that the vacuum hose is not crimped or rubbing anywhere
-
that the vacuum hose inner weave has not broken and blocked the through flow.
Disconnect the hose. Start the engine. Check the vacuum.
Check the check valve