V70R L5-2.5L Turbo VIN 52 B5254T4 (2007)
Check:
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the vacuum hose connections at the manifold and the check valve
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that the vacuum hose is not crimped or rubbing anywhere
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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