V70 2.4 L5-2.4L VIN 61 B5244S (2001)
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
