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Breather box repair necessary? XC90 2004

posted by  Chris Mullet on  Sun Jul 17 08:44 CST 2022
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last visit: Fri Oct 24 09:08 CST 2014
[RELATED]

Does the whining disappear if you crack the oil filler cap loose or maybe pull the dipstick out? If so then it’s likely something PCV related, as you already seem to suspect.

The hose that runs straight up from the breather box to the top of the engine is known to split open, just above the box, with old age. That could create a whistling sound during moments of high manifold vacuum.






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