05 s40 whirring/whistling noise

clark0505 · Post by **clark0505** » 11 Oct 2018, 16:27

My s40 is making a whistling noise that stops when you remove the oil cap or dipstick. I am thinking it’s tje PCV system. Is there a write up for replacing this? I can’t seem to locate one. Thanks

Post by **RickHaleParker** » 11 Oct 2018, 23:19

If you suspect the PCV system, first do the PCV glove test to confirm it.
Make sure you tie down the glove with a zip tie so that it does not get sucked into the engine.
Limp = pass, Erection = fail.

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