High Pitch whistle, No carb cleaner leaks ANYWHERE.

[Indigo46n2]

This vacuum is causing misfire on 4 cylinders and it is loud under acceleration. Can't find the source with the hood up, sprayed every gasket and hose I could find. No smoke machines available near me.

With a rubber hose (fake stethoscope) behind the Intake manifold (bottom of CCV) I hear very slight wind, I cant spray underneath and upwards there but everywhere else around the housing seems sealed.

Is this normal? Or should I go ahead and replace the CCV. I've read it can be the source of many problems when clogged or leaky. Any tricks for diagnosing that doesnt require a BMW manometer I can't seem to find anywhere online?

[Zedbimmer]

This vacuum is causing misfire on 4 cylinders and it is loud under acceleration. Can't find the source with the hood up, sprayed every gasket and hose I could find. No smoke machines available near me.

With a rubber hose (fake stethoscope) behind the Intake manifold (bottom of CCV) I hear very slight wind, I cant spray underneath and upwards there but everywhere else around the housing seems sealed.

Is this normal? Or should I go ahead and replace the CCV. I've read it can be the source of many problems when clogged or leaky. Any tricks for diagnosing that doesnt require a BMW manometer I can't seem to find anywhere online?

Pull the manifold and change all gaskets including front and back.

Sent from my LG-G710 using Tapatalk

[georgebest]

Pull the manifold and change all gaskets including front and back.

Sent from my LG-G710 using Tapatalk

High pitch whistle is probably CCV, the problem with that that only genuine BMW works long term. I agree that I'd change all the manifold gaskets as well, not a big job and worth it.

[Mayorchuck]

Pull your dipstick to see if you hear gurgling and if there is a good deal of suction when you put your finger over the hole.