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Old 06-11-2012, 04:28 PM
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bluebee bluebee is offline
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Location: San Jose, California
Join Date: Mar 2008
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Mein Auto: 02 BMW 525i M54 auto 130K
Originally Posted by Steve530 View Post
That might be caused by a diaphragm that is not closing off the vacuum port to the intake manifold hoses.
Very interesting analysis!

So, do BOTH suggested tests indicate a possible torn CCV diaphragm?

1. There is absolutely no resistance to blowing with a 1/2 inch OD hose inserted into the CCV upper vent tube, at idle, low speed, and at high speed.

2. There is 17.5 to 19 mBar (too high) vacuum at idle as measured with a 5/8" ID clear vinyl tube set up as a water manometer on the oil dipstick guide tube.

If the CCV diaphragm is toast, shouldn't I be seeing some sort of DTC error code or smoke in the exhaust (neither of which do I have)?

EDIT: I'll re-run the manometer test after using more string and/or wire to ensure parallel lines, perpendicular to the ground, as suggested.
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Last edited by bluebee; 06-11-2012 at 04:29 PM.
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