Bimmerfest - BMW Forums - View Single Post - How to test, clean, & redesign the original BMW dipstick guide tube (CCV vent clogs!)
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Old 06-09-2012, 01:26 PM
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bluebee bluebee is offline
Seek to understand,^Value
Location: San Jose, California
Join Date: Mar 2008
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Mein Auto: 02 BMW 525i M54 auto 130K
Here is a video of the faint, but clear, gurgling noise at the opening of the oil dipstick guide tube.
It's easier to hear the slurpee sound with your ears than with the video because of the background engine clatter.

Today [EDIT: with the engine off] I removed the upper vent pipe and blew on it, both directly and with a 1/2 inch OD hose (with some tape wrapped around the end for a tight fit). There was absolutely no resistance, and certainly absolutely no bubbling. (Did I do something wrong?) [EDIT: see Steve's response below - the engine should have been on].

To doublecheck, I put a hose on the dipstick guide tube and certainly heard bubbling when I blew on that hose directly into the dipstick guide tube [EDIT: with engine off]

I 'thought' my two possible results, when blowing on the upper CCV "vent pipe", were:
a) Infinite resistance (indicating a clogged steel vent tube or dipstick guide tube)
b) Bubbling of air into the oil sump (indicating a clear unclogged dipstick guide tube).

I did not expect:
c) No resistance whatsoever.

Did I do the suggested test wrong? [EDIT: yes]

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Since I had expected bubbles (and not zero resistance) when blowing back into the upper vent pipe connection ... may I ask if I did the test wrong? [EDIT: Yes. See Steve's response below; the engine should have been running.]
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Please read the suggested threads and add value, either by pictures or by descriptions, so the next person stands on your shoulders.
See also: E39 Bestlinks & How to easily find what you need

Last edited by bluebee; 06-11-2012 at 05:22 PM.
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