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Old 06-10-2012, 11:38 PM
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bluebee bluebee is offline
Seek to understand,^Value
Location: San Jose, California
Join Date: Mar 2008
Posts: 25,236
Mein Auto: 02 BMW 525i M54 auto 130K
Originally Posted by Steve530 View Post
If the diaphragm is torn...the CCV and the vent hose would be at manifold vacuum.
Oddly, when I tried again, with the engine running and slight smoke coming out of the now open manifold, at idle, low speed, and high speed engine revs, there was still ZERO resistance blowing into the oil dipstick guide tube with a hose.

Q: What does 'that' tell me about the CCV diaphragm?

Anyway, while I was there, I decided to test the vacuum at the oil dipstick, which turned out to be just under 8 inches.

Here's my DIY based on RDL's explanation over here.

#1: I bought 7 feet of 3/4" OD x 5/8" ID vinyl hose.

#2: I slipped one end over the oil dipstick guide tube.

#3: Making a loop, I filled it with about a foot and a half of water.
Note: Less water bounced around too much with the engine running.

#4: Starting the engine, I measured the water delta to be roughly just under 8 inches:
EDIT: I need to test again, trying to keep the lines parallel to each other and perpendicular to the ground.

Here's a picture of the final setup in my carpeted garage last night.

So, may I ask:
Q: What does 8 inches of water at relatively cold idle tell me about the condition of the engine?
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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 04:57 PM.
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