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Old 12-30-2012, 04:23 AM
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Beltane Beltane is offline
Location: Beautiful Small Town New Hampshire
Join Date: Jul 2009
Posts: 308
Mein Auto: 2003 325xi 5-spd
Originally Posted by DPP528 View Post

Here's my quick diagnosis (and I've written this in a few places on this forum already)

1. Take out the dipstick, examine the bottom (usually plastic and colored red or orange) if it for black sludgy oil residue, this is a sign of a failed CCV.
2. While the engine is idling remove the oil fill cap and then put it back on, make sure it't tight. While you do this listen carefully for changes or surges in the engine idle pitch, especially when putting the cap back on. If there's no change in pitch then the vacuum system may be faulty and it's usually due to a CCV failure. You can also remove the dipstick and listen for a change in the engine pitch.

A mechanic with the proper tools would seal a hose on the dipstick tube with a pressure gauge on it and look for negative pressure, if there's no negative pressure, change the CCV, it's not a particularly fun job but it's a common problem on these engines.
I can do that - thanks.

I don't believe the CCV has ever been changed.

2003 325xi 5-speed & 2009 Massey 1540 HST
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