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E36/7 Z3 (1996-2002)
E36/7 Z3 Roadster, Z3 coupe, Z3 M Roadster and Z3 M Coupe talk with our gurus here.

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  #1  
Old 09-06-2012, 06:22 AM
LydoZ3 LydoZ3 is offline
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Location: poulton le fylde
 
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Mein Auto: United Kingdom
Crank case vent valve question

Can anyone explain if it would be o.k for me to put a breather on the crankcase rather than it running to the pipe to the crank case valve or would it cause problems. I've seen some engine s with a breather instead of a pipe to the valve. My cars running rich and wondered if I just put a breather on the crankcase I would allow the engine to breath better but obviously don't want to do it if it will cause issues. Any advice would be great

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  #2  
Old 09-06-2012, 08:13 AM
Blacklane Blacklane is offline
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Location: Springfield, Ohio, USA
 
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Mein Auto: 1998 Z3 Roadster
If your engine is running rich, you have other problems. Deleting the Crankcase Ventilation (CCV) system will not change that.

It is very common for the CCV valve and oil separator to go bad, which causes the engine to burn oil at a rapid rate; that could be your problem. It's fairly cheap and simple to replace. You can check it by removing the oil fill cap and placing a piece of light plastic bag (such as a grocery bag) over the hole. The bag should be slightly sucked into the engine.

Technically, it can be removed; racers often do that. You will probably set some emission codes which will make diagnosing future problems difficult or impossible. You will also have to fit an oil catch bottle and drain it often. Without it, you will have a huge oil mess to clean up often, and you will be blowing oil all over the roads and driveway.
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  #3  
Old 09-06-2012, 08:51 AM
LydoZ3 LydoZ3 is offline
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It's not burning oil and I've replaced the ccv with a new one. I've looked for vacuum leaks and can't find any, it's driving me mad
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  #4  
Old 09-06-2012, 09:25 AM
Blacklane Blacklane is offline
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Location: Springfield, Ohio, USA
 
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With an OBD2 engine, there is not much that can cause it to run rich that won't be detected by the diagnostics. That's the whole point of having all of those engine controls and monitors: to make sure optimal efficiency is achieved.

If you have no codes set, you must be stuck in open-loop or warm-up mode. The computer thinks your engine is always cold. Check your thermostat for stuck open and/or coolant temperature sensor.
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  #5  
Old 02-16-2013, 09:48 PM
BK85 BK85 is offline
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Location: Colorado Springs,CO
 
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Mein Auto: 97 Z3 2.8
Quote:
Originally Posted by Blacklane View Post
If your engine is running rich, you have other problems. Deleting the Crankcase Ventilation (CCV) system will not change that.

It is very common for the CCV valve and oil separator to go bad, which causes the engine to burn oil at a rapid rate; that could be your problem. It's fairly cheap and simple to replace. You can check it by removing the oil fill cap and placing a piece of light plastic bag (such as a grocery bag) over the hole. The bag should be slightly sucked into the engine.
What would you replace if the bag doesn't suck or it blows off??
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  #6  
Old 02-17-2013, 07:59 AM
Blacklane Blacklane is offline
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Location: Springfield, Ohio, USA
 
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There is a pretty good description of the diagnostics here:

http://www.bimmerfest.com/forums/sho...d.php?t=445403

It's on the 5-series board, but the CCV systems are the same as the 3-series.
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  #7  
Old 02-17-2013, 08:58 AM
BK85 BK85 is offline
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Great link. Thanks a lot.

BK85
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  #8  
Old 02-21-2013, 05:23 PM
sangeej sangeej is offline
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Location: Nassau
 
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Mein Auto: 1999 528i
Repair CCV

Is there a kit to repair the CCV?
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