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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 5 Series > E39 (1997 - 2003)

E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 10-27-2010, 05:53 PM
yellowwing7 yellowwing7 is offline
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pcv-diagnosis

sort of tearing into the pcv valve, control valve for emission control, or whatever the bloody thing is called and looking for the "goo" or simply relying on a decrease in mileage, how do you know if you need to replace your pcv unit?
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  #2  
Old 10-27-2010, 06:03 PM
wolfen wolfen is offline
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Mein Auto: 97 BMW 540i
BMW has a oil separator valve or diaphram. When it fails you'll pull oil into the intake and have a huge smoke screen out the pipe. When it fails, you KNOW
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Old 10-27-2010, 06:05 PM
JimLev JimLev is online now
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If you can measure the vacuum level in the crankcase, it should be between 3 to 4.5" of water column if I remember correctly.
If the CCV isn't working properly you could have much higher vacuum level which can suck oil out of the engine.
Most DIY guys don't have a manometer, you can make one, just google "manometer"
Get another oil cap, drill a hole in it and screw a "1/8" NPT to hose barb" fitting into the hole. Or get a big rubber stopper that will cover the oil fill hole and put the fitting in it.
Connect the hose barb to the manometer and measure the vacuum in the crankcase.
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Old 10-27-2010, 06:07 PM
edjack edjack is offline
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A quick, and rather good, test is to place you palm over the oil fill hole while the engine is idling. You should feel a very slight vacuum. If it REALLY sucks on your hand, chances are good that the diaphragm in the valve has failed.
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  #5  
Old 10-27-2010, 06:14 PM
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Fudman Fudman is offline
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Or you can do the balloon test over the dipstick hole. If it inflates, you need to replace your CCV. Here's the DIY for the M54: http://www.bimmerfest.com/forums/sho...240&highlight=
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Old 10-27-2010, 09:44 PM
edjack edjack is offline
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Fudman,

Will a condom work?
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  #7  
Old 10-28-2010, 05:09 AM
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Fudman Fudman is offline
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Quote:
Originally Posted by edjack View Post
Fudman,

Will a condom work?
My understanding is it must be a lubricated one.
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