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Re: 9-5 4-cylinder PCV question [saabnow]
Posted by saabnow (more from saabnow) on Mon, 12 Jan 2004 16:47:33
In Reply to: 9-5 4-cylinder PCV question [saabnow], saabnow, Sun, 11 Jan 2004 10:47:20
Message from Nark Mason - http://saabnet.com/tsn/forms/e.php3?em=224
Subject: Re: 9-5 4-cylinder PCV question ================= > Ok lets start with the most concerning issue, yellow brown scum. > When you say that the dipstick kept coming up with yellow brown scum > on it did you mean a little on the sides up high or where the oil > normally adhears? If the oil you are pulling up at teh base of the > dipstick is the scum you speak of then you are mixing oil and water, > you have to figure out where the water is coming from. Often, > unfortunately, it is a bad head gasket. If you only have a little > scum up high it could be the cold weather is causing some > condensation. So need a little better description here.
If you've been making only short trips in cold weather then it's pretty common to get condensation in the oil, which will make a syrup colored emulsion. This is especially common in air cooled engines (like motorcycles). If you take the car for a drive long enough to get it up to full temperature then the water should boil off and the oil should look like oil.
It's not unusual for a PCV valve to pass a bit of air in both directions but do the proper thing under operating conditions. This appears to be why your car takes one specific PCV valve and not just any PCV valve - the flapper valve inside are weighted differently and/or they have different springs behind them (that's just a guess made after pulling a few apart wondering how they are different).
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