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Old 02-05-2009
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Bad PCV valve burns oil?

Hi Guys,

Just spoke with mechanic @ Kar King where I bought my engine and he said my PCV valve was bad which was causing the oil to burn off when the engine was turned on... Does this sound right? He said it should be fine now but there's some oil in the intake and it needs to burn out so he told me that it will take about a week or so before it's all completely burned out.

Does this sound legit? Or do you guys still think it's the valve seals?

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Old 02-05-2009
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Anybody?
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Old 02-05-2009
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The PCV valve is for Positive Crankcase Ventilation. When the pistons move the crankcase volume changes, and it is vented through your PCV. I have seen instances where a PCV valve will be clogged and it actually shot the dipstick out.
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Old 02-05-2009
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It could happen. Without the pressure release oil could be passed through the seals or as JP7 said the dipstick could be pushed out.
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Old 02-05-2009
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Awesome well, that's exactly what he said...

Clogged PCV valve, he changed it out with a new one and said it was so full that some got in the intake and it still might smoke a bit until all of it is burned out.
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Old 02-05-2009
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Can anyone else chime in? Bob? Zach? Earl? Gumby?
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Old 02-05-2009
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Throw a turbo on it. That will blow all the oil out. LOL
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Old 02-05-2009
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Quote:
Originally Posted by fddriver02 View Post
Throw a turbo on it. That will blow all the oil out. LOL
Lol and shoot nitrous through it? hahah
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Old 02-05-2009
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I would just run some intake cleaner through it then mash it to blow it all out.
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Old 02-07-2009
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Have you done a compression test? Some compression testers are really cheap and work good. I use a nice one that was like 150$, it has 2 gauges - one that reads pressure coming in from the source, and then the other shows a relative "leakiness" on the other end. If you have a leak you might want to buy a nice stethoscope and use it to trouble shoot while you take the heads off. I just repaired a VQ35DE that was burning oil, and didn't have any interior heat. It turned out cyl #2 was leaking thought the head gasket into the coolant. (I saw a clean portion of the gasket and knew it right away) - also cyl #3 had low compression because it had a crack in one of the rings, blowing oil into the exhaust, clogging the cat, and throwing a CEL. This was a guy who "bolted on a turbo" and didn't add any backbone to the engine, or retune the ECU - tisk tisk..

Back to your original question - if the PCV is clogged it could push some oil into the combustion chambers, but I think that you'd notice it somewhere else before there. Changing a PCV is easy, nothing to sweat. You could even do something smart, like hook up an oil catch can, so your intake dosent get all gunky.

Last edited by Jp7; 02-07-2009 at 04:34 AM.
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