air comin out of oil fill.... - Miata Turbo Forum - Boost cars, acquire cats.

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Old 07-04-2006, 02:41 PM   #1
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Default air comin out of oil fill....

I removed my oil fill cap today while the car was Idling... and theres Air comin out... not just a little bit of air.... enough that I can hear it whooshing out.... This can't be good What's the problem?????
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Old 07-04-2006, 04:20 PM   #2
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do a compresion check, gonna go with that you have some blowby(ring(s) leaking)
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Old 07-04-2006, 05:03 PM   #3
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that shouldn't be a problem.... compression checked out just fine before the turbo install, and the car hasn't seen any boost yet... so I doubt that my rings are bad...
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Old 07-04-2006, 05:33 PM   #4
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Bad PCV valve.
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Old 07-04-2006, 05:44 PM   #5
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i'm hopin it's a bad PCV....
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Old 07-04-2006, 05:46 PM   #6
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I had a brand new one (fram) that was bad out of the box.
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Old 07-04-2006, 07:34 PM   #7
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but would a bad pcv cause pressurization at idle???? Imma go blow in it now...
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Old 07-04-2006, 09:34 PM   #8
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I missed that bit, so probably not since it shoud be under vaccuum.
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Old 07-04-2006, 11:12 PM   #9
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How's your driver-side crankcase vent hose routed?
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Old 07-05-2006, 03:13 AM   #10
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has a breather filter on it...
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Old 07-05-2006, 08:40 AM   #11
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Quote:
Originally Posted by airbrush1
has a breather filter on it...
Time to route it to the turbo intake after the AFM. But there is something else happening there that will require attention. i.e; rings, valves and stem seals
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Old 07-05-2006, 09:22 AM   #12
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that's normal... the whoosing isn't air pressurizing the crank case it's the sounds of the cams moving air and slinging oil. Every car I've owned with an oil filler on the valve cover has done this. It won't be turbo related since you shouldn't be boosting at idle. If you are I think you have far more severe problems to investigate.
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Old 07-05-2006, 11:54 AM   #13
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Yes, it could be enitrely turbo-related, as he has put a breather filter on the cam cover crankcase vent which, on the stock setup, would've had a constant vacuum on it...he now has no vacuum on it whatsoever, so his crankcase is likely building up pressure. I'm not saying it's the main cause of the air coming out of the oil filler cap, but I bet you $10 that routing the crankcase vent properly would cause it to drastically reduce the air build-up in the crankcase and cam cover.
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Old 07-05-2006, 02:24 PM   #14
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I'll try that this week! thanks much guys!
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Old 07-05-2006, 03:19 PM   #15
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Brian must be the worlds foremost advacate of venting crankcases into the intake path

not that there's anything wrong with it.
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Old 07-05-2006, 03:34 PM   #16
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Quote:
Originally Posted by braineack
Brian must be the worlds foremost advacate of venting crankcases into the intake path

not that there's anything wrong with it.
I know, I know I'm just trying to get the word out because it's not just done for emissions or for the hell of it...every car manufacturer (and every turbo and supercharger kit vendor I've seen, certainly those in the Miata community) can't be wrong.

I can't even recall how many folks we've seen come in here and the "other forum" that've asked why their dipstick was popping out, their turbo was smoking, etc.
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Old 07-05-2006, 04:10 PM   #17
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Hey I know, It has happened to me too. We are just constantly going over this again and again.
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