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Old 02-13-2012, 09:24 PM
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PCV problem, major stink!

Hi guys,

Just wondering if anyone has come accross this problem before.

Carbed Vortec 5.7.

Had no PCV when I bought it, leaked from rear main seal, and smelled terrible. Had two breathers, one on each valve cover, and the PCV hole in the valve cover was blocked.

Installed PCV valve, breather in other side valve cover, and ordered a black grommet to seal the breather hole on the valve cover with the PCV.

Joy, 3 weeks of driving with no leaks, and no smell. Happy camper.

then after 22 days, smell comes back and leaks return. I found the gromet they sold me to fill the hole wasn't oil resistant, and burst inward. It does appear to be intact tho, no bits of rubber came off that I could see.

Anyway, got a proper oil filler cap(oil resistant!) replaced the grommet and thought all would be well.

Its not. Smell is still there, and still have leaks.

I have checked PCV hose from carb, definately sucking. However it doesn't seem to be pulling the same amount of air in the other side where the breather is. It will hold a bit of paper against the vavle cover but not much more.

So question, should the breather side suck air in forcefully, or does it naturally lose some vacume as it makes its way around the engine?

Is there any other things that may cause this? I am fairly sure I haven't got a sudden extra dose of blowby (but it could be a suppose...)

Perhaps the valve cover on the PCV side isn't sealing properly, and its losing its vacume before its evacuates the crankcase? Does that sound possible?

Anyway, anything you can think of I will be happy to try, hate the smell, hate the leaks.

thanks guys

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Old 02-13-2012, 10:40 PM
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If the pcv valve is working properly, the vacuum will be regulated according to given positive pressure of engine. Thats the reason valve exists, to keep case pressure just under atmospheric. At full vac, oil would no doubt be drawn into intake.
I'm stumped as to stink you have.
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Old 02-15-2012, 04:14 PM
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Hi Shift thanks for the reply, I will keep lookin into it. I am hoping at this stage its maybe a vacume leak from vavle cover, but i have read some chev sites that indicate others are having this problem when using Valvoline or Castrol oils, both of which I have tried. I will keep it updated but thanks for your response
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