GMT 800 & Older GM General Discussion 2006 & Older Trucks | General Discussion

PCV comparo pics, what gives?

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Old Mar 2, 2006 | 09:54 AM
  #11  
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From: Arizona Bay
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Well I know you wouldn't be having the moisture in your oil if you lived here. That usually means a blown head gasket. Anyway, you would still see pressurizing of the crank case though. FWIW, if have the PCV valve on the left and just by looking at it, it's easy to see how it should close when the crank case is pressurized. Unfortunatley that's not the case. My crank case was pressurizing through the PCV and due to a faulty or an incorrectly installed solenoid valve my dipstick was poping off. When I tapped the dipstick tube on, it would leak out of my valve cover gasket.

So just to let you know your new PCV WILL leak under pressure. To fix this I left it hooked up and just ditched the solenoid valve. I have the pressure switch being activated off the TB and a breather on the valve cover vent. It works so far.....
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Old Mar 2, 2006 | 01:07 PM
  #12  
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From: Wisconsin
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Originally Posted by vanillagorilla
Well I know you wouldn't be having the moisture in your oil if you lived here. That usually means a blown head gasket. Anyway, you would still see pressurizing of the crank case though. FWIW, if have the PCV valve on the left and just by looking at it, it's easy to see how it should close when the crank case is pressurized. Unfortunatley that's not the case. My crank case was pressurizing through the PCV and due to a faulty or an incorrectly installed solenoid valve my dipstick was poping off. When I tapped the dipstick tube on, it would leak out of my valve cover gasket.

So just to let you know your new PCV WILL leak under pressure. To fix this I left it hooked up and just ditched the solenoid valve. I have the pressure switch being activated off the TB and a breather on the valve cover vent. It works so far.....

Keep me in the loop man, I'll post some pics of what I'm making when I'm done with it.

-Tim
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Old Mar 2, 2006 | 07:24 PM
  #13  
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From: Hackensack, NJ
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I was using the fixed orifice PCV for a while after reading a TSB about it. When I made a homebrew catch can I found out that quite a bit of oil still passes by it. Then when I got the AMW catch can there was this annoying whistling noise. I called AMW and they suggested that I try the traditional PCV and see if the noise goes away, which it did. So now I'm using the regular spring and plunger PCV, since I have the catch can for insurance anyway, and the whistling was driving me nuts. I was never a big fan of the fixed orifice PCV anyway...more of a band aid than a solution...and poor band aid at that.
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