PCV valves

TYHOGG

TYHOGG

Active member
Are the pcv valves in our trucks special in any way? My pcv intake on the drivers side is actualy pushing air out. I installed two new valves, but they are for a 93 jimmy not the typhoon (did not have any listed). I'm getting oil in the intake i can tell its comming from the pcv tube. i'm sure at boost it sucks up a lot more than at idle.

Does anyone know what could cause this, or what i can do to fix it. I believe the truck has done this since the day i got it.

Thanks for the help,
Adam
 
NecroWolf

NecroWolf

lost marbles member
Re: PCV valves

don't believe they're specific, if you're having a lot of air come out you might wanna a leak down test
 
SpoolingTurbo6

SpoolingTurbo6

Donating Member
Re: PCV valves

The one for the intake must open under VAC & must close under BOOST
The one for the turbo or (intake tube) must open under BOOST (why?) when the motor is in boost there is a lot of crank case pressure.Gm thought is was a good idea to vent this back into the turbo inlet. It's realy uesless!!!

You can vent you crank pressure with vent filters,But I would use the intake-to-valvecover PCV
IM000109.jpg
 
TYHOGG

TYHOGG

Active member
Re: PCV valves

Where can i find the sy/ty specific pcv's, i have been to autozone, carquest, napa, and pepboys, none of their manuals say they carry pcv's for the z-motor.
 
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