PCV Valve - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 01-28-2005, 04:15 PM   #11
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Well, I thought about replacing the rear seal, but the car only had 128K on it, and I figured it would be good to go---wrong!

I have decided to pull the drive train out complete, then split the trans, bolt the engine to a stand and do some maintenance on it in my tiny little WARM garage. It needed the manifold work done anyway, so I figure I'll just tear the whole thing down and kinda go through it, checking things out as I go. It had a lifter tick, which I will want to fix, and it will give me the opportunity to change the bearings if they are showing any wear. It will get a new water pump and I want to do Chevythunder'* fix on the EGR pipe, too.

Off topic- sorry
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Old 01-28-2005, 04:17 PM   #12
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Hay John

You have a black o-ring that goes around the PCV valve and seals it in its bore. This o-ring can stay in the bore when the valve is removed and is hard to see, black on black. Without this o-ring you will have vacuum in the motor at idle. Remove the oil filler cap crank the car and put your hand over the hole. If your hand is held to the valve cover the PCV valve o-ring is missing or needs replacing.
When the o-ring is in place around the PCV valve it fits tightly in its bore. If you can remove or install your PCV valve easily with your fingers the o-ring is missing or needs replacing.

In Bills picture above it looks like the o-ring is still in its bore. You have to remove it from the bore and slide it on the PCV valve before reinstalling the valve.

L36 PCV valve kit comes with PCV-892C valve, black and large orange o-ring, spring and plastic cap.
Part # 89017274. $18. Dealer $11. Delco
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Old 01-28-2005, 04:32 PM   #13
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It does look like it - but there was no o-ring, the valve just lifted right out and I poked around in the hole and on the shoulder where the crimp sits to make sure. Should'a been there, but wasn't.
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Old 01-28-2005, 04:42 PM   #14
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Quote:
Originally Posted by ron350
Hay John

You have a black o-ring that goes around the PCV valve and seals it in its bore. This o-ring can stay in the bore when the valve is removed and is hard to see, black on black. Without this o-ring you will have vacuum in the motor at idle. Remove the oil filler cap crank the car and put your hand over the hole. If your hand is held to the valve cover the PCV valve o-ring is missing or needs replacing.
When the o-ring is in place around the PCV valve it fits tightly in its bore. If you can remove or install your PCV valve easily with your fingers the o-ring is missing or needs replacing.

In Bills picture above it looks like the o-ring is still in its bore. You have to remove it from the bore and slide it on the PCV valve before reinstalling the valve.

L36 PCV valve kit comes with PCV-892C valve, black and large orange o-ring, spring and plastic cap.
Part # 89017274. $18. Dealer $11. Delco
Sweet! Thanks! Sounds a lot like what I remember from when I replaced the thing myself. I'm actually gonna look into this on my lunch break in a few minutes...

I'm also guessing that having that ring missing may cause the MAP sensor to read wrong, which could potentially cause the EGR Valve to think something is wrong. The stuff I read in my FSM made it sound like my theory is plausible...
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Old 01-28-2005, 05:25 PM   #15
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I wanted to change mine. I see there is a black thingy on top of the supercharger that says PCV. I know it has to be up uinder there somewhere. How much is it and what does it do?
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Old 01-28-2005, 05:30 PM   #16
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Well, I found the O ring, put it back on the PCV, and no vacuum from the oil filler. No tools to pull the battery yet, so I still got the light for now....
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Old 01-28-2005, 05:57 PM   #17
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Quote:
Originally Posted by ssesc93
I wanted to change mine. I see there is a black thingy on top of the supercharger that says PCV. I know it has to be up uinder there somewhere. How much is it and what does it do?
its really cheap... i got mine at walmart for a few bucks... all u have to do is take the 2 screws off the black plate that says pcv (be carefull because there is a large spring underneath) and replace the pcv valve, if u still want pictures i could snap a few of mine when the snow melts a little
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Old 01-28-2005, 06:02 PM   #18
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please, that would e helpful. I like pics!
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Old 01-28-2005, 06:31 PM   #19
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Here'* a generic pic of a PCV Valve



It'* upside down and has an extra piece on it, but the silver part is a PCV Valve
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Old 01-28-2005, 07:30 PM   #20
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mos sorry but thats not off the sc engine... im probly gonna take some pics here in a little bit...
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