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Discussion Starter · #1 ·
I need some info on hooking up my PCV valve, I hooked it to my vacuum block and it idles up as if I have a boost leak. Should I just hook it directly to the intake or do I need some sort of orifice/check valve? If anyone has some info or pics of the pcv or whole vacuum setup I would appreciate.
 

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PCV always has 3/8" line directly to its own port on the intake mani,

OE had the (sucking end of) PCV sitting in one leg of a fat molded rubber 'Tee',
the bottom of the tee attached to the valve cover,
and the second leg of the tee going to the airbox
(for PCV action during boosted operation)

lol these 'Tees' are usually hard, brittle, cracked and leaking,
or missing and replaced by some PO bodge...
 

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R.I.P Dennis Jarvis
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Discussion Starter · #6 ·
just visible in this pic is the 'tee' I was referring to

th PCV valve (off-white plastic) is sitting in it;
silver clamp is tee <-> valve cover connection
I understand that, i have the outlet of the PCV hooked directly to my intake, sometimes it idles up as if it has a vacuum leak. My question is, is there supposed to be some sort of check valve on that line to prevent a leak at idle but still be functional when boosting?
 

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PCV Valve is a check/metering valve.
There is nothing else in that line.
PCV to intake(has its own dedicated source
Tee to valve cover
Btreather tube to air cleaner box
 

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Discussion Starter · #8 ·
PCV Valve is a check/metering valve.
There is nothing else in that line.
PCV to intake(has its own dedicated source
Tee to valve cover
Btreather tube to air cleaner box
That's how I've got it now. Thanks for the clarification.
 

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One option is to replace the valve cover with one of the cast TBI covers, They have two ports. Run a pcv of one to the intake and the other to the intake hose running to the turbo (on the draw through cars).
 

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PCV Valve is a check/metering valve.
+1 they are internally 'sized' differently too,
so the wrong PCV valve could let too much air through, behave like a vacuum leak

so, make sure you have the right one for your application.

anyone have suggestions on brands to use/avoid ?
I think I'm running a 'Standard'..
is this still available from ChryCo ?
 

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Chrysler made four different PCV Valves back in the 80's/early 90's(not including the 3.0L V-6)
6 cylinder/8 cylinder/4 cylinder turbo.
4 cylinder carburated
High pressue TBI
Low pressure TBI

The biggest issues were installing the wrong one on a 4 cylinder carburated car which lowered idle speed.
Then you would have to adjust the idle speed screw which opened the throttle plate enough to expose the main metering circuit to manifold vacuum pulling fuel but without enough airflow the fuel was not atomized and dripped and then your local unknowledgable shop said"needs a new carb".
After they replaced it and had the same issue they said "dam defective rebuilt carbs" and after putting on 1,2,or 3 more said "these carbs suck" all because of a wrong PCV valve.

I have beem using aftermarket PCV valves on my VNT for 19 years without issue.
 

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R.I.P Dennis Jarvis
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Jan in your pic showing the PCV connections where did you connect the hose that runs to the air box. Don't you have a cold air intake system?
 

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Thanks. I think I will get tap the 3/8" fitting on the Garett turbo so I can keep the cruise control and PCV valve operating correctly.
 
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