1979-1993 & 94 Conv [Subscribe to Daily Digest] |
Thanks! That's a lot of food for thought and investigation. With your experience, I wonder if you'd answer another questions or so on this. Concerning the crankcase ventilation. Far as I can see, there is no PCV valve. There's a medium-small diameter tubing from the manifold to the valve cover. It goes into the valve cover in a "Y" fitting with a much bigger diameter hose. That big diameter hose goes underneath the intake manifold down to a point underneath the big air intake just upstream of the throttle plate, and just ends there. It's wide open. I see nothing for it to connect to. This, of course, is a substantial-looking vacuum leak, though it doesn't affect the idle when I pinch off that vacuum leak. This does not seem right, for the following reason. That medium-small tube from the intake manifold to this "Y" where it enters the valve cover has a check valve in it. I read that the check valve is there so that when the turbo pressure goes positive, it cannot pressurize the seals in the crankcase and head. That's totally impossible in this case; any turbo pressure would blow right out that large hose that "Y's" into the valve cover with the PCV line from the manifold. I guess the question is, is there something missing on this setup?
I had the thought that I might determine whetehr I have a vacuum leak at all, by putting a rubber glove over the exhaust pipe and drawing on the whole system with a little air pump I have, which moves about 5 liters per minute of air and pulls about 10 inches of mercury (1/3 atmosphere) when totally choked off.
posted by 65.209.2...
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