Why do you think your oil separator needs cleaning? Because your not getting as much smoke out of it as you were before? The sparator is just a sunken box in the top of the block that is covered with a tin plate with a hose ****** on it. The box is open to the back of the block where the vapor passageway is covered by the aluminum rear main seal holder. The passage up the back is zig-zag so that the vapor has time to condense on the cooler aluminum and drain back into the oil pan.
If you're worried about not getting enough flow through the PCV's path, blow some air into that 1/2" hose (towards the block, not the TB) and see if you get air to come out of the oil filler cap on the valve cover. If you get any air whatsoever, there is nothing wrong with that part of your system.
As far as not having much vacuum at the TB's bottom ******; you wont at idle. It uses Bernouli's principle to create a small vacuum when air is rushing through the TB. It does not use intake vacuum, caused by the piston going down in the cylinder with an intake valve open. Bernoulli's vacuum is caused by air rushing over a hole, whatever is in the hole is sucked (actually, it's pushed) into the stream of rushing air.
Tom
