Quote:
Originally Posted by Derek UK
The hose from the oil filler cap should go to the air filter. Clean air enters the crankcase from the filter. If you have it going to the inlet manifold the engine sees it as a massive air leak.
The nipple on the manifold with the restrictor should route across to the side ear just behind the fuel pump. That hose should have a one way valve just above the ear. In this cross pipe there usually is a T piece that runs a hose to your servo. Check all of the illustrations in the workshop manual, hand book or what ever you have. This is a common problem. You showed evidence of it in your first post when you mention clamping off the hose from the oil filler cap.
Go back to square one and correct your hose routing.
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This depends on the vintage of the engine. Volvo reversed the direction of air flow in the PCV system on later B20s. I am not exactly sure when the change occurred; but, on my 1971 (and later) the air flow is from the air filter, into the oil separator box on the side of the engine, out the oil filler cap and into the intake manifold. Later engines did not use a PCV valve in the venting arrangement. Air flow is controlled by the all important restricting nipple in the PCV flow arrangement.
On my B20E there are separate ports for the connection to the brake booster and the PCV system (with different nipples on those ports). Later carb manifolds also had separate ports so no requirement for a Tee to the brake servo.