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is there oil coming out of the hole with the OPRV removed?
from clarks garage " turned the engine over to verify that oil comes out the hole for the relief. If oil comes out of the relief hole, this indicates a problem with the relief. If no oil or very little oil comes out, this normally indicates a problem with the pump itself. If a problem with the pump is indicated, check for proper tension on the crankshaft pulley bolt. The crankshaft bolt applies force to a spacer which in turn tensions a gear that drives the oil pump. If the crankshaft bolt is loose the gear will not turn the oil pump. Low or no oil pressure can also be caused by a broken oil pump pickup tube. This is normally caused by excessive vibration when the motor mounts are bad. The oil pan must be removed to replace the tube. "
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