pvc problem on 94 voyager

You mean "PCV", positive crankcase ventillation, and not "PVC", polyvinnyl chloride, a type of plastic.

What engine have you got in your '94? It matters...

Sorry about that i do mean pcv, I got the 3 litre engine with 155,000km.

OK, the 3-litre is very sensitive to PCV system condition. The valve needs to be changed periodically, but there are also *two* filters that need to be changed, one in the upper airbox and one in the lower airbox. All the hoses need to be inspected not only for cracks and leaks but also for clogging, same goes for the nipples and metal passages. The whole system needs to be very carefully gone through and examined and consumable parts (filters, hoses, valves) replaced every now and then.