Where is the location of the Pvc valve on a 2001 ford escort?

I am not 100% sure, but, may have a small black foam filter about 2cm square in the main air filter housing with a pipe leading down to the face of the engine block (front of engine under manifold). There you should find a small black box bolted to the block, this will receive the hose from the air filter housing. Inside this there will be a valve.This assembly is called the oil separator. All these parts make the PCV valve system (positive crankase ventilation)

To test - clean foam filter with methylated spirits. Remove oil separator and small valve. Valve should rattle when shaken. Flush out valve and separator with Carb cleaner. Check gasket, renew if necessary. Replace in reversal of removal.

It would do no harm to clean your EGR pipe and valve with carb cleaner whilst doing this.

N.B the PCV valve is under the exhaust manifold and access id HARD. So you may want to remove the manifold first.

Buy a haynes manual aswell this will help if you have the older Pulse Air system and not the EGR valve as associated pipe work makes getting to the PCV valve difficult. Hope this help. Not a difficult job, just take care and time.