[sfetch]

I got the dreaded po171/174 cel code on my 2001 windturd. Per the numerous posts on this subject, I replaced the isolater bolts and gaskets. Thanks to the fellow with the website. I truly appreciate the effort put in the instructions for the repair. It was a breeze. I checked the valve cover for the hole and am pretty sure that mine doesn't have the hole. It's really difficult to see well through the pcv valve hole. As a result, I decided not to change the valve cover ($60 savings).

Here's my question: If missed seeing the hole and left a "bad valve cover" in place, should I anticipate seeing the dreaded CEL po171/174 down the road or different issue? Or does it not matter much? I'd appreciate any input. Also, If I need to replace the valve cover, do I need to use a silicon gasket sealant material with the replacement and what torque should be applied to the valve cover? My local autoparts never seems to have the Haynes Windturd book in stock. Must be a hot item.

Thanks for the help.