How can you tell when pcv goes bad?

what are the Symtoms?

 

take it out and shake it,if it doesnt rattle it's gummed up and needs to be replaced. also if your behind the truck you will see small puffs of smoke when you take off

 

Don't see any smoke but engine vibrates and rpm goes down

 

V-8?...Passenger side on valve cover..pull it straight up and pull hose off...installation is reverse...you may want to check that same hose for cracks especcially behind the throttle body where it turns to attach to it...they crack and have a leak that affects the idle

 

What engine do you have,,, if it is a 5.4 ,, the are notorious for the rubber elbow on the pcv tube to rot apart and cause a huge vacuume leak, causing the engine to miss and stumble .

This elbow is behind the throttle body right up next to the firwall..
Find the PCV valve in the passenger side valve cover and then follow the plastic tube ,, this will lead you to the suspect elbow.

With the engine running,, being careful of moving parts, reach back and move the boot with your finger,, if it is bad you will feel the vacuume on your finger..

 

got the 5.4 engine

Let me go over to check the hose and elbow for cracks.

I'll be back