Date added: Feb 12 2009, 05:46 PM
Article starter: krh2
PCV valve replacement.
The PCV valve connects the crankcase to the intake manifold from a location more-or-less opposite the breather connection. Typical locations include the opposite valve cover that the breather tube connects to on a V engine. A typical location is the valve cover(s), although some engines place the valve in locations far from the valve cover. The valve is simple, but actually performs a complicated control function. An internal restrictor (generally a cone or ball) is held in "normal" (engine off, zero vacuum) position with a light spring, exposing the full size of the PCV opening to the intake manifold. With the engine running, the tapered end of the cone is drawn towards the opening in the PCV valve, restricting the opening proportionate to the level of engine vacuum vs. spring tension. At idle, the intake manifold vacuum is near maximum. It is at this time the least amount of blow by is actually occurring, so the PCV valve provides the largest amount of (but not complete) restriction. As engine load increases, vacuum on the valve decreases proportionally and blow by increases proportionally. Sensing a lower level of vacuum, the spring returns the cone to the "open" position to allow more air flow. At full throttle, there is nearly zero vacuum. At this point the PCV valve is nearly useless, and most combustion gases escape via the "breather tube" where they are then drawn in to the engine's intake manifold anyway.
The 2 PCV valves… $22 at my dealership.
Remove engine cover (10 mm)
Pull up on the rear of the cover to remove..
Passenger side PCV valve. Notice the oil around it…
Passenger side. Same oil residue…
Pull back the spring clamps…
Driver side Crank case hose removed..
The PCV valves are plastic and are 22mm. When installing the new valves just get them nice and snug not too tight
Valves removed and new clamps installed…
Now install engine cover and you are done!
Old PCV valve... Notice the difference in sound of the valve opening and closing?
New PCV valve....