A $16.00 dollars mod for cleaner air especially at high RPM. For those who are interesting in testing this mod. While the engine is running at normal temperature, remove a hose that run from your intake rubber hose to the engine valve cover. You will notice that there are some smoke come out of the valve cover from the hose especially when you run at high RPM (This mean your engine will suck in this air which make your intake manifold dirty and poor gas mileage on the long run). For this mod, purchase a breather (small air filter) at auto part store and plug it into your valve cover (the filter will be your valve breather). Plug the other end of your rubber hose air intake with something.

 

do u have a pic?

 

Are you modifying the EGR system? It is designed to be a closed system.

This will cause the engine to run lean, as the fuel metering depends on the burning of the emissions you suggest makes the intake manifold dirty. The breather is not an air filter or an air cleaner..

 

he's talking about a breather filter for your PCV valve.

the only problem is, if something goes wrong, you're blowing oil out all over the engine, and potentially over the rear tires.

a catch-can is a better solution.

 

i agree. a catch can is the correct way to fix this as it will collect the vaporized oil in the can but also still depressurize the motor like it was originally designed to do.