Engine braking and burning oil:
Okay, so you rev the engine up to high (or kinda high) rpm's and are off the throttle to use that to slow the car down. High rpms + closed throttle = lots of vacuum. One of the PCV valves is connected to the upper plenum. Putting it after the throttle body exposes it to that high level of vacuum and what happens is that the engine basically sucks oil out of the crankcase and then burns it. Not noticeable amounts each time, but over time of consistant engine braking, it will add up.
I believe using breather caps for the PCVs should solve that problem, but I don't know if messing with the PCVs may cause the ECU to throw codes.
Okay, so you rev the engine up to high (or kinda high) rpm's and are off the throttle to use that to slow the car down. High rpms + closed throttle = lots of vacuum. One of the PCV valves is connected to the upper plenum. Putting it after the throttle body exposes it to that high level of vacuum and what happens is that the engine basically sucks oil out of the crankcase and then burns it. Not noticeable amounts each time, but over time of consistant engine braking, it will add up.
I believe using breather caps for the PCVs should solve that problem, but I don't know if messing with the PCVs may cause the ECU to throw codes.
