PCV and oil cap question

[TStafford]

I had the smell of oil dripping onto the exhaust after driving my car. After not finding any leaks or oil on the exhaust, I thought maybe it was the PCV. I replaced the PCV, but as part of the testing process, I removed the oil fill cap and noticed that air was puffing out of the opening when the engine was idling. Is that normal? This happened before and after the PCV replacement. The hose is not blocked.

[Spuds]

Originally Posted by TStafford

I had the smell of oil dripping onto the exhaust after driving my car. After not finding any leaks or oil on the exhaust, I thought maybe it was the PCV. I replaced the PCV, but as part of the testing process, I removed the oil fill cap and noticed that air was puffing out of the opening when the engine was idling. Is that normal? This happened before and after the PCV replacement. The hose is not blocked.

Any time a fluid (gasses and liquids) has multiple ways to escape a high pressure location it will take an "all of the above" route. I haven't observed this specifically, but it makes sense that you would notice this happening.

[DarkPira7e]

Just to add onto this, is your car a manual? May be the rear cam plate. Passenger side rear of the engine, run a rag under there and I bet you'll find the source.

[TStafford]

The car is a manual. I will check the location you suggested for oil leakage.
The smell of oil seems to be gone.
The question is this: Is it normal (with a good or new PCV) for air to puff out of the oil fill tube when the engine is idling? This is tested with the cap removed.

[Opie]

Originally Posted by TStafford

The question is this: Is it normal (with a good or new PCV) for air to puff out of the oil fill tube when the engine is idling? This is tested with the cap removed.

Yes, it is normal.

Engine produce pressure, no engine is designed to be run with the oil cap off.

[TStafford]

The funny thing is, I got the idea from a YouTube video on how to check your PCV status.
I did what I think is the correct check, which was to shake the valve and see if it was stuck. Also, did it rattle like the new PCV?
The old one would rattle, but it was sluggish. Given the price of the new one and since I had to remove the old one to check it, I planned to swap it either way.
The car has about 50,000 miles on it.
SU003-06103 = $11.40

[ZC6_STi]

Originally Posted by TStafford

The funny thing is, I got the idea from a YouTube video on how to check your PCV status.
I did what I think is the correct check, which was to shake the valve and see if it was stuck. Also, did it rattle like the new PCV?
The old one would rattle, but it was sluggish. Given the price of the new one and since I had to remove the old one to check it, I planned to swap it either way.
The car has about 50,000 miles on it.
SU003-06103 = $11.40

Yep, its suppose to rattle brand new. Sluggish rattle is a symptom that it is about to fail. If it doesn't rattle, then the internal value isn't operating correctly. PCV is required to be replaced every 30,000 miles to fix the rough idle, and if there is a distinct oil smell. I replaced it with the WRX/STi PCV since it holds better pressure compared to the BRZ/GT86/FRS version.