So I have a 94 Honda prelude si, with 40,000 miles. Last night I was checking my oil and everything turned out great but when I started my car, and for some reason I open up my oil cap ( with the prelude running) and I felt a lot of air coming out of where younput the oil. I checked my PVC valve and that is working perfectly. So I am kinda stumped. My favor to ask is if someone with a 4th generation prelude or any prelude could do the same as I did and just open their oil cap with their prelude on and running to see if all preludes are windy ing the top part of the engine or if I am experiencing some " blow by." and if anyone has any suggestions.

 

I did this once, a long long time ago, yes I also felt blow back.

This is why the PCV valve exists, its to take that air w/ fuel and recycle it (although with oil - search catch can)

Supposedly when the vehicle is revving the blow back shouldn't exist. But don't sweat, it's normal... now go finish cleaning the oil splatter from your engine bay

 

uh oh... cars about to go boom!

 

I believe if smoke comes out then that's bad lol

 

No boom and no smoke, at least not now. Thanks for the info