quote:
Originally posted by chase_d
rush posting before work lol.
The issue is when you open the oil cap - there is a lot of air coming out (I read that this is called blow-by - and normal on most older cars).
The amount of air that was coming out, I assumed this wasnt normal, and researched and said it could be things from a PCV valve/worn rings/blown head gasket.
Car is in no state to drive to get a compression test done (nor am I going start jumping to worst case scenario), so was testing all i could - a PCV valve....but having a good look at my motor - all it seems to have is just a nipple with a hose going to the intake...unless i am wrong and am overlooking something (Highly Possible)
As you can tell, I dont know much about motors - and even less about MR2's
Many gen 2 3sge motors don't have a pcv valve.
Gen 3 3sge motors do.
My 90 model NA doesn't have one, only a hose running from the valve cover to the intake manifold, and I also have a bit of blowback if I remove the oil filler cap.
My motor has 223k kms and not using much oil. Recent comp test was very good.
I found this on Toymods car club forum, taking about gen 2 3sge blowby from the oil filler with the cap off:
“i've dealt with this more then a few times, i can say from experience these motors have a little blowby no matter what. They do not have a PCV valve, they do have a fixed orifice (pipe from head to throttle body).
The sump relieves pressure thru the oil return's from the head and out that fixed orifice pipe.
With a new set of rings the blowby is reduced but there is always pulsating pressure with this motor, if your not burning oil you shouldnt worry.”
Don't know how accurate it is, but if it's not I'm sure someone on here will tell us.