Mystery Machine

[det107]

I recall a 1979(?) Toyota Corolla that had a bad PVC & was letting oil into carbed air filter housing-

 

[jack333]

Update #2

All,
i have replaced the PCV, cleaned out the oil from intake to ensure if any other oil is identified in the system that it’s not just residual fluid from the first leak. I’ve driven about 50 miles on the new PCV and haven’t seen a decrease in oil on the dipstick. Mav sensor isn’t leaking any fluid either which was our first clue that oil was in the intake to begin with. It seems that the problem was solved by a 3$ PCV from O’reillys. These 3rd gen’s can surprise you. If s**t hits the fan again i’ll repost here for more advice. Trying not to get my hopes up.
Thanks

 

[toyotaspeed90]

I'm sorry, but the root problem isn't fixed.

A PCV is just a vent - allowing the pressure of the crankcase to vent to the throttle body. Oil does not normally contact the PCV aside from minor splashing around.


One simple test you should consider - start the truck and, while running, remove the oil fill cap. You should notice a slight change in how it runs, but nothing major. There should be slight pressure, like a light fan blowing, but nothing more.

 

[dogtail]

All,
i have replaced the PCV, cleaned out the oil from intake to ensure if any other oil is identified in the system that it’s not just residual fluid from the first leak. I’ve driven about 50 miles on the new PCV and haven’t seen a decrease in oil on the dipstick. Mav sensor isn’t leaking any fluid either which was our first clue that oil was in the intake to begin with. It seems that the problem was solved by a 3$ PCV from O’reillys. These 3rd gen’s can surprise you. If s**t hits the fan again i’ll repost here for more advice. Trying not to get my hopes up.
Thanks

Did you ever confirm if your oil light on dash is working, or did you get it working by now? Before with all that loss in oil, it should have tripped the light. Or were you overfilled? There's a wire that runs to the low oil pressure sensor/switch in area of the oil filter in the block.
That wire was broken off on a 3rd gen I bought that was running with only 1 quart in the oil pan. So the light was never tripped. I think I recall it was the tab on the switch broke off and I just replaced it from a parts truck I had. Easy to swap out, just unscrews out of block.

 

[jack333]

I'm sorry, but the root problem isn't fixed.

A PCV is just a vent - allowing the pressure of the crankcase to vent to the throttle body. Oil does not normally contact the PCV aside from minor splashing around.


One simple test you should consider - start the truck and, while running, remove the oil fill cap. You should notice a slight change in how it runs, but nothing major. There should be slight pressure, like a light fan blowing, but nothing more.

Still driving on it and oil hasn’t decreased one bit. I really do believe the PCV fixed my problem. Tried your test and sounded like a little fan.