3fe question (1 Viewer)

[TBetts]

Recently put a new motor with 140k miles on it. It was making a ticking noise so I took the oil cap off while running. Once the cap was loose the motor almost died then idled up for a second. When I put the can back out goes back to normal and will do that every time I remove the cap. I've never had this happen with any other motor. Has anyone had this happen before?

 

[cruiserdan]

The crank case is under moderate vacuum via the PCV valve. Removing the oil cap creates a vacuum leak.

 

[TBetts]

The crank case is under moderate vacuum via the PCV valve. Removing the oil cap creates a vacuum leak.
[/QUO

The crank case is under moderate vacuum via the PCV valve. Removing the oil cap creates a vacuum leak.

That's what I figured but I've never had a motor react that way when removing the cap. I'm not that familiar with the 3fe so I figured I'd ask. Thanks