what could have caused this?

[hajinomoto1]

Originally Posted by old man roger

Sounds to me like the clean air mod was done incorrectly, when done correctly it will actually create a vacuum in the crankcase, not pressure.

This is a guess but it sounds like maybe some one didn't unplug the electric valve when they did the clean air mod, the valve needs to be unplugged to stay open or the system will build pressure.

THANK YOU OMR!

I did the Clean air mod in 2007 and never unplugged that valve...until today. BTW what would have been some other symptoms of over pressurizing the case?