Quote:
Originally Posted by maytag
JFP, you've probably seen a bunch of these over the years, yeah? (I mean the cam plug popping out)
What's been the most common cause, in your experience?
If my opinion below was way off the mark, I won't be offended if you correct me, haha.
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These pop out due to pressure problems, either from a build up of crankcase pressure due to the loss of vacuum from an AOS failure, or due to unusual oil movement caused by a blocked oil passage or having the cam end plug come out. In order of commonality, I would go with AOS failure first, oil passage blockage second, and the cam end plug last. Again, this is why you need the digital manometer, with the car idling and the plug installed, little or no vacuum in the crankcase, or pressure build up, would point to the AOS.