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Discussion Starter · #1 ·
I have a 2012 F150 ecoboost with 146000 miles. I have an oil leak toward the rear of the engine I initially thought was coming from the rear main seal, but turns out that is fine. I have a vacuum on the oil filler cap, so I replaced the PCV valve. That didn't work. Any ideas?
 

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Or if you have a dual valve catch can that capped off the CCV side and dont.
 

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Do you have any mods installed?

2012 doesn’t have the vacuum pump off the head. It has the electric pump behind the headlight. Most likely the valve cover gasket on the passenger side.

A vacuum in the crankcase would be caused by a restriction on the CCV side or PCV valve being stuck open. I would definitely get that fixed before taking it on a trip.
 
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