How did you look down into the intake?

 

You can pull breather hose off and pull pcv valve out, put finger over both holes same time, if pcv valve hole has vacuum then def got plenum leak. Read this on here and worked on my truck. After the plenum fix I have positive flow out pcv. Some one correct me if I'm wrong.

 

How would that identify a plenum leak?

 

Easiest way to look into the plenum is open the TB and look in with a good light. If he has a blown plenum it will seep oil back up into the intake.

When mine junked, it had a fair amount of oil standing in the intake. Replaced PCV's and it still held fresh oil - replaced gasket and oil never came back...

 

Under normal circumstances..... there will be a slight bit of pressure in the crankcase, with PCV disable, and everything closed up. You would feel a breeze coming OUT of the open hole. (the tsb has you use a gauge to test....) If you have a vacuum from whatever hole you have open, while PCV is disabled, you have an internal vacuum leak somewhere.... in our case, it is 99% likely to be the plenum.

 

Easiest maybe, the right way? NO. The Dodge TSB test is a joke, as is opening the butterflies and looking. Remove the TB and look in all 4 corners with a small mirror and some light.

 

I just looked down the TB on mine..... of course, the quarter inch deep pool of oil was REALLY easy to see.

 

I've come to the conclusion that oil in the bottom of the intake is just because the engine is saving it for later.

 

Thanks HeyYou for explaining what i meant. When my lower plenum gasket was blown it was bad enough you could feel vacuum at the PCV valve hole without a gauge.
by pulling PCV valve out and plugging it and breather hole at same time. All conclusive way to check is, take some (get small pills) and lower yourself down into manifold with a flashlight. Just don't stay in there to long, pills wear off and your big again.