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Lower Intake Manifold Wet

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Old Oct 6, 2021 | 11:03 AM
  #1  
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Lower Intake Manifold Wet

Hi guys,

I'm getting ready for a 3k mile trip through Mexico and was doing a visual this morning of the engine, checking fluids, etc.

I noticed that the lower intake manifold circled below in the diagram was wet with what I believe is oil. I would imagine this is blow by oil? My thought is that if oil could get through, so could air. Is there a specific gasket that might be failing that I would want to replace in the near future? I don't have any drivability issues. Obviously it won't stop our trip, but thinking about future projects...

I have replaced the PCV and hose last year. I am uncertain if this wetness has been there the entire time I've owned the truck, or if it is new.

What I was having a hard time determining was how this lower intake "works"... does the throttle body connect directly to it and then the air swirls up into the upper intake? I am uncertain on the gasket(s) required?

 
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Old Oct 6, 2021 | 11:56 AM
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There are gaskets between the upper and lower intake. The lower intake is plastic and a pcv system sucking lots of oil can cause what you describe.
 
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Old Oct 8, 2021 | 03:39 PM
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So it certainly seems like it is just blow by oil, but seems weird it is seeping so much... I enjoy wrenching and was thinking about removing the intake to clean it of any oil/gunk while replacing gaskets and various other parts while I'm in there. With 210k miles, I thought I'd just go ahead and replace the following as "preventative maintenance". What do you guys think? (And yes, I'm very well aware of the "if it aint broke, don't fix it...")
  • Send off injectors for cleaning/calibration
  • New Injector O-rings
  • Intake Manifold to Head gaskets
  • Throttle body to manifold gasket
  • Cylinder head temp sensor
  • "Across the valley" hard line with new O-rings
  • Might as well do the fuel pressure regulator?
 
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