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98 Expedition - Oil in intake plenum? #5132477 06/12/19 04:39 PM
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Fitz98 Offline OP
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I took apart the plenum from the intake on my 98 Expedition 5.4 4x4.
The plenum appears to have a little oil lining the bottom of the plastic plenum. There was also oil around the plenum gasket and on the bottom of the intake manifold surface.
Is this normal?[Linked Image]
[Linked Image]

Last edited by Fitz98; 06/12/19 04:48 PM.
Re: 98 Expedition - Oil in intake plenum? [Re: Fitz98] #5132480 06/12/19 04:40 PM
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SirTanon Offline
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Sounds like perhaps an issue with the PCV


2013 Nissan Altima SV - 2.5 liter/CVT - 118,000mi
2014 Nissan Altima SL - 2.5 liter/CVT - 67,000mi
2010 Ford Fusion - 274,500mi
Re: 98 Expedition - Oil in intake plenum? [Re: Fitz98] #5132516 06/12/19 05:49 PM
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bdcardinal Offline
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Totally normal with a working PCV. This is why people put oil separators on so many cars.


2014 Ford Mustang GT Track Pack
1995 Ford Mustang GT

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Opinions expressed are my own.
Re: 98 Expedition - Oil in intake plenum? [Re: Fitz98] #5132844 06/13/19 02:33 AM
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LubeFiner Offline
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Could be the valve guide seals are bad.


2008 Jeep Patriot Sport FWD 2.4L 246K M1 5w20 HM M1-113

2000 Ford Expedition AWD 4.6L Cleveland 298K STech FS HM 5W30 FL-820S

1998 Dodge Grand Caravan FWD 3.8L V-6 163K C Mag-Tec 5W30 Fram XG16

Re: 98 Expedition - Oil in intake plenum? [Re: Fitz98] #5132872 06/13/19 05:43 AM
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Miller88 Offline
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On a 2V Modular, I'd place money on the valve seals being bad.


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Re: 98 Expedition - Oil in intake plenum? [Re: Fitz98] #5133265 06/13/19 02:48 PM
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Fitz98 Offline OP
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I cleaned the plenum with simple green solution.
Should I clean the intake ports with something, or just leave it as is?
Whatever I would use would probably need to be a spray, since the ports are hard to reach through with all the curves.
Another option would be to submerge it in a cleaning solution in a large deep pan or bucket

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