Engine oil in air filter box
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Junior User
Joined: Sep 2005
Posts: 84
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From: Ajax, Ontario
Engine oil in air filter box
98 F150, 5.4L, when I went to change the air filter there was oil in the "tube" on the motor side of the MAF? sensor. I was wondering how it would get in there.
Thanks
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Senior User
Joined: Sep 2004
Posts: 385
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From: Missouri
Yes, the only way for oil to get that far from the motor is through the pcv valve. There is a hose (the lower one, I think), that is connected to your airbox from you pcv valve. Your pcv valve might be spitting oil from the valve covers into the box. Replace the pcv valve (only a couple bucks) and see if it stops. If it doesn't, find the necessary gaskets near the pcv valve and inspect for cracks in the valve cover.
Junior User
Joined: Jun 2006
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Originally Posted by fbodyfan
Yes, the only way for oil to get that far from the motor is through the pcv valve. There is a hose (the lower one, I think), that is connected to your airbox from you pcv valve. Your pcv valve might be spitting oil from the valve covers into the box. Replace the pcv valve (only a couple bucks) and see if it stops. If it doesn't, find the necessary gaskets near the pcv valve and inspect for cracks in the valve cover.
