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

 

I am not sure...but it doesn't sound good...could it be the pcv valve?....If I am wrong..its ok cuz I'm dumb when it comes to these things...lol

 

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.

 

That oil might have fouled up the MAF and/or the AIT sensor, might be a good idea to clean them. (the MAF is delicate, follow the directions in the FAQ post at the top of this forum)

 

Holy ***** I was right?....I just remembered it happenin on a carbed engine I had..lol didn't know if it is attached to the air box in efi motors...been a long time since I worked on any of em...lol