SheepDog

I have recently replaced the Intake system on this truck and decided to change the TPS and clean the IAC. In the picture, sideways, you can see oil on the bottom of the upper intake where the Throttle body goes. I replaced the TPS and cleaned IAC, wiped out the oil and re-installed the throttle body. Drove it for a some time and removed the throttle body yesterday and, the oil is there again. I need some expertise on this one, where could this oil be coming from?

BTW, this is a 1990 F150 4x4 with 5.8L

Thanks ahead of time.

SheepDog

I posted the my question, as you can see, in May....someone please tell me why no one has answered?

sdmartin65

Blowby as motor âges

wheelz2902

iTrader: (1)

Take the photo to ford dealer and see what they have to say.

SheepDog

I could do that,,
Its just that these days, hardly anyone at a Ford dealership knows anything about older fords. Sometimes there is an old-timer still there that knows but most are on these forums. Figured one would chime in and know exactly what my problem is.

SheepDog

The first time I found the oil, it was fresh oil, from the fresh oil I had recently put in the engine. I am confused since there is a vacuum created when engine is running, sucking air from air-box. Not sure how it could end up where it is... no way it is coming from the air-box, I have removed the crankcase breather hose from the air-box. At this point, maybe an engineer could help...lol

sdmartin65

Where did you route the crankcase breather hose to?

SheepDog

I apologize for not answering your question sooner.. I didn't really re-route the breather hose, I just disconnected it from the air box and set it aside.

SheepDog

I have come to the conclusion that the leak is coming from the EGR There must be a leak under the new, newly installed intake. I am guessing the leak is at the exhaust port closest to the front, where the EGR tube comes off the exhaust manifold, on the passenger side.

Anyone disagree?

sdmartin65

Did it have the baffle in the intake under the egr tubing?
Is the breather hose plugged or just venting into the engine bay?

Edit. Scratch question #2 I was thinking 5.0.