Anonymous asked in Cars & TransportationCar MakesFord · 6 years ago

88 F250 5.0 Oil in upper intake contaminating TPS ,What would be your guess as to why?

88 F250 5.0 with Edelbrock intake + BBK throttle body seems to be vacuuming oil from PCV into the upper intake .

The truck runs great it's just that every 4 - 6 months I have to put a new TPS in .

What would be your guess as to how I'm ending up with oil in my throttle body ?

3 Answers

  • CB
    Lv 7
    6 years ago
    Best Answer

    Malfunctioning or incorrect PCV valve would be my first guess. Maybe need a valve with a different vacuum weight?

  • 5 years ago


  • 6 years ago

    Crankcase pressure from combustion blow-by. Remember, 5.0L's have those 4mm metric piston rings (nototious for a short life span).

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