Car starts smoking up the second I hit the freeway?

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  • E30_Narek
    Grease Monkey
    • Sep 2014
    • 398

    #1

    Car starts smoking up the second I hit the freeway?

    Hey, everyone. I'm pretty sure I've asked this question before but I still can't find an answer. I've taken it to two mechanics and they can't seem to pinpoint it either. So my problem is that the car starts smoking whenever I hit freeway speeds. It smokes from under the car, not the exhaust. If I pull over, the smoke will start rising from the sides of the car. The smoke is from burning oil. The car does leak minimally from the oil pan gasket and the valve cover. But when I took the car up on a lift, there's oil all over the catalytic convert, all over the transmission, and some has even reached the diff. The diff itself isn't leaking, the oil on the diff is engine oil not gear oil. What I'm thinking is the car is leaking from somewhere and running along the undercarriage of the car and since it hits the exhaust, it's burning off. But where could it leak from that it'll run alongside the bottom of the car? All help is appreciated as I'm trying to avoid driving the car since it's losing a lot of oil and it's pretty embarrassing to drive on the freeway with all the smoke bellowing form underneath it.
  • TobyB
    R3V Elite
    • Oct 2011
    • 5163

    #2
    How's your crankcase vent?

    t
    now, sometimes I just mess with people. It's more entertaining that way. george graves

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    • barbierij
      E30 Fanatic
      • Sep 2012
      • 1294

      #3
      Is this an automatic? My 1990 iX would start leaking tranny fluid when I reached around 70MPH
      FS NY: two Audiobahn A235HC amps and audiobahn 1farad capacitor
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      Originally posted by K20RI_211
      And I have to ask if you make a hobby out of thread-bombing with retarded questions?

      Comment

      • zaq123
        E30 Fanatic
        • Jul 2016
        • 1364

        #4
        Originally posted by TobyB
        How's your crankcase vent?

        t
        + rear main seal, oil pan gasket, transmission output/input seals etc

        Comment

        • E30_Narek
          Grease Monkey
          • Sep 2014
          • 398

          #5
          Originally posted by barbierij
          Is this an automatic? My 1990 iX would start leaking tranny fluid when I reached around 70MPH
          Nah it's a stick.

          Comment

          • E30_Narek
            Grease Monkey
            • Sep 2014
            • 398

            #6
            Originally posted by zaq123
            + rear main seal, oil pan gasket, transmission output/input seals etc
            I know my oil pan gasket is leaking. I was thinking if I hit the freeway and it leaks, the winds would kinda push the oil onto the exhaust. That's why my exhaust has a black spot on it which I'm assuming is where the oil hits and burns off.

            Comment

            • MrBurgundy
              R3V Elite
              • Mar 2012
              • 5294

              #7
              Where is the burn spot? is the valve cover leaking?
              Current Collection: 1990 325is // 1987 325i Vert // 2003 525i 5spd // 1985 380SL // 1992 Ranger 5spd // 2005 Avalanche // 2024 Honda Grom SP // 2024 Yamaha XSR700 // 2024 Jeep Gladiator Rubicon

              Comment

              • E30_Narek
                Grease Monkey
                • Sep 2014
                • 398

                #8
                Originally posted by MrBurgundy
                Where is the burn spot? is the valve cover leaking?
                No the valve cover isn't leaking. The burn spot is right where the exhaust bends to run under the car. So basically after the headers and right before the cat.

                Comment

                • iwantspeed
                  No R3VLimiter
                  • Dec 2007
                  • 3164

                  #9
                  Try transmission vent pipe


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