Wierd S50 Issue

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  • Koselowiec
    Noobie
    • Feb 2011
    • 22

    #1

    Wierd S50 Issue

    I have an S50 OBD1 swap in my E30 that has a weird issue I can't figure out.

    If I go WOT, it will pull fine, then bog down under load for a few seconds when I back off and try to cruise. I can rev it with the clutch in, and it will rev fine, but as soon as I put load on it, it bogs during that 20 or so second time frame. After that it drives fine as long as I don't go WOT.

    Today, I hit a larger bump and it did the same thing. Bogged, then after a while ran normal.

    I am thinking maybe the MAF is being sensitive, but other than that I am at a total loss.

    Idea's?
    '89 325i S50 Swap

    -Adam
  • CoClimber
    Member
    • Oct 2009
    • 80

    #2
    Fuel delivery? Pump, filter, etc. Just guessing.
    sigpic'87 325is, S50, Lightened Flywheel, Ground Control suspension, Strut Tower Braces, Roll Bar, Five point Harness, lots of little go fast things.

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    • Teaguer
      R3V OG
      • Sep 2004
      • 6167

      #3
      Under load would point to fuel starvation of some sort.
      But also sounds like symptoms of a maf going out.

      Is it throwing a CEL? Scan it for codes.

      E30 M3 / E30 325is / E34 525iT / E34 535i

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