M52 swap cranks/fires then dies, no idle

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  • ColonelMustard
    Advanced Member
    • Jun 2013
    • 120
    #1

    M52 swap cranks/fires then dies, no idle

    M52 swap, OBDII, had the ecu "flashed"

    The car cranks and fires up for a second, but that's it. Won't idle, but will fire every time I attemp to start.

    What's the most likely culprit? Vaccumm leak? Bad MAF? Bad ICV?
    1987 325 w/ M52b28 - Bronzit
    2007 X3 - Platinum Bronze
    Tags: None
    • 328ijunkie
      Forum Sponsor
      • May 2007
      • 3961
      #2
      Unplug maf and try again.

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        • ColonelMustard
          Advanced Member
          • Jun 2013
          • 120
          #3
          A few culprits. Spider hose wasn't connected beneath the manifold. And the throttle cable couldn't adjust enough holding the throttle body open some. Got it running well enough to make the first drive on the swap back from the exhaust shop.

          Sent from my SM-G920V using Tapatalk
          1987 325 w/ M52b28 - Bronzit
          2007 X3 - Platinum Bronze

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            • DMGSI E_TREINTA
              Member
              • Mar 2014
              • 55
              #4
              I'm having the same problem after taking a big bump. Car used to run perfect now turns and sparks but dies after if gas not pressed


              Sent from my iPhone using Tapatalk Pro

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