Engine knocking sounds

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  • chase
    Member
    • Oct 2003
    • 90
    #1

    Engine knocking sounds

    Ok, so my car sat for about 9mo's while i was at college. The oil was all gone when i got back, and put some more in, took about 4.5 qts :shock:

    Anyway, the engine now makes a bad knocking sound when run. What could this be? How can I check? Thanks!!
    Tags: None
    • Jordan
      R3V OG
      • Oct 2003
      • 12907
      #2
      Someone drained your oil, then drove the car.

      You have a spun bearing, most likely a rod bearing.

      Time for a new engine, or to rebuild yours.
      Tenured Automotive Service Professional - Avid BMW Enthusiast

      Vapor Honing & E30 ABS Pump Refurbishment Service
      https://mtechniqueabs.com/

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        • chase
          Member
          • Oct 2003
          • 90
          #3
          Ok thanks, just a little update.

          Now that the oil has gotten through the system, it idles fine, sounds ok, it only has the knocking/rattling on acceleration at around 2k rps.

          About the spun bearing. How much does a rebuilt on an m20 run? compared to how much for a new engine? Thanks

            Comment

            • slowboostede30
              Noobie
              • Jun 2005
              • 7
              #4
              new engine is $4600 from the dealer plus $2100 labor to install it. a rebuild shouldnt cost more than $1000

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