Terrible gas mileage?

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  • ashton
    Wrencher
    • Jan 2011
    • 240
    #1

    Terrible gas mileage?

    I have an 88 325i and its throwing the code for bad mass air flow sensor. It runs poorly. Could this cause bad gas mileage?
    I just rebuilt the motor. The head had 6 new exhaust valves in it along with it cleaned and checked. The valves tick at like 40+ mph. Do they need adjusted again? Or what? Let me know please.

    Thanks,
    Ashton.
    Last edited by ashton; 04-24-2011, 07:25 PM.
    Tags: None
    • MR 325
      Moderator
      • Oct 2003
      • 37825
      #2
      A bad AFM can definitely cause bad mileage.

      Not sure how you can base a valve tick off speed and not RPM...

      How many miles since the new head? Most likely yes they do need to be readjusted.
      BimmerHeads
      Classic BMW Specialists
      Santa Clarita, CA
      www.BimmerHeads.com

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        • MikeDE
          E30 Mastermind
          • Mar 2009
          • 1873
          #3
          http://www.r3vlimited.com/board/showthread.php?t=206152


          This thread may point you in the right direction.
          -03/2005 E46 330D Touring 6spd(204hp/410nM) Sapphire Black/Naturbraun Sport...300k KM & 35mpg(mixed)

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            • matt0300
              E30 Addict
              • Mar 2011
              • 549
              #4
              Sounds like a rwd. Ix haha

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