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Car Idles fine, but dies when RPMS lower after accelerating

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    Car Idles fine, but dies when RPMS lower after accelerating

    So I just finished dropping in a working engine on my 318is.
    The car Idles beautifully, but after giving it gas and raising it above 3.5k RPM, the car dies as the RPMs lower. I have a check engine and at first it read 1215 so I cleaned the AFM and now I get 1222. Could it really be the 02 sensor? I changed it right before my previous engine died, so it has at most 100 miles on it. I also have a little bit of a oil coming out of my PCV. Not continuous drippage. Could that be related to the fact that the car isn't running well because something is throwing the AFM off?

    #2
    No way it's the O2 sensor.when an O2 goes bad,it just runs rich!

    Keep digging,could be a rumber of things..check for vacuum leaks
    NASA
    BMWCCA member
    PCA member 25yrs




    1991 318IS slick top
    1997 M3 sedan
    2001 325CI DD

    “whoever turns the wheel the least, wins"

    Comment


      #3
      Originally posted by e30s50dan View Post
      No way it's the O2 sensor.when an O2 goes bad,it just runs rich!

      Keep digging,could be a rumber of things..check for vacuum leaks
      So i haven't chased the hoses yet, my mechanic called while he did the swap and let me know that the old engine he pulled had the mess under intake mod and the new one he was dropping in didn't. So I told him to go ahead and transfer over the new hoses and mod to the new one. I bet he didn't follow a chart and misplaced a hose or two. I'm going to try to to go Sunday and chase the hoses using the chart and see if I find a misplaced hose. Considering the replys I'm 99% sure it's that.

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        #4
        Figures it out! My mechanic just misconnected a couple of hoses. No big deal, easy fix and it runs beautifully now.

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          #5
          Good to hear...it's always the easy things we overlook
          NASA
          BMWCCA member
          PCA member 25yrs




          1991 318IS slick top
          1997 M3 sedan
          2001 325CI DD

          “whoever turns the wheel the least, wins"

          Comment

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