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    Game of Please Diagnose my Problem

    Hi, First thank you for all who Took the time took look at this thread.


    I have a 1986 325e BMW that's getting up there, but still have life in it. I'm trying to pin point a problem that i think in the end will end up being a sensor, but which..



    It had the problem of kicking and lagging, and bad ( you could push the gas down and it would bogg down and sit there, spiting and sputtering, and you'd either have to ease the gas off and then on, or wait..... and then it would run perfectly fine after that point for whatever gear or as fast as you want to go ) it did it only is lower speed and gear, and only on days when it felt like it (weather/temp/ humidity- i\m not sure) ... it would run great, then it wouldn't...

    More recently, that problem isn't there as much ( or noticeable ), but on simailer lines... I tried it a couple times tonight just to understand how exactly it's functioning.. it will idle normally around 600 RPM.... and then drop to around 300-400 (almost stalling), then rase to around 700 and drop to 300/400, and repeat itself.. (when it decides to do this, i smell it is running very very rich..) During this i'd push the gas so it would sit at 2000 RPM, and in the process it would drop down a bit (300/400 RPM) and sit there, poping and gurggleing a bit.... and after keeping it there for a couple seconds, it will rev back to 2000 RPM and idle at that compleately fine with no pops or anything... then i'd let go of the gas, and it would idle normally around 600 or so. but then after a couple seconds it starts reving up and down and drop to around 300/400 and back up to 700.



    when it decides to run like this/ if i hold the gas while driving, just at the point that it's not accelerating, but not slowing down, the car will some times violently kick, unless i raise/ or lower the Rev.





    This leads me to a sensor problem. I could be Wrong, but it just seems that way.

    So i was hoping you would know which one it might be :) or what is is.


    Thanks in Advance

    Allan

    #2
    Well that could be a number of things and the first guess would be an intake leak. Unmetered air can get in any number of places. It could also be a temp sensor, or the idle control computer, the ICV, your O2 sensor, the AFM, or even just you needing to adjust the valves. You need to get a bentley manual and start eliminating possible causes until you find the problem...it is the best investment you can buy for your car!
    The difference between porcupines and BMWs is that porcupines have the pricks on the outside!

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      #3
      I had this same problem. leaking intake manifold and one injector was bad.
      Gl
      Barry

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        #4
        have fun with the process of elimination!!! (Grin)
        sigpic

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          #5
          ignition coil dying?
          92 Opel Monza CLi 200i8v Exec
          92 Opel Rekord 380GSiV6
          87 BMW E30 335i (M30B35)
          91 BMW E34 520i (M50B20) with Mtech Turbines
          95 Hyundai Elantra with Mitsu 4G63
          Three Aircooled VW Beetles
          17.8Litres, 38cylinders, 10Cams and 84valves

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            #6
            Sounds like an AFM issue. I'd start there then the coil as a second option. The AFM can cause issues like your describing. The e39s and e38s have problems with their mass air flow sensors pretty often that show signs the same as your describing.
            89 325iX - stock but overflowing with factory extras
            85 324tdt -frankentrimmer

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