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Thread: Really stuck on running rich problem

  1. #26
    Join Date
    May 2014
    Location
    Aurora,Co
    Posts
    75
    My Cars
    1986 635csi 2001 530i
    All good points, thanks
    Have replaced injectors with rebuilt flowed ones, all 6 plugs all look the same when pulled.
    Am tried 3 different O2 sensors , all correct, no change.
    Have discoed O2 sensors many times when trying to tune with AFM, car runs the same.
    Will look at order of fuel control sensors.
    Will try another battery disco and cable grounding.

  2. #27
    Join Date
    Dec 2005
    Location
    Melbourne, Australia
    Posts
    1,787
    My Cars
    M3evo-Twin Screw/M635csi
    I can’t emphasise enough to install a wideband and air/ fuel gauge. It will take most of the guessing game away.
    BMWs
    74 2002 2.3ltr
    84 E24 M635csi
    86 E23 735i
    94 E34 540i/6 SC 14psi
    97 E36 M3 euro SC

    OTHERS
    02 Landrover D2 td5, 08 Holden Ute 6.0, 11 Audi S5 APR


  3. #28
    Join Date
    May 2014
    Location
    Aurora,Co
    Posts
    75
    My Cars
    1986 635csi 2001 530i
    The air/fuel gauge does look tempting.
    I rarely drive the car, maybe 2000/year and I have to look at maybe a new exhaust.
    I'll be looking at some other things as soon as it gets below 95 degs here in Colorado.

  4. #29
    Join Date
    Jun 2015
    Location
    Wilmington, NC, USA
    Posts
    59
    My Cars
    1991 735 IL, 1984 733
    Jim Con, I have read through this thread several times and noticed some similarities to my problem (see thread on this forum) "All 6 spark plugs black and wet."
    My car is almost undrivable. Also mine's an 84 and I think the TPS is different. However we have both carried out the same tests and so far not found the solution to the problem.
    I'm not going to jump in to this conversation with a lot of questions or comments but I do have one question:
    My problem occurred suddenly, normal driving then running very rough in a split second. How did your problem occur?
    I will keep an eye on this thread and let you know if I make any significant progress on my car. Good luck, John Kenneth

  5. #30
    Join Date
    May 2014
    Location
    Aurora,Co
    Posts
    75
    My Cars
    1986 635csi 2001 530i
    John
    My problem started 18 months ago when I had my car smogged and it failed for too rich for 1st time in 10 years, ran fine to me.
    1st thought was O2 sensor, cracked manifold getting it out, despite WD40 soaking for a few days, had to put floor jack under cheater bar to get it out.
    Got manifold and new O2 sensor bung welded in, still failed.
    Used friends AFM, identical car, his ran fine, mine didn't.
    Used friend's ECU, no joy.
    My problem was gradual, yours was immediate.
    My guess would be some sort of electrical gremlin as yours went downhill quickly.
    Things that it might be, connections that need to be separated and sprayed with contact cleaner.
    Grounds that need to be cleaned up.
    Wiring that has cracked or split.
    Maybe plugs are not getting enough spark.
    Usual air leak problems, like accordion boot.
    Leaks downstream of AFM that fool computer into thinking it it's lean and then richening it up.
    Mine is driveable but not smog worthy.
    Good luck,
    Jim

  6. #31
    Join Date
    Sep 2005
    Location
    North Carolina
    Posts
    9,876
    My Cars
    '86 M635/'10 Clubman
    I just skimmed the thread, and searched for "cat" within the page and didn't see any references to the catalytic converter / cat. Getting mine cleared out made my car run much less rich and smoother...

  7. #32
    Join Date
    May 2014
    Location
    Aurora,Co
    Posts
    75
    My Cars
    1986 635csi 2001 530i
    Cat and new exhaust are on my next list, after various vacations are cleared out.
    Running rich for a while has probably killed mine.
    How did you clear the cat out???

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