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Thread: 91 Running rich- I'm stumped...

  1. #26
    Join Date
    Oct 2010
    Location
    Sydney, Australia
    Posts
    833
    My Cars
    1997 840Ci
    Well done, I have been following this one as so much work was done.
    No mention of " removal of the ECU to replace the Chip to performance chips. " in original post.
    - - Updated - - -

    - - Updated - - -
    Last edited by sleepy81; 10-25-2016 at 02:28 AM.

  2. #27
    Join Date
    Feb 2005
    Location
    Calgary, Canada
    Posts
    1,116
    My Cars
    '91 E31 850i,'05 E53 4.4
    I thought I read somewhere that it didn't matter which DME module sat in the middle/front as they are reversible (therefore wire connectors could be switched instead of swapping module positions). Is this not true?
    I swear, my cars are like a girlfriend.
    Sometimes its a rough ride, sometimes its smooth motorin'.
    Sometimes she doesnt like how i treat her and sometimes i dont like how she behaves.
    BUT at the end of the day, she loves it when I am inside her.

  3. #28
    Join Date
    Sep 2008
    Location
    Santa Barbara
    Posts
    3,459
    My Cars
    91 Dinan860 & 91 850 6sp
    Quote Originally Posted by clockwork View Post
    I thought I read somewhere that it didn't matter which DME module sat in the middle/front as they are reversible (therefore wire connectors could be switched instead of swapping module positions). Is this not true?
    Yes, it is.

    The OP is going to find that the disconnect/reconnect of the ECU's reset his original problem & codes
    ... and it is likely to come back too

  4. #29
    Join Date
    Sep 2013
    Location
    Singapore
    Posts
    55
    My Cars
    1991 BMW E31

    BMW 850i M70 Engine Lean Mode

    Quote Originally Posted by Desmon View Post
    After changing Accelerator Pedal Sensor / Potentiometer which is very different to remove the securing screw at the rear using M10 socket and a small extension.

    The situation did not improve either.

    Something come to my mind, as in the forum someone mentioned before of swapping the ECU - Left Bank to Right Bank.

    Bingo , my limping mode problem is gone...

    Wonder if could be my error of fixing the wrong cabling during my removal of the ECU to replace the Chip to performance chips.

    After going through all checks...and almost gave up the Car..

    Anyway, happy now to move around with my bimmer without fear of it suddenly go into limp mode again and stuck in heavy traffic .

    Recently, the car lost power again and goes into lean mode with Transmission Fail Check Light on again.

    After checking - notice the VCV Air hose crack and leaking air into the MAF Hose.

    After searching , found the web info to share to all .

    http://bmwe32.masscom.net/sean750/vc.../VCVvalves.htm
    Attached Images Attached Images

  5. #30
    Join Date
    Jun 2012
    Location
    Uk
    Posts
    1,317
    My Cars
    1994 850csi rhd
    So Basically you had the oxygen sensors plugged in the wrong way around :-)

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