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Thread: E36 running super lean with black spark plugs?

  1. #1
    Join Date
    Jan 2018
    Location
    London
    Posts
    47
    My Cars
    1997 E36 323i Coupe

    E36 running super lean with black spark plugs?

    Hi

    I have been working on my e36 323i project for a while...


    323i
    M50 manifold
    36lb injectors
    Sc14 supercharger running around 6-7psi
    Intercooler so - 2ish psi
    328 exhuast still with cat
    Aem wideband sensor
    And loads of suspension bits..but they make no didference.

    So i have it all bolted together and trying to tune it with romraider. I have been given a few tunes for very similar set ups. They should all run the car pretty well, maybe need abit of tweaking, but should run.

    I have put a couple different tunes on but the car still acts the same.

    I know the tune is being flashed to the ecu as i had to do a ews delete on the ecu that is in the car now as i bricked the original one.

    So problem im having is...

    Everytime i start the engine it will idle for okay for a second, then drop down to 20-22 afr and run extremely lean. Misfiring and lumpy. I turn it off as i dont want to run it that lomg like that so i havent hot it to temperature yet.
    I have taken the spark plugs out twice now (in the space of maybe 10-15 starts) and they are covered in black.

    So my car is running super lean but spark plugs are black?

    I have check for vacuum leaks a million times with smoke, propane and takig every hose off and examining. (Still not saying its defo not a leak)

    But has anyone else got any more ideas of what it couod be?

  2. #2
    Join Date
    Jan 2018
    Location
    London
    Posts
    47
    My Cars
    1997 E36 323i Coupe


    Just a little video to show you my set up ��

  3. #3
    Join Date
    Jul 2004
    Location
    Houston, TX
    Posts
    12,462
    My Cars
    36 Cylinders
    It's most likely the tune and how it matches to your injectors and mass air flow sensor.
    -Abel

    - E36 328is ~210-220whp: Lots of Mods.
    - 2000 Z3: Many Mods.
    - 2003 VW Jetta TDI Manual 47-50mpg
    - 1999 S52 Estoril M Coupe
    - 2014 328d Wagon, self-tuned, 270hp/430ft-lbs
    - 2019 M2 Competition, self-tuned, 504whp
    - 2016 Mini Cooper S

  4. #4
    Join Date
    Jan 2018
    Location
    London
    Posts
    47
    My Cars
    1997 E36 323i Coupe
    Think ive sussed the problem. The map i had was running it so rich that it was missfiring. Sending unburnt air from the engine down the exhuast. Causing the wideband sensore to rean super lean.

  5. #5
    Join Date
    Jan 2018
    Location
    London
    Posts
    47
    My Cars
    1997 E36 323i Coupe
    I havent sussed it still having major lean readings. Its not the map. Anyone got any other ideas?

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