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Thread: Off Idle stumble

  1. 07-19-2006, 06:41 PM #1
    python1
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    Default Off Idle stumble

    Hi all I am trying to sort out a off Idle stumble on my 1994 525I M50 engine, Auto Trans. I have replaced coils , spark plugs, Oxy sensor, throttle position sensor, and intake temp sensor. up acceleration from a stop the engine stumbles and then it catches and takes off. any ideas on where to look from here?

    Thanks pan
    Thanks
    Python1
    1994 525i
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  2. 07-19-2006, 10:28 PM #2
    BillionPa
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    i can also see from a year ago you got new injectors, did the stumbling start occuring recently?
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  3. 07-20-2006, 02:39 AM #3
    genphreak
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    Quote Originally Posted by BillionPa
    i can also see from a year ago you got new injectors, did the stumbling start occuring recently?
    Perhaps the fabled 19lb injectors? I bet they are not the stock ones... and you do not have one of Mark D's chips right?

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  4. 07-20-2006, 09:35 AM #4
    Ausmpower
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    Air flow meter?

    Throttle position switch?
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  5. 07-20-2006, 12:47 PM #5
    t_marat
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    By stumbling you mean the engines starts coughing or it just hesitates?
    If just a hesitation, then it might be MAF.
    1994 520i with M50 engine, manual transmission and air conditioner.
    VIN: GG45422
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  6. 07-25-2006, 07:49 PM #6
    python1
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    No it has not it's been there the whole time. The injectors and Coils were my first attempt at solving the stumble.
    Thanks
    Python1
    1994 525i
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  7. 07-25-2006, 07:51 PM #7
    python1
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    It is just a hesitation
    Thanks
    Python1
    1994 525i
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  8. 07-25-2006, 07:52 PM #8
    python1
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    Just replaced the throttle position switch, intake air temp sensor, and the oxy sensor. new injectors and coils a year ago.
    Thanks
    Python1
    1994 525i
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  9. 07-25-2006, 07:53 PM #9
    python1
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    The injectors are stock rebuilt ones from http://www.fiveomotorsport.com
    Thanks
    Python1
    1994 525i
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  10. 07-26-2006, 12:33 AM #10
    genphreak
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    Quote Originally Posted by python1
    The injectors are stock rebuilt ones from http://www.fiveomotorsport.com
    Really? Did you confirm they sent you the BMW part... not the FOTE-D5B or other generic 'replacement' types? Five-O are the major source for those... part number is on the side of each injector; at the top. You sure the TPS switch is properly adjusted too; according to Bill Rs posts showing the correct BMW procedure from the TIS? Next step is to test the AFM output as you push the air flap open- is ti reading a consistent increase in resistance as you open the flap? This is a common cause of bad DME data. Nick
    Last edited by genphreak; 07-26-2006 at 12:36 AM.

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