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Thread: Bmw E38 99 750IL P0170 Problem

  1. #26
    Join Date
    Nov 2016
    Location
    Germany
    Posts
    19
    My Cars
    BMW E38 750IL Facelift
    Update:

    I changed all 4 intake manifold gaskets with new ones.
    Changes both front o2 sensors.
    Replaced 2 fuel injectors with new ones (the old have broke during the work.)
    Changed the Fuel Pump with new one

    Result is still the same P0170 Bank 1 to Lean and during idle the dme set the cel light.

    Anyone a idea what i can do now to solve this incredible Problem?

  2. #27
    Join Date
    Jul 2015
    Location
    Dallas, Texas
    Posts
    561
    My Cars
    98 750iL, 01 740iL
    i still have the same problems! did all the same work as you, but i also have P0170. i haven't done fuel filter yet.

    when your car is idling while warmed, and you press the throttle minimally, does your car shake at all? mine idles great but does not run well when i do this.

  3. #28
    Join Date
    Nov 2016
    Location
    Germany
    Posts
    19
    My Cars
    BMW E38 750IL Facelift
    I Have already done the Fuel Filter and the Fuel Pressure Regulator nothing changes.

    My idle is on P warm Bad with vibration
    In D less Vibration but still there.
    When i rev the car little bit its ok just little vibration.

    This Problem is so hard to solve i changed nearly evrything without success.

  4. #29
    Join Date
    Nov 2016
    Location
    Germany
    Posts
    19
    My Cars
    BMW E38 750IL Facelift
    Could a exhaust manifold leak on bank 1 be responsible for this issue?
    And if yes how i could locate this or find it out?

  5. #30
    Join Date
    Dec 2006
    Location
    San Jose, CA
    Posts
    1,124
    My Cars
    00 750IL, 01 740IL
    Quote Originally Posted by Cubehacker View Post
    Could a exhaust manifold leak on bank 1 be responsible for this issue?
    And if yes how i could locate this or find it out?
    Exhaust leaks can cause lean code due to oxygen gets in the path of the O2 sensor and it see it as "lean" condition.

    Sent from my VS995 using Tapatalk

  6. #31
    Join Date
    Feb 2010
    Location
    Hampshire UK
    Posts
    6,609
    My Cars
    99 840ci Sport Indv
    If you have INPA you can discover where the likely fault is from the adaptation values - they will inform you of the likelihood of the problem being due to fuel pressure or a vacuum leak - more information here:

    http://www.meeknet.co.uk/E38/Diagnostics.htm

    For instance - this post here:

    https://www.bimmerforums.com/forum/s...0#post29720430

    Shows a high positive Additive Adaptation but small Multiplicative Adaptation - a sure sign of a vacuum leak
    Last edited by Timm; 02-14-2018 at 05:06 AM.
    Timm..2007 E64 650i Individual Sport..1999 E31 840ci Individual Sport..ex owner of 2000 E38 740..1999 E38 740i V8 M62..1998 E38 735i V8..1993 E32 730i V8..1988 E28 518i


    My Current 840ci Sport Individual
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