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Thread: 99 BMW 740i Cold Engine and Trans issues

  1. #1
    Join Date
    Oct 2016
    Location
    Indianapolis, IN
    Posts
    148
    My Cars
    96 750iL, 99 740i

    99 BMW 740i Cold Engine and Trans issues

    Hello all,
    I have a 99 bmw 740i 4.4L V8 that is currently experiencing a few odd issues. I have INPA and do have the issues it is stating for you guys. I will post them below but first I want to describe the issues.

    ENGINE
    When the engine is COLD, and only when the engine is cold, and I go to start it, it will idle fairly rough and then die, unless I give it gas. But then it still idles rough until the engine warms up a bit. Also, only when the engine is COLD does the secondary air pump kick on and it sounds horrible. I have a new one on the way. Finally, only when the engine is COLD do I hear a rattling noise when I give it gas, up until about 2000rpm then it goes away. When the engine warms up a bit this rattling is completely gone. Any ideas on any of these engine issues? I have no check engine light on. Only a SES light. INPA diag will be posted below.

    TRANNY
    I've noticed that the transmission hangs in gear for longer than it should. If I am cruising along at a lower speed (say around 30mph) and do not move the pedal, the rpm will occasionally dip a bit. I havent checked the transmission module for errors yet but will do so and post those issues below.

    A side note, I'm not seeing any options in INPA to reset the Pedal Position Sensor adaptations. The entire first 1/4 of me pushing the pedal down gives the car literally no power. In my 750 its much more responsive as I have relearned the PPS. Here are the codes for the engine:

    27 Adaption multipl. Area1 (Bank 2)
    28 LR-Adaption additiv per Time
    115 Hot film air mass meter --- I have replaced the MAF and still get this issue
    124 Intake air temperature
    26 LR-Adaption multipl. Area1
    141 Output Engine Fan
    140 Output Thermostat Map Cooling --- I have a new thermostat coming
    80 Secondary air system

  2. #2
    Join Date
    Jul 2016
    Location
    Chicago, Illinois
    Posts
    3,842
    My Cars
    are slow
    intake gaskets or maf

    ses replaced the cel

  3. #3
    Join Date
    Oct 2016
    Location
    Indianapolis, IN
    Posts
    148
    My Cars
    96 750iL, 99 740i
    Quote Originally Posted by XAlt View Post
    intake gaskets or maf


    ses replaced the cel
    Ill test for air leakage around the intake manifold. I bought a brand new MAF so id hope that wouldnt be the issue.

  4. #4
    Join Date
    Oct 2016
    Location
    Indianapolis, IN
    Posts
    148
    My Cars
    96 750iL, 99 740i
    Welp, I took off my throttle body and removed the gasket. The gasket as well as the the place where the throttle mounts at onto the intake manifold were caked heavily with what looked to be corrosion of some sort. There was also oil on the rear of the throttle body and plate. What would cause oil to get onto the throttle body??

    The odd rattling is also still present when engine is COLD. But once it warms up it is gone. The secondary air pump is very loud upon starting the cold engine. I am doubtful as to if it is even bad or not. Tranny still acts slightly odd.

  5. #5
    Join Date
    Feb 2010
    Location
    Hampshire UK
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    8,871
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    99 840ci Sport Indv
    Would that brand new MAF be a proper OEM BMW one - or a Chinese copy?
    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


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  6. #6
    Join Date
    Oct 2016
    Location
    Indianapolis, IN
    Posts
    148
    My Cars
    96 750iL, 99 740i
    Quote Originally Posted by Timm View Post
    Would that brand new MAF be a proper OEM BMW one - or a Chinese copy?
    Bosch

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