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Thread: Complete loss of power

  1. #1
    Join Date
    Mar 2008
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    Caribbean
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    Default Complete loss of power

    I have a BMW 520i 1995
    M50 engine
    WBAHB620X0BG94472

    I am having some trouble and I might need my DME checked.
    It is a European type.
    Siemens MS40.1 not a BOSCH.
    Good place in the UK?
    The problem came on over a period of months and just got worse.
    I was driving it and the gears were shifting as normal.
    I took it to my man (BMW Trained) and he did the injectors, changed the plugs, plug coils, changed the fuel filter and checked fuel pressure , Mass Air Flow etc.
    At this point, he has checked every thing and every sensor.
    The problem only got worse because I drove it to his place and now it is stuck there.
    The car is starting and does not show any codes that would cause the problem I have.
    It did have a Cam Position Sensor Code, 132 I believe, but the sensor has been replaced.
    There are no fault codes now.
    I did have an “Air Temp” sensor fault code for a long time that never gave any problems but even that has gone away.
    It idles just fine but will not accelerate and has no power.
    It is not drivable.
    If I try to drive it, when I try to move off it just does not want to move.
    It will move but very slowly and if you persist, you can get it out of the garage.
    One interesting detail; My Indie tells me that sometimes the scanner looses connection with the DME but there is no "Communication" code coming up.
    Siemens MS40.1 # 1 12 14 1 429 440
    5WK9 003/1

    Please tell me that I only need to put in some Gas!!!

    Joe
    Since we cannot do it alone, we need each other.

  2. #2
    Join Date
    Feb 2004
    Posts
    4,894

    Default

    If you haven't changed the crank position sensor... this is what I would do first. Buy only OE crank position sensor.

  3. #3
    Join Date
    Mar 2008
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    Default

    Thanks,
    I'll have that done.
    Since we cannot do it alone, we need each other.

  4. #4
    Join Date
    May 2004
    Location
    Japan
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    9,249

    Default

    My Indie tells me that sometimes the scanner looses connection with the DME
    depends on his scanner. Probably he does not have a original BMW diagnosis system. I just got a GT1 scanner for BMW cars from a chinese seller, also this one sometimes does not communicate with the car, then I try various ways to overcome that, yesterday for example I had the scanner connected to the diagnosis port, no communication, then I left it connected and switched several times the ignition key back to off, acc and on, and suddenly it communicated again with the system.
    Still playing with that tool to learn, so I could make a test simulation of the wiper pressure motor, central locking, IHKA testing, engine codes etc.

  5. #5
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    Mar 2008
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    Default

    Thanks for that.
    I'll pass it on.
    Gives me hope for the DME
    Since we cannot do it alone, we need each other.

  6. #6
    Join Date
    Dec 2004
    Location
    Sydney, Australia
    Posts
    4,374

    Default

    x2 for the CPS.

    Other things may be:

    Bad transmission (if auto). The Transmission computer talks to the ECU and can cause strange results in addition to a bad battery. Verify the battery is not too old, they can become start to intermittently drop voltage which can upset ECUs and cause all kind of codes/ errors.

    If so, the car won't start one morning. Replacing it with a known good one can solve all kind of annoyances...

    Join the Aussie
    540i LE yahoo forum

    08/88 535i e34 M30+miller MAF, 'stiens, tints & teeth!

  7. #7
    Join Date
    Mar 2008
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    Default

    Hmmm

    It is Auto but the problem remains in "Park".

    There are no codes showing up.
    Since we cannot do it alone, we need each other.

  8. #8
    Join Date
    May 2004
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    Japan
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    Default

    Did you already check the bowden cable from the shift stick to the automatic transmission. Maybe it slipped?
    Here you can see what I mean, that is an E32 740, but same tech details
    E32 Selector Shaft Seal Replacement
    Also clean the switch page_2
    do you see all the gears in the cluster check control?

    For used parts you might ask in the U.K. forum
    The 7 Series Register Homepage
    that is mainly for the 7-series, but some people also have E34.

  9. #9
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    Mar 2008
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    Default

    Thanks,
    I did not mean the Trans is stuck in park.
    I mean the power problem is there when the Trans is in park. The Trans is working just fine.
    Since we cannot do it alone, we need each other.

  10. #10
    Join Date
    Mar 2008
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    Default

    Update:
    First a recap.
    When the transmission is in neutral, (park) and you apply a rapid increase in throttle, the engine “bogs down” and really misbehaves.
    If you apply small and increasing throttle, the engine will accelerate.
    If you put it in drive and try to move off, it just “bogs down” and goes nowhere.
    It will stall if you persist.
    It will restart right away.

    My mechanic, Kennard, and I have put our combined heads together (that includes you) and we are moving forward.

    We have checked the Air Flow Sensor.
    Tried two new ones.
    Even tried mine on another car.
    We have checked the TPS with meter and scanner. It’s fine.
    We have changed the Cam Sensor. Fault Code gone.
    The fuel pressure is fine.
    The fuel pressure regulator is working.
    The backpressure is fine.
    The Transmission is fine.
    The injectors are working fine and show normal response on the scanner.
    The O2 sensor was checked. (Not that this would cause such a big problem.)

    There is one thing we are concerned about.
    The ignition timing is not responding the way it should when you attempt to accelerate or increase the RPM and is inconsistent. (Kennard’s words)
    NO CODES!
    The Crankshaft Sensor is next.
    Of note is that the tachometer is working as normal with no erratic behavior.
    We have a Crankshaft Sensor standing by and will be checking the CRANK sensor with an oscilloscope on Monday.
    As a last resort, we have a DME standing by.

    Now for something to keep you all interested.
    Like so many E34’s, I have a battery drain.
    To save the battery, I have installed a relay to disconnect the battery.
    I’ve killed several (expensive) batteries.
    I use this when I will not be using the car for more than a few days.
    You know that there is a “learning” process that the Computer goes through to adapt to your style of driving.
    My understanding is that this is more to do with the transmission.
    Kennard is a little concerned that the frequent disconnection of the battery and resetting of the computers might be causing a problem.
    Any thoughts?

    I will update as time permits.
    Joe
    Last edited by JoeGons; 02-09-2013 at 07:32 PM. Reason: Added a point.
    Since we cannot do it alone, we need each other.

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