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  1. #281
    TJ
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    DME fault being thrown?

    I'm the new owner of a 2000 528 and my "service engine soon" light just came on. The shop reported the DME fault being due to "Vanos exhaust camshaft blocked/stiff". I haven't experienced any of the commonly reporting idle/stall issues and I've been in 0-15 degree temps for the last several weeks. Just wondering if this sounds like the same type of problem.


  2. #282
    chris
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    Pleaseeeee kill this thread!

    or make it shorter!

  3. #283
    OldGuy
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    Yeah, if we keep replying maybe it will go away!


  4. #284
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    Re: DME fault being thrown?

    From our findings we expect the exhaust side vanos piston to have the most trouble with the O-rings failure. There is a spring behind the exhaust piton that advances it by default. It takes a good deal of pressure to overcome this spring. When the O-rings fail causing the oil seal to leak we expect the DME will not be able to overcome the leak and build the needed pressure to overcome the spring and reposition the exhaust piston. Thus the DME will find that it can’t reposition the camshaft. This might be represented as “vanos exhaust camshaft blocked/stiff”.

    I don’t know what code you have. What OBDII or BMW code # is this? I don’t see this definition on any of the lists I have available.
    What code reader is your mechanic using??
    Usually there is no associated service engine soon light or OBDII code. The usual obvious symptom is the cold weather problem.
    Let your engine warm up completely before starting to drive and see if you get the usual idle oscillations symptom.
    Rajaie
    528i 5sp 06/00

  5. #285
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    Change your display settings


    I surely can sympathize with you. This thread is humongous. But this is an important ongoing topic and people still appropriately want to discuss it. It is very useful to have all this discussion gathered in one location. In some ways this discussion is more important than the endless repetition of most topics that are posted daily. One just wishes this thread wasn’t so loooong.

    It would be great if we found a way to transplant this thread so it's not always in the way. I don't have any ideas. I can write Charlie, but I haven’t had good luck getting responses in the past. I’m sure they’re busy.

    All I can suggest for now is for you to set your RF preference “Thread sorting:” to “Descending date order”. This will display the threads is newest initial post chronological order. I find this to be the only sane way to view the forum. Otherwise the threads are always jumping around in their display order. Unfortunately with this setting you might miss any updates to older threads. But then this might be very well what you’re looking for.

    Thanks for understanding.
    Rajaie
    528i 5sp 06/00

  6. #286
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    Thank you for such an insightful understand of

    the situation.

    though i don't have vanos (98 540), i understand the fustration.

  7. #287
    TJ
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    Re: DME fault being thrown? P1523?

    Minor update. I just picked up a code scanner to check this out. The only DTC reported was P1523. I've found a couple of definitions for this code but the best one seems to be "'A' Camshaft Position Actuator Signal Low Bank 1". Any thoughts on whether this merits a Vanos replacement? I've gone ahead and cleared the code and will be interested to see how quickly it comes back.

  8. #288
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    Re: DME fault being thrown? P1523?


    OBDII code P1523 for your car (same as mine) translates to BMW code 106 (hex 6A). The Peake code reader manual (table 15) defines this as “VANOS, exhaust mechanically stuck”. The Bentley manual states “’A’ Camshaft Position Actuator Signal Low (Bank 1) (M52: ‘B’ Camshaft Position Actuator Tight or Jammed)”. The definition in the parenthesis, I believe, is the correct description. That is, the vanos exhaust piston (actuator) can’t be positioned (moved).

    As I’ve explained before the exhaust piston will be the first to fail due to the spring opposing it. Thus it seems quite reasonable that a fault code is generated to denote this situation. What’s strange is that you’re the first case we’ve heard of to have this code. Further, you also don’t have the cold weather symptoms.

    Maybe when the code was generated the DME decided to stop utilizing the vanos. Thus it will not engage it in the cold weather state and subsequently you don’t have the associated cold idle symptoms. Maybe after you reset the fault codes you’ll start seeing the cold weather idle oscillations.

    This sure sounds like the vanos problem, but since we haven’t seen this code before, I can’t be sure.
    You can either replace your vanos with a BMW rebuilt one, or wait till we come out with the seals solution and install that.
    If you decide to replace the vanos, I’d be interested in purchasing your old one. You can contact me privately by email (above, blue name).
    Rajaie
    528i 5sp 06/00

  9. #289
    TJ
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    Re: DME fault being thrown? P1523?

    Thanks for the thoughts. I'll let you know how things go from here. It's only been a couple of days, but the "check engine" light hasn't come back on. This is all still very new to me, so I'm not sure what to expect. One thing I can say is that if I don't need to drop $1000 into a replacement, I won't.

  10. #290
    TJ
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    DME fault not back (yet)

    It's been about a month since changing my oil and resetting the check engine light. It hasn't come back, so I'm hoping for the best. Seems like an oil problem could have been related to this.

  11. #291
    AG
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    Re: 6-cyl double vanos problem assessment

    I have a 99 528i 5-speed and have the cold idle problem...

  12. #292
    Ronin
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    Re: Rajaie new seals

    I just purchased an '03 330i w/16k miles. It is showing similar symptoms (car at the dealership ATM). The point is failure may be time dependent and not miles based, which supports a seal problem IMO. A car w/16k miles most definitely shouldn't have this significant of a failure. Now a 4 y/o car...maybe a little more realistic.

  13. #293
    Sniffer
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    Re: Yeah, if we keep replying maybe it will go awa

    Any news on the repair kits yet???

  14. #294
    adam
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    Re: Don't some I6 engines have 2 Cats??

    European and UK M52TU Double Vanos cars have twin cats under the car.
    It wasn't until the M54 that the cats moved to the manifold.



    adam

  15. #295
    adam
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    Re: 6-cyl double vanos problem assessment

    How come my 1999 M52TU has reached 135k without problems ?
    It's never had a DME update.I know of cars with over 200k here in England on the original VANOS units.That's not to say the seals don't
    wear clearly every thing does over time.

    adam

  16. #296
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    Re: 6-cyl double vanos problem assessment


    Thanks for the info Adam.

    It might very well be that European M52TU autos are not experiencing the vanos cold weather cold engine idle problems. It’s not difficult to speculate on the reason.

    As described in the original post the idling problem is caused by the DME software. If the European M52TUs are not having the problem then they likely have different software. The vanos idle problem occurs when the DME is manipulating the vanos to help heat up the catalytic converters. Maybe this feature is not enabled in the European software rev.

    But this doesn’t mean the vanos is not failing. I’ve now inspected several vanoses and they are all failing in the same manner. The seal O-rings are badly deteriorating. I recently removed my 2 year (20k miles) old vanos from my car. I can rotate the vanos and shake it a bit and have the intake piston slide from cylinder end to end. This is a clear indication of deteriorating piston seals (O-rings).

    The seals solution kit will be available soon and owners will provide feedback on their experience. I’m sure we’ll hear much about the state of these O-rings. All cars with this vanos are having a vanos failure.

    Thanks again for your input.
    Rajaie
    528i 5sp 06/00

  17. #297
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    Re: Yeah, if we keep replying maybe it will go awa


    I'll be installing the new seals solution in my car next week, so you'll be hearing some news soon.

    Sorry for the long delay.
    Rajaie
    528i 5sp 06/00

  18. #298
    dmako
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    Perhaps just in time for cooler fall weather?


  19. #299
    adam
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    Re: 6-cyl double vanos problem assessment

    You could try having a look at the German BMW forums (through google translator) , it gets very cold in eastern Germany.
    BTW Euro spec M52TU E39's have the cats under the car not the manifold.
    That only came in with the M54.
    The only other difference I can think of would be gas quality.In the UK regular is 95 octane but most people with performance cars run super at 98/99 octane.
    looking through the UK forums only M3 cars have regular VANOS problems.
    If there where widespread M52TU VANOS problems I'm sure the specialists would be offering rebuild kits by now.
    My own car is certainly not down on power I've timed it slightly quicker
    than the fiqures in the handbook.

    adam

  20. #300
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    Adam, send me an email

    Rajaie
    528i 5sp 06/00

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