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Thread: Help with error code and engine shaking

  1. #1
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    Help with error code and engine shaking

    Hello,

    I need help with my 2000 735i.
    I in the process of replacing both cat converters soon, and a few days ago, in the morning when starting the engine, idle went rough, and CEL flashed.
    Engine shake while driving, and it was a pain to drive.
    I managed to clear the codes, but they came back soon and so did the shaking and loss of power.

    Screenshot_2018-07-16-18-43-22-337_org.prowl.torque.jpg

    All 8 ignition coils are brand new (Bremi) and spark plugs replaced 6 months ago.
    I did replace the valve cover gaskets 6 months ago.

    My question is, could it be related to clogged cat or is it something different like a vacuum leak on the intake?
    It's driving me nuts, and the car is a pain to drive...

    Thank a LOT for your help.

    My question
    Last edited by Shnalla; 07-19-2018 at 09:22 AM.

  2. #2
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    Have a read of this and see if your problem in any way matches it:

    https://www.meeknet.co.uk/e31/E31_84...l_Throttle.htm
    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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  3. #3
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    Hi Timm,

    Thanks for your reply.
    Actually your tutorial was the first thing I checked when it happened!

    I'm not sure that my problem matches what you describe.
    Engine shake on idle or at high rpms, only throw a code from one cylinder instead of a bank.

  4. #4
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    If it is only a slight vibration and only when you put throttle on when cruising then I would believe what diagnostics are telling you and that the injector on cylinder 5 is not doing anything. They can go open-circuit. Diagnostics would find it as a zero value for cylinder 5 on the smoothness page....
    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 BMW Repair YouTube Channel
    My Current 840ci Sport Individual
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  5. #5
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    Actually it's a pretty strong vibration.
    I can feel it and hear the engine misfiring and/or running on 7 cylinders...

    The weird thing is that it randomly appears and and disappears.
    Though when oil is fully warmed up, it's shaking all the time.

  6. #6
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    Swap coil and sparkplug to opposite bank to verify.

  7. #7
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    The car had what I believe to be original coils when the problem appeared.
    I've replaced all 8 coils right after.

    I'will do the test anyway.

  8. #8
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    It seems cylinder #5 specifically is the cause of your problem,
    so I would focus on the injector, electrical connection, wiring harness,
    and finally DME which contains the injector driver.
    Timm would be more familiar with this,
    as I have never personally opened up an e38 DME/ECU

  9. #9
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    We have 5 BMW's (Cars)
    Since the code specifically says Injector circuit. I'd look at the injector plug, then the injector itself.

    Sent from my SM-G955U using Tapatalk
    1 E38, 1 E39, 2 E46's, 1 E65, 1 R22, 1 R75/5

  10. #10
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    Yeah, that makes sens.
    I will take a look today.
    I have replaced valve cover gaskets 6 mouths ago, maybe I missed something when reinstalling the box, and injector plug is not held correctly ...?

  11. #11
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    Ok, so I did a visual check, and the main connector to the driver side black box looks strange.
    The green grommet was visible and out of its place.
    I carefully plugged in the connector without pinching the grommet, fired up the engine, and voilą, smooth as it used to be!

  12. #12
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    Glad it was something simple

    Sent from my SM-G955U using Tapatalk
    1 E38, 1 E39, 2 E46's, 1 E65, 1 R22, 1 R75/5

  13. #13
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    So I'm assuming that was your injector harness.

  14. #14
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    Thanks for you help!
    I have to admit that it was a stupid problem

  15. #15
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    Glad it was an easy fix.

  16. #16
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    Quote Originally Posted by Shnalla View Post
    Thanks for you help!
    I have to admit that it was a stupid problem
    You must be "blessed". Why can't I find a simple problem with a simple fix. Some people have all the Luck. Congratulations.

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