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BMW F11 - Scary experience with smoke from engine compartment

  • 12-10-2024 04:49PM
    #1
    Ardent
    Registered Users, Registered Users 2 Posts: 5,374 ✭✭✭


    Had a scary moment with my 520D Touring today, having just pulled into my driveway after a short journey.

    All of a sudden, there was smoke in the cabin and I immediately evacuated the family. There was a crazy amount of smoke coming from the front of the car and I expected to see a fire when I lifted the bonnet.

    Recorded a video of what I saw:

    https://youtu.be/Pssn3fG25pQ

    Does anyone know what the hell might have happened here?

    Even though you can see a leak in the engine compartment, it didn't smell like burning oil.

    One thing I didn't notice at the time, but you can see it in the recording, is that the smoke wasn't continuous - it came in waves.



Comments

  • #2
    sundodger5
    Registered Users, Registered Users 2 Posts: 1,248 ✭✭✭sundodger5


    coolant leak?



  • #3
    Ardent
    Registered Users, Registered Users 2 Posts: 5,374 ✭✭✭Ardent


    Two pieces of info that might be related -

    1 - This car has been into the BMW dealership twice as part of the EGR cooler recall a couple of years ago.

    2 - Just yesterday I was reading fault codes from the car - due to a check engine light - and it looks like I need a new exhaust gas pressure sensor.

    These are the codes I found:

    258700 Exhaust gas pressure sensor, diesel particulate filter, signal: Too low

    290900 Air mass system: Measured air mass too high (Exhaust gas pressure sensor before turbine faulty (in conjunction with the fault codes 27B900 and/or 4C83 and/or 28DE00 and/or 4990).


    28DE00 Exhaust backpressure sensor before turbocharger, signal: Dynamics implausible

    2C2200 Coolant temperature sensor upstream of low temperature EGR cooler, coolant
    temperature, signals: implausible with each other



  • #4
    mk7r
    Registered Users, Registered Users 2 Posts: 1,060 ✭✭✭mk7r


    Egr cooler failure? Was it steam or smoke



  • #5
    Ardent
    Registered Users, Registered Users 2 Posts: 5,374 ✭✭✭Ardent


    It was smoke with that burning plastic smell.



  • #6
    PukkaStukka
    Registered Users, Registered Users 2 Posts: 2,291 ✭✭✭PukkaStukka


    Have you breakdown assist on your insurance policy? If so, call them out to check it



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  • #7
    Gussie Scrotch
    Registered Users, Registered Users 2 Posts: 1,080 ✭✭✭Gussie Scrotch


    https://www.boards.ie/discussion/comment/122712463#Comment_122712463

    Not a mechanic, but I have had a similar problem with my 520 d.

    My guess….intake manifold problem.



  • #8
    freddieot
    Registered Users, Registered Users 2 Posts: 1,163 ✭✭✭freddieot


    When I had the EGR replaced on an X5 the mechanic found a small hole burned in a boost pipe. It had to be replaced as well.

    I never noticed smoke but there was a definite smell in the cabin.



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