1999 E46 323i se saloon misfiring problem on cylinders 1, 2 and 3

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  1. 1999 E46 323i se saloon misfiring problem on cylinders 1, 2 and 3 
    #1
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    ianbmw's Car Details
    Model of Car:
    323i se
    Year of Manufacture:
    1999
    Transmission Type:
    manual
    Car Body Type:
    saloon

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    Hi,
    new to forum and looking for HELP!!!!
    My son recently bought an E46 1999 T reg 323i se saloon.
    It more or less immediately developed a misfiring problem which at first my local mechanic thought was happening on one cylinder and checked the usual coil packs etc with no success.

    I had an auto electrician check out the car today and he tells me that in fact cylinders 1, 2 and 3 are all misfiring intermmitently and at various times either one can be worse than the other two. He thinks it is not electrical but I'm convinced it is.

    Sometimes when driving the car when not running properly if you turn a sharp corner or go round a roundabout it immediately starts running perfectly on all 6 cylinders again as if something is moving ie maybe a bad conection or something but at any point can start to run like a dog again.

    Seems to be something linked to cylinders 1, 2 and 3 as 4, 5 and 6 are perfect. New spark plugs fitted today too!!

    Sparky thinks it may be the manifold as there is a seperate one for the first 3 cylinders from the 2nd 3 cylinders but I think if that were the case then the fault would be there permanently and not intermitent.

    Anyone had this problem or any ideas or does anyone know if there is possibly a module, sensor etc that controls the first 3 cylinders separate from the other three.

    I've had loads of 6 cylinder e36 and e46 models over the years but never experienced anything like this. My son's first BMW and as you can imagine totally depressed with it so far

    Thanks

    Ian
     
     

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    #2
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    steve23002's Car Details
    Model of Car:
    530i Sport
    Year of Manufacture:
    2002
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    Have you had the fault codes read yet?
    I would also be checking all the vacuum pipes under the bonnet for any splits or cracks or perishing. Its always worth checking for air leaks on these engines...
     
     

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    Faulty MAF can brig about these problems as well.
     
     

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  6. E46 323i missfire 
    #4
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    ianbmw's Car Details
    Model of Car:
    323i se
    Year of Manufacture:
    1999
    Transmission Type:
    manual
    Car Body Type:
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    Thanks guys, I will get him to check this out...
    Is there 2 separate inlet manifolds for cylinders 1,2,3 and 4,5,6?

    cheers

    Ian
     
     

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    Quote Originally Posted by ianbmw View Post
    Thanks guys, I will get him to check this out...
    Is there 2 separate inlet manifolds for cylinders 1,2,3 and 4,5,6?

    cheers

    Ian
    Airflow is shared using the resonance valve. Is that what you mean?
     
     

  8.  
    #6
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    louis73's Car Details
    Model of Car:
    523i se
    Year of Manufacture:
    2000
    Transmission Type:
    automatic
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    try the cam sensor try inlet first i had intermittent probs with my 523i changed the sensor ,cant believe the difference..good luck
     
     

  9. missfire 
    #7
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    steve.branton1959's Car Details
    Model of Car:
    m3 e36
    Year of Manufacture:
    1995
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    check the wiring loom for the injectors somtimes you get a break in them.best way it to get a second hand one and try it i repair bmw,s and this is quite common.steve
     
     

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