2003 E46 320i, Opinions Please(Cold start misfire) - Page 5

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  1.  
    #41
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    hontoir's Car Details
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    Well I have now moved house and the issue is the same.

    Advise from another forum suggests that it may be a fuel injector and DD has suggested the MAF. Will an independent BMW garage be able to tell me what exactly is causing the problem?
    2003 E46 320Ci Coupe
     
     

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  3.  
    #42
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    you are running slightly rich but its within ECU parameters they usually run mulitplactive at +1-2%

    i think you may have an iffy MAF or restricted airflow (blocked air filter) lookin at your stats you dont have vacuum leaks..but highly doubt that would cause a missfire tho..

    are your lambda's crosscounting???

    and can you post up ya INPA rough running GUI..?

    ya may need to do a few miles mixed driving before getting a true multiplactive adaptions represention tho..


    missfire diagnosing rule of thumb and rule it in or out= swap the coilpack,sparkplug and injector for a known good cylinder..

    always clear trouble codes between any engine work or changes before going for a run..
    330i sport a big chunk of berlin...

     
     

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    #43
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    Sorry I am unable to help with your issue, can you send me the link of the cable you bought? Are you using INPA in Windows 7 over USB?
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    #44
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    Update is that I dropped off the car at APM Motors yesterday, and they have not had any of the cold start problems, although it was stored indoors last night which mine never is.

    DD
    The air filter is new, although yes it MAY be the MAF so I will clean that if/when I get the car back.

    I think it is going to be the injector, however, without having the car I cannot swap it for a different cylinder. Is this procedure hard?

    Yes following all work carried out I clear the error memory and adaptations and give it a good run.

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    2003 E46 320Ci Coupe
     
     

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    #45
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    UPDATE

    MAF was cleaned yesterday and the adaptations cleared. Same problem today, vibration until idle lowers.

    However, revving the engine after this resulted in the idle dropping down to 500 and then picking back upto 700. Any ideas?

    Could these symptoms be caused by the ICV? Or maybe the DISA?
    2003 E46 320Ci Coupe
     
     

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    #46
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    Well I have cleaned the ICV and the DISA, nothing different. Again the idle seems to drop and have to pick up again.
    2003 E46 320Ci Coupe
     
     

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    #47
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    Quote Originally Posted by hontoir View Post
    Update:

    Started her last night as normal, again first start of the day, so started missing and then went away. Stopped outside a friends house and there was some smoke coming out of the exhaust (not a huge amount).

    Started her this morning with the MAF disconnected, seemed to start better (so is this sign of a vacuum leak?) I then checked the rough settings and cylinder 1 was rougher than the others, reconnected the MAF and this dropped straight back down.

    Also judging by the plugs and the smell she is running slightly rich (again maybe a vacuum leak?)

    Here are the fuel settings, not sure what any of this means though.
    vacuum leaks cause lean running conditions not rich running....and it is running slightly rich LTFT is currently -3-4% mine runs at +1-2% constant but it depends a lot on your driving and where your doin it...
    330i sport a big chunk of berlin...

     
     

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    #48
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    Managed to live with the problem for a while, however, with the emissions light flickering on and off daily like a Christmas tree I was getting fed up.

    It had been suggested that it could either be the MAF, HVAs or an Injector.

    So far coils have been swapped out, spark plugs have been swapped out, new rocker gasket fitted. Wynns hydraulic valve cleaner added. Some fuel injection system cleaner has been added. I am only running the car on Vpower. MAF has been cleaned and car tested with MAF unplugged.

    My thinking is that, the MAF should/would cause problems with all cylinders rather than just the one.

    A fuel injector might be leaking, which when left cold or for any long period the fuel drips into the cylinder creating a too rich mixture upon initial startup.

    A HVA might be failing/failed, in which case the valve is not opening/closing correctly resulting in poor compression.

    So today I swapped out two fuel injectors, prior to this cylinder 5 had a misfire and for the first time in a while cylinder 2. So I swapped 4 and 5. Will wait til tomorrow morning to see if the problem migrates.
    2003 E46 320Ci Coupe
     
     

  10.  
    #49
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    Problem stayed with cylinder 5.

    Got a compression test done today:

    COLD (6) 215 (5) 215 (4) 212 (3) 210 (2) 210 (1) 200

    HOT (6) 180 (5) 180 (4) 180 (3) 178 (2) 175 (1) 180

    So that seems pretty even. However, the garage managed to find an error logged:
    DSC Canbus error to DME
    Garage reset this and all ok.

    Will test in the morning, although I do not expect it to be this.

    So any ideas anyone? Slowly running out of options.
    2003 E46 320Ci Coupe
     
     

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    #50
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    have we tried swapping an injector yet??

    compression is good so it can only be plug or injector related or an iffy port manifold gasket i would of thought...a dodgy o ring or seal on an injector can give an emmissions mixture problem although it would be a lean problem...
    330i sport a big chunk of berlin...

     
     

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