Question about 2001 BMW 5 Series

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BMW 523i 1999 model

Have an intermitent missfire on No 3 and 4 cylinders. If I idle at 500rpm for three mins then I get a missfire in No 3 & 4 cylinders. I have changed the cils and plugs but the misfire is still there. To clear the misfire I travell for about ten minutes and the problem goes away. If I keep the rpm above 980 then there is never a missfire. What is the problem? BMW South Africa want to strip the engine but I can not afford to do this. Please can you help?

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  • david_newman May 29, 2009

    Many thanks for the feed back, I will look at the car RPM this weekend and do the suggested tests that you reccomend. I will give feed back at a later date.

    Many, many thanks.

    Dave

  • Steve Hurc
    Steve Hurc May 11, 2010

    check idle speed & adjust seems a bit low.



    ive seen this problem and its been water leaking into cylinder/s afecting it when cold and missfiring some times continuing when warn intermitantly(more at lower revs).

    get cooling system checked when hot, running with T.K.(head gasket leak detector)and by pessure testing cooling system when hot then check for water in cylinders or on plugs to confirm head gasket leaking.

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Your car is not suppose to idle at 500 rpm . 800 to 950 is the proper idle, unfortunately it is controlled by the computer. have you checked the idle speed control valve? also check the air flow meter

Posted on May 28, 2009

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