Mid range hesitation/misfire 2004 955i
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  1. #1
    Noob! Kevin4.p's Avatar
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    Mid range hesitation/misfire 2004 955i

    Hi Everyone,
    I have a 2004 955i with 26k on the clock.
    Valve clearances were completed at 18000 miles by the previous owner.
    I have an issue in low speed corners or in town.
    The pick up can sometimes hesitate with a sort of misfire and the bike judders almost as if its in too high a gear. I'm wise to this now and keep it in a lower gear anyway but dropping down raises the revs and clears this.
    It's an intermittent fault as sometimes the bike will pull like a train and sometimes does this.
    Anyone have any pointers as to where to start?
    I have thought about fuel filter, plugs etc. and even the battery as my Sprint had a misfire caused by a faulty battery.
    Thanks in advance.

  2. #2
    Noob! Daygan's Avatar
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    I have a 04 too,I have a aftermarket can on mine,like yours it had a slight hesitation,so I took it to the local bike shop, and they had a look at the ECU and it had a very old setting in it,and for the standard can,so I it got reprogrammed and it's great now,The mechanic said it was the timing being affected,might be worth checking your ECU.
    I do get a bit of a pop just occasionally but that's when I'm off the revs after a fast blat,I like that,i'm certainly not the only one
    hope this may help. Good luck with it

  3. #3
    Noob! Kevin4.p's Avatar
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    Cheers mate, I'll look into that. I do love the popping sound tho! :-)

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    The "Friends" of Officer Frank Poncherello dr_gallup's Avatar
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    My 06 had a low speed part throttle miss that I fixed with a new coil.

  6. #5
    Noob! Kevin4.p's Avatar
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    I had thought about a coil, theres one on each plug on mine, not sure how to test as its an intermittent fault.

  7. #6
    The "Friends" of Officer Frank Poncherello dr_gallup's Avatar
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    Very hard to test, we just happened to have a custom built coil tester at work. The good ones put out about 25,000 volts, the weak one 17,000. Don't have access to that piece of gear anymore, it's in Poland. About all you can do is get a known good coil and swap it out cylinder by cylinder.

  8. #7
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    The "Friends" of Officer Frank Poncherello AA's Avatar
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    Quote Originally Posted by Kevin4.p View Post
    I had thought about a coil, theres one on each plug on mine, not sure how to test as its an intermittent fault.
    Same, same.
    Run the bike in the crap range, temp test the headers.
    Swap coils around, run in crap range, retest temp of headers.
    Repeat until you find the crap coil(if that is the problem).
    The cylinder with the buggered coil should run cooler and should move as you move the coil.
    I think this should work if it is a coil problem.
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    Crack a tube.

  9. #8
    Noob! Kevin4.p's Avatar
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    Thanks everyone. I have a few things to think about here. I have also been told it may be the TPS. All good fun.

 

 

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