[E90 / E92 / E93] M3 - Intermittent misfiring on multiple cylinders

Discussion in 'Faults, Fixes and Solutions' started by M3Richard, Mar 30, 2019.

  1. 12 Jan 2020 at 7:41 PM #41
    bav1973

    bav1973 On the path

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    Hi mate, you can take a look at my thread if it helps as I’ve had the same issue:

    https://forums.m3cutters.co.uk/thre...s-on-all-cylinders.214361/page-2#post-2839496

    I had lots of replacement parts, duff o2 sensor, fuel cap, leaky injectors (one replaced, plus all seals on others), new plugs, terraclean (decarbon). The single biggest thing to influence it was the change of coil packs. I was lucky enough to be able to swap some parts around and rule out ecu issues. I even had boroscope checks on the cylinders etc.

    If you haven’t changed all of your coil packs it’s worth considering but expensive even from Cotswold bmw.

    I have seen broken valve springs mentioned before but if I remember rightly my mechanic thought it would be more regular an occurrence than I was experiencing.

    Good luck, I hope you sort it out!
     
  2. 13 Jan 2020 at 9:57 PM #42
    Assimilator1

    Assimilator1 A mere Chipper

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    He's already mentioned that he's had new coil packs ;) (or at least 1 on the problem cylinder anyway).
     
  3. 13 Jan 2020 at 10:05 PM #43
    LaurenceT

    LaurenceT On the path

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    Have you checked voltage from alternator? Watched a video on youtube this evening where a failing alternator caused erroneous dyno results when fitting test pipes, may be worth eliminating from the various other parts checked.
     
  4. 13 Jan 2020 at 11:45 PM #44
    Assimilator1

    Assimilator1 A mere Chipper

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    That would affect multiple cylinders, not just one, and possibly other things too.
     
  5. 14 Jan 2020 at 12:32 AM #45
    GolfDuck

    GolfDuck Staff Member Moderator

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    Without wishing to muddle things cylinder no 6 is the second from the front on the right bank when looking from the front of the car. That's the one you're swapping things on. Right?
    BMW changed the numbering system on V8's some time ago iirc.
     
    Last edited: Jan 14, 2020
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  6. 14 Jan 2020 at 8:34 AM #46
    GolfDuck

    GolfDuck Staff Member Moderator

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  7. 14 Jan 2020 at 4:05 PM #47
    bav1973

    bav1973 On the path

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    Yeap, I know that mate. My mechanic thought it was Cylinder seven on my car failing and I had that injector replaced (I also had multiple cylinders reporting misfiring).

    It was only after replacing all of the coil packs that the car started to behave itself but a number of other parts were found to be faulty and swapped out too.

    We did have the benefit of spare parts to test this with luckily. I wasn't really happy with the 'I think its probably this approach' and then to have to spend lots of cash finding that it wasn't.
     
  8. 14 Jan 2020 at 6:38 PM #48
    Assimilator1

    Assimilator1 A mere Chipper

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    Yea that sucks he wasted your money, I'm a mechanic myself, for a multiple cylinder misfire problem I wouldn't just randomly try buying new parts. If it's a random multiple cylinder misfire then I'd be looking at what parts would affect that whole bank, if it's consistently 2 or more particular cylinders I would likely try swapping parts, e.g if 2 & 6 were misfiring I'd swap 2 & 6 plugs & coils for another 2 cyls & see if the misfire codes move with them.

    But anyway, you're missing the point that the op's problem is no longer a multiple cylinder misfire, the new DME sorted that out, but he was/is left with a misfire on cylinder 6 only. And that cylinder has had a new coil, spark plug & injector(!).

    Talking of the op, where's he gone?? ;), hello M3Richard?
     
  9. 14 Jan 2020 at 6:50 PM #49
    bav1973

    bav1973 On the path

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    Ah, gotcha buddy! Mine was misfiring across all 8 cylinders at times and was random so even switching the odd coil pack wasn't helpful.

    I hadn't realised that the op has only got a misfire on the one cylinder.

    Perhaps he's gone off to make a bonfire with his car..I spent a ton of cash and was massively hacked off with my car when it was happening.
     
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  10. 14 Jan 2020 at 7:12 PM #50
    Mpower7

    Mpower7 Wearing official robes

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    The only time I had this kind of fault on this model I had to swap a complete engine wiring harness over to test and this cured the issue. From memory it was not an issue detected on the wiring to that direct cylinder but more so an earthing problem on the main harness between the V.
    The car in mention would randomly misfire on cylinder 3. Every other possibility was ruled out by swapping components to other cylinders, compressions and cylinder leakage test results were in spec.
    The car has been fine since.
     
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  11. 14 Jan 2020 at 9:56 PM #51
    M3Richard

    M3Richard A mere Chipper

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    The thought has crossed my mind on multiple occasions!


    Apologies for the lack of response, I've just not had time to look any further at the car!
    I would be very doubtful that the mechanic has changed the parts on the incorrect cylinder. I'd also be very reluctant to ask him to have a look at this over again, as I'm sure you'd agree it would be a little insulting? Maybe just me.
    I'll hopefully have something to update with soon enough.
     
  12. 15 Jan 2020 at 9:24 PM #52
    Assimilator1

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    Yea I see it would be awkward to ask that!

    I don't recall how easy they are to see, but couldn't you take the cover off to see where the new coil & injector are?
    Otherwise, it's time to check the wiring & connectors for that cylinder's coil.
     

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