[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

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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 Wearing official underwear

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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

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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

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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

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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 Rocking a new hat

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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.
     
  13. 21 Feb 2020 at 1:26 PM #53
    azriz

    azriz A mere Chipper

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  14. 21 Feb 2020 at 8:47 PM #54
    Assimilator1

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    Yeah, would like to know too! :)
     
  15. 1 Aug 2020 at 9:26 PM #55
    rawbhp

    rawbhp On the path

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    Just thought I’d update this with my experience in case it saves someone stress and money.

    I had multiple misfire codes and the engine would go into limp mode on most journeys. Changed the spark plugs, no change (except for smoother running).

    Eventually read that it can be caused by leaking seals between the downlpipe and primary cat. I’d also noticed a louder exhaust noise and fumes when idling in traffic.

    Ordered a seal kit from BMW including nuts and bolts which are supposed to be replaced every time you change the seals.

    Got them fitted and no issues since! Runs smoother and the noise and fumes are gone plus no error codes. Much cheaper and simpler than coil packs etc...
     
  16. 3 Aug 2020 at 1:16 PM #56
    Assimilator1

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    Yea if you get symptoms like that, noise and fumes (I don't think the op did, IIRC), I would have thought they'd also be some error codes relating to mixture. Didn't you have any?
    Btw multiple misfires can be caused by any number of things going wrong.
     
  17. 3 Aug 2020 at 1:23 PM #57
    rawbhp

    rawbhp On the path

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    Makes sense. My codes were just misfire related. Perhaps a smaller leak wouldn't be that obvious in terms of noise and fumes but could still throw the codes. Worth bearing in mind as I nearly went down the route of much more expensive coil pack swaps etc...
     
  18. 6 Aug 2020 at 1:16 PM #58
    Assimilator1

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    Yea true, the best time to listen to exhaust manifold leaks (if minor or just suspected) are when the engine's cold and before it's all expanded, that can often stop the noise itself, in the short to medium term anyway.
     
  19. 9 Aug 2020 at 10:29 PM #59
    Harryc9

    Harryc9 A mere Chipper

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    Been an interesting read so far!
    I test drove a car on Saturday that’s really nice except when I pulled over to let my dad drive the car, at idle the car went into limp mode citing multiple misfires (happened again 20 minutes later too). The car was already at operating temperature when this happened.
    I know the stock exhaust was recently refitted and couldn’t hear any leaks.
    Anyway, any updates from the thread starter? Would be good to be armed with a good technical understanding before they try to con me into thinking it’s all sorted.
    Cheers
     
  20. 14 Aug 2020 at 7:18 AM #60
    Assimilator1

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    As I said earlier, multiple misfires could be caused by multiple different issues, that car's problems aren't necessarily the same as the ops.
    For starters you need to plug in a code reader to see what fault codes their are, or better still, tell the owner to fix it or walk away from it.
     

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