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Soft misfire !
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- Senior Member
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Soft misfire !
Hello all,
So - 35i - 42k miles - FSH - Full tank of momentum - 6 new BMW injectors 2000 miles ago.
I filled the car up this afternoon and my route home was via a fast (70mph) stretch of dual carriageway.
The slip road is a hard right loop followed by a left 'tweak' as you join the carriageway.
As I negotiated the right loop i put the DCT into sport (not the engine) and accelarated at around 85% throttle.
For a second I thought the rear tyres had lost grip (nothing new car is running a stage 2 MHD map with a fully mapped DCT) but then I realised that I had momentarily lost some - not all - power!
It was not a hard juddering misfire like an electrical failure or total fuel loss but a very 'soft' misfire for about 2 seconds max.
No dash lights or gong.
Carly on the car before I turned it off gave a 002DED error which means nothing really, its like a soft error prior to getting a warning light.
Screenshotted the error and its data which I will attach.
I have been running on E10 for two tank fulls as momentum was not available locally due to a split storage tank, Car was empty when i filled it with momentum today and I reckon it was getting its first taste of the momentum around the time of the error - not sure if that could be relevant.
So guys n gals - any ideas?????
So - 35i - 42k miles - FSH - Full tank of momentum - 6 new BMW injectors 2000 miles ago.
I filled the car up this afternoon and my route home was via a fast (70mph) stretch of dual carriageway.
The slip road is a hard right loop followed by a left 'tweak' as you join the carriageway.
As I negotiated the right loop i put the DCT into sport (not the engine) and accelarated at around 85% throttle.
For a second I thought the rear tyres had lost grip (nothing new car is running a stage 2 MHD map with a fully mapped DCT) but then I realised that I had momentarily lost some - not all - power!
It was not a hard juddering misfire like an electrical failure or total fuel loss but a very 'soft' misfire for about 2 seconds max.
No dash lights or gong.
Carly on the car before I turned it off gave a 002DED error which means nothing really, its like a soft error prior to getting a warning light.
Screenshotted the error and its data which I will attach.
I have been running on E10 for two tank fulls as momentum was not available locally due to a split storage tank, Car was empty when i filled it with momentum today and I reckon it was getting its first taste of the momentum around the time of the error - not sure if that could be relevant.
So guys n gals - any ideas?????
- Attachments
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- carly01.jpg (57.43 KiB) Viewed 447 times
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- Carly02.jpg (58.15 KiB) Viewed 447 times
Mark
Plymouth
E89
35i
Carmine Red
Black leather
Plymouth
E89
35i
Carmine Red
Black leather
- B21
- Lifer
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Soft misfire !
That error is when the DME finds a circuit that is consuming too much current in the given circumstances
Normally it’s associated with comfort access or Bluetooth type things not shutting down correctly when the car is parked
Normally it’s associated with comfort access or Bluetooth type things not shutting down correctly when the car is parked
We choose to go to on with this endeavour at this time and do the other things, not because they are easy, but because they are hard…
A very modified Atacama Yellow 35is
A very modified Atacama Yellow 35is
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- Senior Member
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- Joined: Sun Nov 20, 2016 2:49 am
Soft misfire !
1 Does this mean you pressed the accelerator 'hard and fast'? If it does, your "soft misfire" may be a common fault.
2 Since you drive the route often, testing this possibility will be easy, of course. Just try it again each day this week.
3 I suspect the "soft misfire" will happen again if you can replicate the same circumstances.
4 The solution is to avoid the "85% throttle".
Vidi, vici, veni
- smorris_12
- Member
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- Joined: Mon Apr 18, 2022 2:14 pm
- Location: Somerset
Soft misfire !
I'd say traction control was having a mild intervention. Possibly a wheel skipped on a stone or slidey bit and, with the yaw sensor showing a lateral load, decided to do a Jeeves like intervention.
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Scott
Where are we going and why am I in this handbasket?
2006 Z4 2.5si Silbergrau und rot
Scott
Where are we going and why am I in this handbasket?
2006 Z4 2.5si Silbergrau und rot
- Rockhopper
- Senior Member
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- Location: Mansfield
Soft misfire !
Why did such a low mileage car need a new set of injectors? What’s the back story to that?
- smorris_12
- Member
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- Joined: Mon Apr 18, 2022 2:14 pm
- Location: Somerset
Soft misfire !
Aren't N54/55 injectors the prone-to-failure piezo ones?
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Scott
Where are we going and why am I in this handbasket?
2006 Z4 2.5si Silbergrau und rot
Scott
Where are we going and why am I in this handbasket?
2006 Z4 2.5si Silbergrau und rot
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- Senior Member
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- Joined: Fri May 26, 2017 3:40 pm
- Location: Plymouth
Soft misfire !
But if I avoid 85% throttle that means using 84% throttle max pernmanently!!Busterboo wrote: ↑Tue May 30, 2023 6:23 pm1 Does this mean you pressed the accelerator 'hard and fast'? If it does, your "soft misfire" may be a common fault.
2 Since you drive the route often, testing this possibility will be easy, of course. Just try it again each day this week.
3 I suspect the "soft misfire" will happen again if you can replicate the same circumstances.
4 The solution is to avoid the "85% throttle".
Mark
Plymouth
E89
35i
Carmine Red
Black leather
Plymouth
E89
35i
Carmine Red
Black leather
-
- Senior Member
- Posts: 2552
- Joined: Fri May 26, 2017 3:40 pm
- Location: Plymouth
Soft misfire !
Hi Scott, you know, I think you might be right with that idea, will bear this in mind....smorris_12 wrote: ↑Tue May 30, 2023 6:29 pm I'd say traction control was having a mild intervention. Possibly a wheel skipped on a stone or slidey bit and, with the yaw sensor showing a lateral load, decided to do a Jeeves like intervention.
Mark
Plymouth
E89
35i
Carmine Red
Black leather
Plymouth
E89
35i
Carmine Red
Black leather
-
- Senior Member
- Posts: 2552
- Joined: Fri May 26, 2017 3:40 pm
- Location: Plymouth
Soft misfire !
Well, its a 35 - in a word they are mechanically diabolical in regards to reliability but epic in regards to performance and tuning capacity.Rockhopper wrote: ↑Tue May 30, 2023 6:42 pm Why did such a low mileage car need a new set of injectors? What’s the back story to that?
I bought my car with 24k on it, FSH and annual BMW safety checks, hot garage stored and immaculate.
At 24k the car had already had a new HPFP, only 15k when that failed!!
My injectors were version 8 if I remember correctly, only one failed but the correct procedure is to replace all 6 at the latest version (12).
Car has also had a new radiator - iDrive display (£2600!!!!!!) - heater fan motor - Full DCT filter/oil/sumpand gasket job at 30k and its already weeping again (MOT last week picked that up) shite plastic sump pan is the reason, new rear lamp clusters. The coolant cap came off, luckily I was just arriving home so no damage done (hell of a mess though), countless diagnostic sessions and a few other bits n bobs.
Cam cover gasket has also started weeping, noted at MOT last week.
Its a love hate relationship lol
Mark
Plymouth
E89
35i
Carmine Red
Black leather
Plymouth
E89
35i
Carmine Red
Black leather
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- Senior Member
- Posts: 2552
- Joined: Fri May 26, 2017 3:40 pm
- Location: Plymouth
Soft misfire !
Yep they are Piezo typesmorris_12 wrote: ↑Tue May 30, 2023 6:45 pm Aren't N54/55 injectors the prone-to-failure piezo ones?
Mark
Plymouth
E89
35i
Carmine Red
Black leather
Plymouth
E89
35i
Carmine Red
Black leather
- Nictrix
- Lifer
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- Location: Paisley
Soft misfire !
This sounds similar to what my car does on a few back roads around me and one every morning on the way to work.
Its not a fast bend, around 40 in a 60 limit, but you must slow for the bend. Half way around the bend when I press the go pedal it takes a second before the engine responds.
I have assumed that it is the car trying to keep me on the road as the steering is turned while asking for power.
Its not a fast bend, around 40 in a 60 limit, but you must slow for the bend. Half way around the bend when I press the go pedal it takes a second before the engine responds.
I have assumed that it is the car trying to keep me on the road as the steering is turned while asking for power.
E89 2014 35i M Sport Black with Black leather
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- Senior Member
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Soft misfire !
It isn't the percentage, is it? It's how to get to the percentage. So, in simple terms, floor the pedal 100% and the car can't seamlessly deliver 100% of its power (of course). The E89 ain't a dragster.
In the situation you described, is it possible that the demand for too much power too quickly produced what you called a "soft misfire"?
Try it again and see.
Vidi, vici, veni
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OnlineMiyli
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- Location: Finland
Soft misfire !
Are the ignition coils original or replaced sometime ?
BMW Z4 g29 m-sport Alpinweiss 3
Previous BMW Z4 35i DCT M-Sport Alpinweiss 3
534hp / 803Nm (592 lb/ft)
Hybrid turbos, MHD Custon E85 software, Xhp, DP, FMIC, DCI, Chargerpipe,
Previous E92 n54 335ia 600hp
Previous BMW Z4 35i DCT M-Sport Alpinweiss 3
534hp / 803Nm (592 lb/ft)
Hybrid turbos, MHD Custon E85 software, Xhp, DP, FMIC, DCI, Chargerpipe,
Previous E92 n54 335ia 600hp
- B21
- Lifer
- Posts: 5457
- Joined: Tue Oct 05, 2021 7:15 pm
- Location: In my Banana Yellow Space Shuttle...somewhere over Southern Caledonia
Soft misfire !
I suspect you had a transient misfire due to using lower rating fuel..MHD V10 stage 2+ is very aggressive in timing and already has many corrections at the best of times..
Misfire at around 85% is fairly typical..
As suggested how old are the coils? Supplier?
Misfire at around 85% is fairly typical..
As suggested how old are the coils? Supplier?
We choose to go to on with this endeavour at this time and do the other things, not because they are easy, but because they are hard…
A very modified Atacama Yellow 35is
A very modified Atacama Yellow 35is
- B21
- Lifer
- Posts: 5457
- Joined: Tue Oct 05, 2021 7:15 pm
- Location: In my Banana Yellow Space Shuttle...somewhere over Southern Caledonia
Soft misfire !
N54 is fly be wire throttle…so irrespective of what position you put the accelerator pedal to it’s the DME that decides what to do…Busterboo wrote: ↑Sat Jun 03, 2023 12:15 amIt isn't the percentage, is it? It's how to get to the percentage. So, in simple terms, floor the pedal 100% and the car can't seamlessly deliver 100% of its power (of course). The E89 ain't a dragster.
In the situation you described, is it possible that the demand for too much power too quickly produced what you called a "soft misfire"?
Try it again and see.
What may have happened is if one wheel lost traction the e-diff may have intervened by firstly braking the spinning wheel then shutting power down briefly..
We choose to go to on with this endeavour at this time and do the other things, not because they are easy, but because they are hard…
A very modified Atacama Yellow 35is
A very modified Atacama Yellow 35is