[Sal Collaziano]

At full throttle tonight, it felt like my both tires were spinning. A couple of moments later I noticed the "service engine soon" light on - and the car got very rough. The higher the idle, the rougher it got. Under smooth acceleration, it was hardly noticeable. After a few minutes, the light went off and everything went back to normal. Upon full throttle acceleration, it happened again. I turned the car off to go where I needed to be and on the way back out, started it up and everything was fine. Of course, under full throttle, it happened again.

So... I used the Bavarian Technic cable and it came up with the following. Any thoughts? Thanks in advance...

29D1: Misfirings, cylinder 5
Error will cause a warning light
Error is not currently present
Test conditions have been completed
Short circuit or signal interruption
Freeze Frame Information

Event 1
Odometer 65400kms 40637miles
Engine temperature 93.75 °C
load value for misfire detection 89.06 %
Engine speed 5,408.00 rpm
Lambda integrator group 2 18.75 %

Event 2
Odometer 65512kms 40707miles
Engine temperature 91.50 °C
load value for misfire detection 90.23 %
Engine speed 4,704.00 rpm
Lambda integrator group 2 17.97 %

Event 3
Odometer 65520kms 40712miles
Engine temperature 94.50 °C
load value for misfire detection 94.14 %
Engine speed 4,960.00 rpm
Lambda integrator group 2 30.47 %


29D9: Misfirings in case of tank filling level too low
Error will not cause a warning light
Error is not currently present
Test conditions have been completed
Signal or value below threshold
Freeze Frame Information

Event 1
Odometer 65400kms 40637miles
rail pressure 100,530.31 hPa
counter recognition bad road 0.00 -
ambient pressure 997.66 hPa
fuel tank filling level 6.00 l

MSD80/MSD81 Engine module for N54

[OpenFlash]

Was your tank low on gas?

[Sal Collaziano]

Quarter of a tank.. Exactly. Should be okay...

[enrita]

pump? spark plugs? Injectors?

[HPFREAK]

Originally Posted by Sal Collaziano

Quarter of a tank.. Exactly. Should be okay...

not really ok as sometimes the fuel level can read off depending on many factors. I have seen mine rise up and down once it gets to 1/4 tank to the point where it may be less than you think. Were you driving it hard at this point or leaving a stop under hard accel? I have had a misfire under these exact conditions in the very same cylinder. There are some issues though with the coils or injectors. You may be able to get all of them replaced. On my car my tech had to open a PUMA case for the injector and they cleared it no problem.

[getInline]

My misfires were caused by bad injectors. If you pull your #5 plug you'll have a much better indication, wet = injector, fouled = plug, ok = fuel pump or coil wire. Unfortunately, unless your getting a half-engine light while running stock it's kinda hard to complain to BMW. I had to wait until mine got so bad I was getting a half-engine light on startup, but at least you would know what the problem is. Don't try pulling the plug unless you have the right socket, a torque wrench and at least some mechanical aptitude.

[Mike@N54Tuning.com]

Could be plug, coil, or injector, but could also indicate too much boost for your octane. Worth a BT log, and maybe swap plugs and injectors with cyl 1 as a test.

Mike

[Sal Collaziano]

Thanks, guys.. I was kinda hoping the fact that the problem went away after a few minutes would indicate something more specific. I guess I'll need to get back to stock and bring the car in...

Originally Posted by Brad@PSI MOTORS

not really ok as sometimes the fuel level can read off depending on many factors. I have seen mine rise up and down once it gets to 1/4 tank to the point where it may be less than you think. Were you driving it hard at this point or leaving a stop under hard accel? I have had a misfire under these exact conditions in the very same cylinder. There are some issues though with the coils or injectors. You may be able to get all of them replaced. On my car my tech had to open a PUMA case for the injector and they cleared it no problem.

Well, I had just got a little more than half tank the day before - and it would be about normal for me to be at a quarter at this point - nothing less. So I THINK the gas gauge is accurate. I wasn't leaving a stop under hard acceleration but I did go full throttle at about 30 miles per hour when it happened.

Originally Posted by getInline

Unfortunately, unless your getting a half-engine light while running stock it's kinda hard to complain to BMW. I had to wait until mine got so bad I was getting a half-engine light on startup, but at least you would know what the problem is.

Seriously? I have a feeling there will be no problem getting this to happen while stock - but if I don't - they're not going to service the vehicle? If they go in and see these codes, that's not an indication that something needs to be changed if they can't duplicate the problem?

Originally Posted by Mike@N54Tuning.com

Could be plug, coil, or injector, but could also indicate too much boost for your octane. Worth a BT log, and maybe swap plugs and injectors with cyl 1 as a test.

Mike

BT log - I think I do have one of those. Are they more telling than the information I copy/pasted? I had the program record a log for this most recent session...

[Sal Collaziano]

Okay, so I set my JB3 from map 5 down to map 3 and I'm not having the problem anymore. Of course, at map 0 it's not there either. This tells me I'm not going to get any help from BMW at all. My only option will be to go with a Dinan flash (which should bring up the problem again so that BMW can rectify it) with a custom JB+.. Since I won't be getting a Dinan high performance oil cooler, I'll be going with a stage 2 flash. Hopefully with the JB+ and a few other things, I'll be seeing the kind of performance I had with my JB3 set at map 5 - which is plenty for me. The way I see it, if your car is faster than mine at that point, congratulations...

Anyway - if this change to a lower map indicates anything, please let me know..

Thanks in advance!

[335e92tx]

I had a 29D1 today on a 200 mile road trip at 65mph. Never even went more than .3 throttle the entire trip.
When stopped at a light noticeable miss - then half engine about 60 miles later
Plugs replaced less than 4K ago.

Runs fine after restart - gonna watch it a bit.

[scalbert]

Originally Posted by Sal Collaziano

Okay, so I set my JB3 from map 5 down to map 3 and I'm not having the problem anymore. Of course, at map 0 it's not there either. This tells me I'm not going to get any help from BMW at all. My only option will be to go with a Dinan flash (which should bring up the problem again so that BMW can rectify it) with a custom JB+.. Since I won't be getting a Dinan high performance oil cooler, I'll be going with a stage 2 flash. Hopefully with the JB+ and a few other things, I'll be seeing the kind of performance I had with my JB3 set at map 5 - which is plenty for me. The way I see it, if your car is faster than mine at that point, congratulations...

It is your vehicle and not the tune in it. Change your plugs; you do have a 2007 so it is due.

[Sal Collaziano]

Originally Posted by scalbert

It is your vehicle and not the tune in it. Change your plugs; you do have a 2007 so it is due.

Thank you. I'll have somebody do the plugs first to see if that takes care of the problem. If not, than I'll move on...

[IL X5 M60i]

Originally Posted by Sal Collaziano

Okay, so I set my JB3 from map 5 down to map 3 and I'm not having the problem anymore. Of course, at map 0 it's not there either. This tells me I'm not going to get any help from BMW at all. My only option will be to go with a Dinan flash (which should bring up the problem again so that BMW can rectify it) with a custom JB+.. Since I won't be getting a Dinan high performance oil cooler, I'll be going with a stage 2 flash. Hopefully with the JB+ and a few other things, I'll be seeing the kind of performance I had with my JB3 set at map 5 - which is plenty for me. The way I see it, if your car is faster than mine at that point, congratulations...

Anyway - if this change to a lower map indicates anything, please let me know..

Thanks in advance!

Hey man I had the exact same thing happen. Take the tune out, don't delete the codes. If it's the same as mine, you need new injectors. If more than two are misfiring on the same side then per the latest SIB they have to replace all of them on that side.

Had that done, run like a dream since!

[Sal Collaziano]

Originally Posted by Chi-Town 335xi

Hey man I had the exact same thing happen. Take the tune out, don't delete the codes. If it's the same as mine, you need new injectors. If more than two are misfiring on the same side then per the latest SIB they have to replace all of them on that side.

Had that done, run like a dream since!

Thanks for replying. Was BMW able to duplicate the problem with your tune out? That's what has me worried.

[Sal Collaziano]

In the meantime, I think I'm just going to have an outside mechanic switch the fuel injectors and/or spark plugs from one position to another and see if I get codes for the new location. If I do, than I know to replace either that injector or spark plug. I'll replace all the plugs if that's what it is.. I'm sure the injectors are a little more expensive, though..

[enrita]

Just change spark plugs. i changed them every 10-15.000 km and when you pull them out you can see that it was time to do so.

[IL X5 M60i]

Originally Posted by Sal Collaziano

Thanks for replying. Was BMW able to duplicate the problem with your tune out? That's what has me worried.

They were able to replicate the misfires. I had brought it in, had them leave it overnight in the cold. When they started it the next morning sure enough it misfired.

Maybe if you can't get the misfire to show up without the tune, it's just the spark plugs?

Hopefully that's the case because I think the injectors are pricey outside of warranty...

[Sal Collaziano]

Just to note, the misfiring started happening on map 3. So I've jumped down to map 1. If it starts happening there, then it'll probably start happening without the JB3 installed - which would mean I could have the problem rectified by BMW. I still may go to the guy mentioned above anyway - it's easier.

[Sal Collaziano]

I took my car to M-Werks (John) in Pompano Beach, Florida and he took care of my car. It was a coil.

I definitely recommend him if anyone has issues in South Florida..

954-478-1888

[Jeff@TopGearSolutions]

Originally Posted by Sal Collaziano

Okay, so I set my JB3 from map 5 down to map 3 and I'm not having the problem anymore. Of course, at map 0 it's not there either. This tells me I'm not going to get any help from BMW at all. My only option will be to go with a Dinan flash (which should bring up the problem again so that BMW can rectify it) with a custom JB+.. Since I won't be getting a Dinan high performance oil cooler, I'll be going with a stage 2 flash. Hopefully with the JB+ and a few other things, I'll be seeing the kind of performance I had with my JB3 set at map 5 - which is plenty for me. The way I see it, if your car is faster than mine at that point, congratulations...

Anyway - if this change to a lower map indicates anything, please let me know..

Thanks in advance!

Edit I was going to say its not the tune but a coil or plug issue. Looks like you got it taken care of.

[Sal Collaziano]

Thank you. It's been all taken care of, however. It was the coil:

http://www.e90post.com/forums/showpo...5&postcount=19

I didn't think it was the tune's fault - just too much power for whatever was going wrong at the time. I originally figured it was a spark plug...

Originally Posted by JPSlick

That doesnt mean its the tune. It means its too much boost, either for injectors, for your plug, or for your octane level.