[Romo]

Originally Posted by MR.

Interesting! There must have been a log in the on-board computer. The car does not go in limp mode out of nothing. Really interesting it did not record a message in the error log or the dealer just did not look properly.

MR

Yes, the warning was visible in the OBC log, 2 times off course, but there where no faults assigned to the warning.

So the warning had no meaning, that`s why the dealer thought it was a software issue, so re-installation was done, since than I have maxed out the car several times on the German BAB, multiple times hit the 273 km/h, no problems what so ever.

[zenmaster]

This should be in the engine / exhaust mods section.

[Romo]

Originally Posted by zenmaster

This should be in the engine / exhaust mods section.

Why?

My car is stock, no mods what so ever.

[zenmaster]

Originally Posted by Romo

Why?

My car is stock, no mods what so ever.

This thread.

[Artemis]

FWIW, cross referencing to the recurrent limp mode issue recently reported by forum fellow photos_by_ronnie: http://f87.bimmerpost.com/forums/sho....php?t=1312652

Some excerpts:

Originally Posted by photos_by_ronnie

Just went in for my break-in service at 978 miles, and everything seemed to go smoothly. Then at 1,002 miles after passing someone at partial throttle, about 80%, I got a dash light and a message in the iDrive.
Drive Manflunction: Drive Moderately. Maximum drivetrain output not available. Consult service center.
And the car drives like CRAP. It feels like the power has been reduced to less than 50%, I can barely get it up to 75 MPH. And at one point while I was slowing down to turn into a parking lot, it misshifted while downshifting into 2nd, the car is a DCT.
Unfortunately I was taking it on a road trip so I've already put another 500 miles on it, and run into this problem 4 times already at WOT. It doesn't always go into limp mode at WOT, maybe about 20% of the time, but always at 120 mph+. I checked the service receipt, and the paperwork lists my car as a M235i which doesn't inspire confidence...but it seems they probably used the correct diff oil, part #83-22-1-470-080.
Any ideas? I still have another 400 miles to go before I reach a BMW dealership so they can check it out.

Originally Posted by photos_by_ronnie

Only "mod" on the car is a cat less downpipe, but that shouldn't affect the drivetrain. Keep in mind, this is not a check engine light, this comes up as a different light with the idrive saying "drivetrain malfunction".

Originally Posted by photos_by_ronnie

Just got the call. Apparently my rear o2 sensor failed. They seem to think it's normal and they want to replace it for me tomorrow once they get the new part in. In all the cars I've owned, ironically it's always the bone stock ones with o2 sensor failure. But I think I will be removing my downpipe just to be safe in the future.

Originally Posted by pruettfan

Happy to hear it was something simple, had a feeling it would be. I think it's smart to drop the mod and go back to stock. It's a great car as it comes out of the box, drove the hell out of one for a couple of days at M school last week it doesn't really lack for performance at all.

[DKX4///M]

I love these posts where 20 forum members most of which never turned a wrech in there lives beside maybe an oil change but sometimes that would surprise me...

To OP, props on info gathering, as I am the same learn as much as possible...But from independent or well read experienced techs of books, better yet hands on... You will never get anything close to a diagnosis from ANY member that tries to help you...And the member that could help wouldnt waste there time posting..

For ex, someome bringing up 02 sensors...02 sensor would never put ur car into limp mode. Its an obdii sensor...basically there to determine exhaust contents and determine the cats functionality...its called an output sensor...id reads 6 cylinders blended together a few seconds after the combustion so it cannot be used primarily to determine ANYTHING...Just one example.

Any I have a similar issue, and mine is due to a misfire at high rpms...(prob from a flash) bring it to a bmw specialist...Or see how mod friendly your SM is..Mine lets me do anything lol...

And btw just to be clear does it say drivetrain malfuction?

[MR.]

Originally Posted by DKM3Power

And btw just to be clear does it say drivetrain malfuction?

Yes it does!

Still waiting for more information from the partners I am working with. Let's see what the final outcome is.

In the end we all learn from it and with the winter being there now, I am not going to touch 210+ kmh on any highway in Europe anyhow. So we have some time to find the issue.

MR

[SeanWRT]

Any updates?

[MR.]

Really soon! Working on it right now. I will have the 30k km service on the 7th, and I hope to have a final answer for you then.

MR

[M3 Adjuster]

Originally Posted by DKM3Power

I love these posts where 20 forum members most of which never turned a wrech in there lives beside maybe an oil change but sometimes that would surprise me...

To OP, props on info gathering, as I am the same learn as much as possible...But from independent or well read experienced techs of books, better yet hands on... You will never get anything close to a diagnosis from ANY member that tries to help you...And the member that could help wouldnt waste there time posting..

For ex, someome bringing up 02 sensors...02 sensor would never put ur car into limp mode. Its an obdii sensor...basically there to determine exhaust contents and determine the cats functionality...its called an output sensor...id reads 6 cylinders blended together a few seconds after the combustion so it cannot be used primarily to determine ANYTHING...Just one example.

Any I have a similar issue, and mine is due to a misfire at high rpms...(prob from a flash) bring it to a bmw specialist...Or see how mod friendly your SM is..Mine lets me do anything lol...

And btw just to be clear does it say drivetrain malfuction?

What kind of post is this?

you state that you want to learn about your car... and then state that it's impossible to learn from anyone on a forum... that anyone that responds has no clue.. and anyone that does have a clue.. wouldn't respond?

Is there any help for the OP in your post or just a poor doomsday prediction?

Let's move on to the discussion of turning a wrech [sic]

I have turned a wrench or two on a bmw once in awhile... and while I may not be an experienced tech (or a book ) your comment on O2 sensors appears to be woefully inaccurate?

I can tell you that I missed a track weekend once due to a faulty 02 sensor. My car wouldn't run properly on track at Mid Ohio and I replaced all manner of fuel and ignition component items in the paddock only to eventually give up and take it home. I later discovered that an 02 sensor can go bad prematurely from bad quality fuel, racing fuel, and of course fuel with lead will also accelerate the deteriorating effects the exhaust gases & particles have on the sensor. I replaced the 02 sensor and the car ran fine... My weekend tow to the track was ruined by a $150 02 sensor that had failed that was less than one year old! After that... I installed an air/fuel gauge!

Since I'm not an SAE trained mechanic.. Perhaps I'm wrong... but it's my understanding that most current BMWs have FOUR 02 sensors. Two ( one on each bank of cylinders ) before the catalytic converter and two after the catalytic converter. Therefore there is no " blending of exhaust gases from six cylinders" at any point on a modern BMW (excepting a V12) until the rear muffler. In addition, the pre-catalyst 02 sensors and post catalyst 02 sensors certainly do different things.

pre-cat oxygen sensors are used specifically for controlling the air to fuel ratio of the engine. they will affect drivability, and fuel mileage.

post cat sensors are only used to monitor the oxygen storing capability of the catalytic converter. they will not affect drivability or fuel mileage..

however, both CAN cause a check engine lamp. so one should make sure you know which sensor is setting the code.

most systems have a sensor 1, which is in the manifold or located just before the cat. sensor 2 will usually be after the catalytic converter, if the vehicle has 2 sensors. if the vehicle has 3 sensors, position 3 is always after the converter.

Unless I am grossly in error.. It seems to me that your comment regarding a failed 02 sensor not causing a drivability issue is in error.

Since pre-cat oxygen sensors are used specifically for controlling the air to fuel ratio of the engine... if a sensor here is failing and reading Lean.. then the ECU will attempt to adjust the air fuel ratio to RICH.. causing additional fuel to be added to the mixture. This additional fuel can affect drivability by causing rich misifres.... which usually cause the vehicle to not accelerate properly due to the overly rich fuel mixture.. . An overly rich mixture at low rpm can cause hesitation and bucking and improper detonation and may even cause the motor to stall or die.

An overly rich mixture at HIGH rpm for the most part is better than running lean.. however unburned fuel detonating in the exhaust can disrupt exhaust gas flow, cause additional heat at the exhaust valves, and of course unburned fuel can detonate anywhere in the exhaust system or as the fuel exits the exhaust.

Whether or not the vehicle would even go into limp mode likely will be dependent upon how bad the fuel mixture is off and whether or not the post catalytic 02 sensor can detect the improper fuel mixture after the catalyst.


best of luck to you in sorting out your own high rpm misfires....

[riske]

sorry to bring this old post back but was there any resolution?

My car has always been noticebly juddering on idle (thought it was how these are) however recently got worse and gone into limp mode on consecutive drives. It's running lumpy and misfiring. The CEL will not reset now after restarting but the info doesnt show codes on iDrive.

I got it to BMW and they said my car was supposed to be recalled to replace the rear diff?!?! Oh thanks for letting me know
Getting it done whilst they would look at the CEL and limp mode.

Anyway they rang me just now saying the car is saying things have been unplugged when they are clearly plugged in. What does this mean?

How likely are they to resolve this issue?
Can BMW void warranty if an induction kit was installed previously, what about catless DP??
The car is standard now as i thought it might of been the eventuri but the car still ran like crap.

[Artemis]

Originally Posted by riske

sorry to bring this old post back but was there any resolution?
My car has always been noticebly juddering on idle (thought it was how these are) however recently got worse and gone into limp mode on consecutive drives. It's running lumpy and misfiring. The CEL will not reset now after restarting but the info doesnt show codes on iDrive.
I got it to BMW and they said my car was supposed to be recalled to replace the rear diff?!?! Oh thanks for letting me know
Getting it done whilst they would look at the CEL and limp mode.
Anyway they rang me just now saying the car is saying things have been unplugged when they are clearly plugged in. What does this mean?
How likely are they to resolve this issue?
Can BMW void warranty if an induction kit was installed previously, what about catless DP??
The car is standard now as i thought it might of been the eventuri but the car still ran like crap.

Did you experience any gremlins in the period before you installed the mods ?

[SeanWRT]

Originally Posted by riske

sorry to bring this old post back but was there any resolution?

My car has always been noticebly juddering on idle (thought it was how these are) however recently got worse and gone into limp mode on consecutive drives. It's running lumpy and misfiring. The CEL will not reset now after restarting but the info doesnt show codes on iDrive.

I got it to BMW and they said my car was supposed to be recalled to replace the rear diff?!?! Oh thanks for letting me know
Getting it done whilst they would look at the CEL and limp mode.

Anyway they rang me just now saying the car is saying things have been unplugged when they are clearly plugged in. What does this mean?

How likely are they to resolve this issue?
Can BMW void warranty if an induction kit was installed previously, what about catless DP??
The car is standard now as i thought it might of been the eventuri but the car still ran like crap.

What are your mods?

[riske]

Originally Posted by Artemis

Did you experience any gremlins in the period before you installed the mods ?

Yes very first day i drove it, hesitations. Thought it may have been because it hadnt been run in yet.
At idle i noticed the car juddered ever so slightly. I thought it was down to being M performance car (previous cars have been diesel BMWs)

Since then the odd hesitation or limp mode which wouldn't be regular or throw up errors in the vehicle information. Also stop start had stopped working.
Car has been ok since installing the Eventuri 1 month ago. However this past week it's been almost everyday. With and without the intake.

I'm hoping it's just failed O2 sensor like suggested before.
BMW are carrying on with diagnostics.