E70 smooth running controller
 

Hi,
I have a ‘08 E70 3.0 sd.
Some time ago, I felt that the engine was running a little rough on idle speed in the morning for a few seconds and after a test with Ista D i got a smooth running controller error.
After testing the values, the cyl 2 was at about 5, over the limit.
I replaced the injector with a new one, but i still get the same error.
I measured the injector rates for about 20 minutes, and the values were above the limit only while the engine was on idle, and only when it was cold.
After 8-10 minutes of driving, all the values were normal.
Dies anyone know what might be the problem?

Thanks in advance
manos

I would think that glow plugs could be a culprit, but they would throw an error code on INPA. They will cause it to run rougher for a couple of mins till it warms up.


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I replaced 2 of them about a year ago, and the controller also, but currently i don't get any error about them.

Did you have an error related to the injector? or just a guess?

I forget, do those injectors need to be calibrated, or some other type of reset???

I thought glow plugs shut off as soon as engine starts.

I did a smooth running test with ista d, and the quantity on 2nd cyl was above 5, while the max limit is 4.

I recall using this test on an S62, I think it translated to 'run unrest'.

Turns out that it was due to a bad coil on the cylinder immediately BEFORE the one that was showing up as 'unrested' (so to speak)

Not sure what would cause that in a diesel.

Replacing injector does require adjustment. See here.

Is this injector value visible while it is mounted or do i have to dismount it?
So to check if it is registered in the DDE.
Although I believe that it must be registered cause i replaced the injector to an authorized service center.

Thanks for the help

I recall reading that the DDE executes an algorithm to improve running smoothness. It will make minute changes in injection quantities to individual cylinders to improve smoothness. This might explain why problem disappears when warm.

I won't be able to tell you, bud. From m diagram below, looks like it won't be visible..

https://www.newtis.info/tisv2/obj/N3Hyw2O

You can read it on top, I used a cheap borescope camera. Just look around that flat part that surrounds the top nut for fuel line.

8887ASG in this photo

https://3a663eb0fef48c6d2d60-a88f8eb...49386_x800.jpg

I took the car back to the service center. They exchanged the injectors with another cylinder, but the problem remains on 2nd, so the problem for sure is not on the injector.
They also measured the compression and it is ok.
They told me that i can take the car, and that i will not a have a problem although that is running rough for a while, when it is cold.
Any ideas about it?

Did the 'service center' reset the injector adaptation with each change of injectors???

They said they did, otherwise the injection is not going to wok

Injectors DO work without coding the injectors, but may lead to rough running.

Have you checked the glow plugs, any codes regarding them? Glow plugs help combustion when the engine is cold.

No error about the glow plugs. I replaced 2 of them about a year ago, and the controller also. But currently no errors about them.

OP, you don't sound very confident regarding shop coding the new injector.
You may want to check what program the shop used, what "coding" means to them, etc.
Else, go down an expensive rabbit hole replacing other things.

I am pretty sure they coded the injector, as I said they are an authorized service center and dealer for BMW, I am sure that they know the correct procedure for it.
At least they told me they coded it, what can I say?

Know that diesels can be rare (more so in the USA than OUS) so many BMW dealers (aka 'authorised center') may not be as expert as we might hope.

If they told you "yeah, it wouldnt run if they werent coded", that is a red flag. They are lying or mistaken. Just saying....


They need to recode adaptation even swapping injectors-

Just comments- we know you have to rely on their honesty.

I just called them to sort this out.
Coding has been done for sure.

Did you ever sort this because I have the same problem with the same code smootless controller