E70 smooth running controller

[mxxxs]

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

[BevMW]

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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[mxxxs]

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

[ard]

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???

[pshovest]

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

[mxxxs]

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

[ard]

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.

[seattle]

Replacing injector does require adjustment. See here.

Note:
If injectors have been replaced, "injector characteristic map adjustment" must be performed:

Connect BMW diagnosis system
Identify vehicle
Select ”Function selection”
Select ”Service functions”
Select "Digital Diesel Electronics (DDE)"
Select "Injectors adjustment"
Select ”Test plan”
Start "Service" function with right arrow button.

[mxxxs]

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

[seattle]

Originally Posted by mxxxs

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

Note:
In the case of piezo injectors, the seven-digit adjustment value must be stored in the control unit after replacement of an injector.


Read off adjustment value (1) on new injector (2).