RS
Just before you put a new injector on it would be an idea to confirm that it isn't commanded to do that. An amp clamp will give you that in 2 minutes.
I had a Audi RS6 some years ago that would throw / spray petrol out of the exhaust (cats cold) about 2 metres, that was the ground side switched wire short to ground holding the injector open.
Low compression could just be bore wash but I see 2 cylinders low ??
Your primary is still looking messy. It just came to mind that BMW do fire the Coils 3-4 times with the piston on power stroke only at idle, have seen it myself. Think they call it Multi Strike ? Could be wrong.
Last edited by STC on Thu Sep 29, 2016 11:28 am, edited 1 time in total.
Here I am again. I'm still fight with BMW. Mounted the new coils and spark plugs but without success...
Then I made a test injectors and finally ...
As soon as I mounted the new injector I will continue with waveforms.
I also saw that compression is not good but we'll see how it will work with the new injector.
Try to record injectors curent(at the ECU side) and maybe you will see something like a shorted coil of injector.
You can't see any trouble monitoring primary voltage in this case
Last edited by victor2k on Wed Dec 28, 2016 11:09 am, edited 1 time in total.
Hello
just to say I am now finished with BMW. I am replacing the injector cyl.1, all COP and spark plugs. The engine works quite well but I noticed that the mixture is still rich in bank 1. STFT came down from -25 to -5 and here are stuck and lambda is to highly, that's why I gave the car owner to drive a few days.
I recorded waveforms of injector no.1, primary and secondary ... see that COP transferred from Multi spark system to the ordinary spark system ... why ... I don't know.
Also injector waveform is not well known to me. The direct injection system has a strange injector waveform.
Unfortunately, many waveforms from this car is confuse for me.
You changed the Oil and Filter?
Did that fix the Fuel trims ?
And that fault code, was that due to the Petrol Diluted Oil ?
that COP transferred from Multi spark system to the ordinary spark system ... why ... I don't know.
I would guess that it warmed up, Multispark tends only to be used for cold start up and then only at idle. I would imagine that there would not be enough time to re charge the coils at higher RPM's