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So I did a leak down test to check the rings. Looks good There comes black smoke from Exhaust

So what to do now? This is how the sparkplugs look from the running cilinders What do you think about it? It is a new sparkplug

Thanks for your responses, I think 3DDave may be right about using too much fuel. the plugs are new and when they turn black start with brake cleaner. there MUST be a spark. we can rule this out! we cannot rule out whether it sparks at the right time and whether the injector is working...

So I have tried to let the car running with starting fluid. It really difficult to let it run and start at the same time. But the sparkplug on cilinder 5 is black so I think there is a spark but there is also fuel, the plug is wet while running with fuelinjectors. Maybe to much fuel??

The injectors all connected to the same pins so they not sequencing. So all injectors spray at the same time before the intakevalve I use bosch injectors number 0380155831 I already change the injectors to a working cilinder and no different. I think there is something wrong with the ignition...

Yes it’s a custom ecu but the strange thing is that all the coils spark on the top of the head and in the good firing order! So I don’t know if there is something wrong with ignition or fuelinjection or something with the cilinder. But before make this new setup for the engine(wiring, coils...

Yes I have tried it but the problem is than on the same cylinder as before so everytime on cilinder 5!

With throttle open the same bar at all cilinders around 8,5/9,5 bar

Yes there is 8,5 bar compression with throttle Closed

It concerns an Audi 2.3l 20v 5 cylinder. With pin coils and Bosch injectors. I have connected everything to the ECU and checked the wiring harness. All setting correct in the computer. Now the engine starts, only it runs on 4 cylinders. Cylinder 5 does not participate but the sparkplug does...