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Thank you all very much for your replies.
So there has been a new development, even stranger then my initial post.
The sound that I was complaining about turned out to be the hybrid pump and it sounds as it should according to the Ford people – issue solved.
BUT…as I mentioned in my original post they have diagnosed a rod knocking on the cars engine and advised to change the engine.
When I went in to pick up the car today I talked to the service manager and mentioned that I have never ever heard a knocking sound in the car while driving or starting the car and that I am shocked about their diagnosis. He offered to take a test drive with me. He started the car and there was no unusual noise what so ever, we started driving, went to the highway, went up hill…..no knocking and he actually said the car sounds perfect in any possible way and that he has to apologize but that it seems one of his guys misdiagnosed the issue. Although very much relieved I could not shake off the feeling that there must have been something that the mechanic has heard so I asked the service manager to listen to the car with me from the outside. And now the mystery part.
We stopped the car, and put it into park. At that point the car shuts off the engine automatically since its a hybrid. He went outside and I floored the throttle to get the engine running while in park and suddenly from nowhere a very clear knocking sound appeared – I have never heard anything like it. The manager looked at me and said: So here it is. You will have to replace the engine – then he walked away.
I turned off the car and turned it on again and the knocking was gone. I then realized that the knocking only appears if the car is in park, the engine off and you floor the throttle to start it again. The knocking does not change in pitch while increasing the rpm but gets faster, it does not sound metallic and it goes away after half a minute and when I switch from park to drive.
So in summary: If your regularly start the car and drive it, there is absolutely no knocking sound but if you put it into park and the engine shuts off and then press the throttle while in park mode to restart, only then you can hear a very clear knocking sound that goes away after half a minute or when you switch the car into drive mode. The car does not make the knocking sound while driving.
Has anyone an idea about what might be going on? Once again any suggestions would be very appreciated.
All the best to everyone