Black smoke and engine problems with 2004 Citroën C8: looking for advice

Hey, I recently had similar problems with my 2007 Citroën C5. In my case, the problem was a faulty plug/cable connection. The car ran very rough and accelerating was also a disaster. After a lot of trial and error, it turned out that it was actually the plug/cable connection. With all due respect to the car, it was quite a serious problem. The affected cables had to be completely replaced because they were unstable and in danger of failing completely. It took a few hours to repair everything, but afterwards everything was back to normal. It could well be that you have something similar. A broken injector can certainly cause symptoms like this, but before you go painting the devil on the wall, check the cable connection first. I hope this helps you and you don't have to spend too long in the workshop. All the best!

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Hello, thank you for the quick response. That definitely gives me hope that it might not be the injection valve after all. If you can remember, can you tell me how much the repair cost you? And whether any other problems have occurred since then? I'm just asking to get an idea of what I might be facing. Thank you in advance!

(Translated from German)

I'm glad that my comment has given you hope. So, the repair of the defective plug and the cable connection cost me €155. That was quite a small sum, but since then my Citroën C5 has been running like clockwork. And as far as the injection valve is concerned, it actually turned out to be faulty. But since I got the mechanic on it, everything has been running smoothly again. So don't stress, it can definitely be fixed! Hope you get through it well and that your car is back on track soon! Good luck!

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Thank you very much for the information and encouragement! Your explanation helped a lot and I now have a clearer idea of what to do. The repair costs are even less scary than I expected. I will look into the options and go to the mechanic with info gathered. I'll let you know how it goes. Hopefully it will go as smoothly as it did for you. Until then, thanks again and take good care of yourself!

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Hello, my car is displaying error P0203. Do you have an installation video for changing the injection valve on my Citrön C2? MfG.

(Translated from German)

Hello DAR75, the error code P0203 indicates an issue with the fuel injector circuit in cylinder 3. While I don't have a video, I can guide you through the process. However, please note that working on the fuel system can be risky if you're not familiar with it. If you're not comfortable doing it yourself, I'd recommend taking your car to a professional mechanic. If you still want to proceed, here are the steps: 1. Disconnect the battery. 2. Remove the engine cover. 3. Locate the fuel rail and the injectors (they are usually on top of the engine). 4. Disconnect the electrical connector from the injector that's causing the problem (in your case, injector 3). 5. Remove the fuel rail and the injector. Be careful, as there might be residual pressure in the fuel rail. 6. Install the new injector, making sure it's properly seated. 7. Reinstall the fuel rail. 8. Reconnect the electrical connector and the battery. 9. Start the car and check if the error code is gone. Remember to work in a well-ventilated area and keep a fire extinguisher nearby, as you'll be working with gasoline. Please let me know how it goes or if you have any further questions.