Black smoke and irregular engine running in my 2024 Renault Master Diesel: suspected defective cold start injection valve

Hi, I had similar problems with my 2021 Renault Trafic Diesel. It sounded an awful lot like your situation, with the black smoke and difficulty starting. It turned out that I actually had a faulty engine control unit. It's a serious problem, but it's fixable. My garage really had to focus on troubleshooting, but in the end they were able to locate the problem and fix it. Now my car is running like new again, with stable performance and efficient fuel consumption. Take heart! Good luck with your car!

(Translated from German)

Hi, thanks for the tip about the engine control unit, I hadn't even considered that. I'm glad to hear that everything is back to normal for you. May I ask how much the repair cost and whether any new problems have arisen since then? I hope my Renault Master is not hopelessly broken. Thank you.

(Translated from German)

Hello, I am happy to share my experience with you! After I went to the garage and they repaired the engine control unit, the problem with the cold start injector was solved. However, the repair also cost me a lot. The flashed engine control unit cost me a whole €1000. But since then my Trafic has been running like a dream again and doesn't make any more problems! Your Renault Master is certainly not hopelessly broken. Just make an appointment with a mechanic and have it checked out. Keep your fingers crossed!

(Translated from German)

Hi, thank you so much for sharing your experiences and tips. I am much more reassured now. So, if this is the cause, I would be willing to pay 1000€ to solve my problem. I will make an appointment with the mechanic right away tomorrow and hope for the best. Thanks again, I really appreciate your help! Take care!

(Translated from German)