Problems with Audi A4 2009: Black smoke, long cold starts and unstable engine.

Hi, I once had a similar situation with my 2007 Audi A6, I have limited experience in dealing with cars so I hope my advice is helpful. When it was checked at my garage, they found that my fuel injector was internally faulty. They had to replace it, which cost just over 500 euros. If you could share more details, like the exact model number and mileage, I might be able to give more insight. Would also be interesting to know if you had anything replaced recently? Hope that helps a little!

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Thank you for your answer, it is very helpful. My Audi is an A4 model and now has an impressive 182501 km on the clock. The last service was actually not too long ago and nothing major was replaced. Your advice about the injection valve makes sense. I will ask my garage about this. It's just annoying that it could be so expensive. But it is what it is. Thanks again!

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No problem, I'm glad I could help. Your A4 has already done quite a few kilometers, so it's not surprising that some parts are starting to cause problems. Given the number of kilometers, a defective injection valve is a distinct possibility. It's really unfortunate that the repair could be so expensive, but it's better than wrecking the engine completely. And unfortunately, these components are not exactly cheap at Audi. It is important that you have it checked as soon as possible and repaired if necessary, so you can avoid further damage. I wish you good luck with this, hopefully it will solve your problem! Let me know what you find out.

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Thank you for your assessment and support. I now also have the idea that it could definitely be the injection valve. I realize that solving the problem quickly can prevent more extensive damage and costs over time. I will have it checked at the garage on Monday and hope it won't be that expensive. I'll keep you posted as soon as I have any news. Thanks again, your advice is really appreciated. See you soon!

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Hello Gerry, In my Passat, it was also the injection valve or injector that was defective. Unfortunately, the high-pressure injectors are extremely expensive compared to normal injectors. I also paid around €450 including installation and tune-up.

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Hello, perhaps there is a company near you that can also check these. Often a revision is also feasible (but does not work with all injectors...). Greetings Max

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Hello I have replaced the coolant pipe in my a6 c6 2.4 v6 gasoline engine which goes from bank to bank only now after that I have the problem that the car shows me when reading out encoder for ignition timing unfortunately I am over-questioned because the car has clear dropouts

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It sounds like the timing of your engine might be off. This could be due to a variety of reasons, such as a faulty camshaft position sensor, a timing belt that has jumped a tooth, or even a problem with the engine control module. I would recommend starting with the easiest check, which is to inspect the camshaft position sensor for any visible damage or loose connections. If that doesn't reveal anything, you might need to have a mechanic check the timing belt and engine control module. Please keep us updated on your progress.