Macan Diesel: Black Smoke & Power Loss Mystery

I had very similar issues with my 2018 Porsche Cayenne Diesel last year. The symptoms you're describing match exactly what I experienced, rough idle, power loss, and black smoke. Took it to my trusted mechanic, and it turned out to be a failed intake manifold with damaged swirl flaps. The charring around the intake ports was pretty severe. It was definitely a serious issue that needed immediate attention to prevent further engine damage. The fix involved replacing the entire intake manifold assembly and cleaning the intake ports. While they were at it, they also checked the EGR system since these issues often go hand in hand. The whole job took about two days. Given that your Macan is showing the same symptoms, I'd strongly recommend getting it checked soon. These issues typically don't resolve themselves and can lead to more expensive repairs if left unchecked. I got mine fixed at Stuttgart Motors (not real shop name), and they really know their Porsche diesels. Been taking my car there ever since.

Thanks for sharing that, it's really helpful to hear someone had the same problem! I'm going to check out Stuttgart Motors. Just curious, do you remember roughly how much the repair cost you? And has everything been running smoothly since the fix, or have you noticed any other issues pop up?

Hey again! Yeah, I got my Cayenne fixed at Stuttgart Motors and it set me back exactly 1180€ to sort out that intake manifold issue with the charred swirl flaps. Money well spent though, the car's been running like a dream since then! No more black smoke, rough idle, or any of that drama. The mechanics there really knew what they were doing. Once they fixed those swirl flaps in the intake manifold, it was like having a completely different car, smooth as silk! Honestly, it's such a relief not having to worry about those symptoms anymore. Haven't had a single issue pop up since the repair, which was about a year ago now. If you're dealing with the same problem, I'd say don't wait around, get it sorted before it potentially causes more damage. The guys at Stuttgart Motors will take good care of your Macan!

Thanks for all the info! Just wanted to update everyone, I took my Macan to Stuttgart Motors last week, and wow, what a difference! The diagnosis was spot-on, damaged swirl flaps in the intake manifold. Ended up costing me about 1250€, which was totally worth it. They had it fixed in just over a day, and the engine's running beautifully now. No more black smoke, jerking, or power loss issues. The mechanics there were super professional and really knew their stuff. They even showed me the damaged parts and explained everything clearly. Much better experience than my last mechanic! For anyone dealing with similar issues in their Porsche diesel, I'd definitely recommend checking out Stuttgart Motors. Lesson learned, sometimes it's worth paying a bit more for quality service rather than trying to save a few bucks with sketchy mechanics. Thanks again for the recommendation! Really helped me dodge what could've been a much bigger headache.