Black Smoke & Stalling: Infiniti M's Fuel System Crisis

Hey there, I had similar issues with my 2007 Infiniti G35 last year. After changing the fuel filter, I faced error codes and similar symptoms black smoke, power loss, and terrible fuel economy. Turned out my fuel pressure regulator was shot, and it was messing with the fuel-air mixture. The mechanic found that the old regulator had completely failed, causing too much fuel to enter the combustion chamber. It was pretty serious since it could've damaged other engine components if left unchecked. Had it fixed at the dealership when other shops couldn't properly diagnose it. Got it sorted with a new fuel pressure regulator, cleaned injectors, and a thorough diagnostic check. Car's been running smooth since then. Your symptoms sound identical I'd definitely get it checked soon before it causes more problems. For reference, I got mine done at the Infiniti dealership in town. They knew exactly what to look for with these models. Hope this helps!

Thanks for sharing your experience! That sounds exactly like what I'm dealing with. Just wondering do you remember roughly how much the whole repair set you back? And has everything stayed running smoothly since then, or have you noticed any other issues pop up?

Hey again! Since you asked about the costs after getting it fixed at the Infiniti dealership, everything's been running like a charm! They charged me 45€ just to clear the error code after replacing the fuel filter. Money well spent, if you ask me, since the fuel pressure regulator issue got sorted at the same time. I can honestly say I haven't had a single problem since then no more black smoke, stalling, or any of that drama. My G35's been performing beautifully for the past year, and the fuel economy is back to normal. Such a relief! Just make sure you get it checked out soon these symptoms aren't something you want to ignore. The dealership mechanics really know their stuff when it comes to Infinitis, so I'd definitely recommend them over general repair shops. Let me know how it goes when you get it fixed!

Thanks for all that info! I finally got around to getting my car checked out at the Infiniti dealership you recommended. You were right the fuel pressure regulator was the culprit! The repair wasn't as expensive as I feared, and they even spotted a few minor issues I hadn't noticed. Got it all fixed last week, and what a difference! No more black smoke, the engine's running smoothly, and my fuel economy has improved dramatically. Such a relief to have my car back in proper shape. Feels like I'm driving a different vehicle altogether! Really appreciate you sharing your experience it gave me the confidence to get it sorted at the right place. Sometimes paying a bit more at the dealership is worth it for the peace of mind. The mechanics were super professional and knew exactly what they were doing. Thanks again for helping me out with this!