03-07-2024, 09:18 PM | #1 |
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M340i Burning/Smoking Oil From Exhaust With Video
I have a 2021 M340i with 46k miles and the car recently developed this smoking issue only happens in heavy traffic or coming to a stop light on occasion. This does not occur every time and the car is completely fine under spirted driving with no smoke under acceleration or deceleration. Also there is 0 smoke at idle or upon startup. Car is Femto unlocked running MHD e40 tune with a catless downpipe for the past 6k miles. I installed a pcv catch can in hopes if it was a pcv related issue like the gen 1 b58 cars experienced. Catch can caught nothing and the issue is still apparent. My only other guess is that the turbo is starting to go? Oil consumption is quite bad now getting about 300-500 miles per qt of engine oil.
Video: https://vimeo.com/920783750 Last edited by Heck1; 03-07-2024 at 09:30 PM.. |
03-08-2024, 01:49 AM | #2 | |
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03-09-2024, 02:06 PM | #3 | |
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The only real fix would to install head pins blocking off the pcv passage ways in the head and installing Visconti's Gen 2 upgraded valve cover that deletes the pcv system. A proper pcv catch can will work also. But I'm almost certain this will fix the smoking issue we are all facing. |
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03-26-2024, 10:08 AM | #4 |
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So I just did all of that and was about to update my post. I did the pins and replaced my valve cover and it still smoked. I'm running upper and lower catch cans. Initially my DAW turbo was completely dry. After it smoked again, I removed the turbo immediately to go back to stock. Upon a closer look and because it was removed even after just driving it. I could see the oil behind the turbine. My issue the whole time was the turbo. TBH after all of this I recommend driving the car till it smokes. Go back home immediately and remove the turbo to see if you can see the oil like mine.
If you are lucky you can remove the downpipe and see the oil. But initially I could not, I let it cool down too much and by then the oil had dried up. That is why I pinned and replaced the VC. Luckily they are mods I would have eventually done. Just not in the order I wanted to do them. Best of luck! |
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04-13-2024, 07:14 PM | #5 | |
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04-19-2024, 07:34 PM | #6 |
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04-25-2024, 09:41 PM | #7 |
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This was happening to me frequently. Driving hard, normal, after a cold start and when the car was up to operating temps. Didn’t matter. Burning smell and smoke would come from the exhaust. Sometime after that, my oil pressure started going crazy and the car developed a whine. Replaced the oil pump and hasn’t occurred since.
Edit: Should have watched the video first. I only saw the smoke after coming to a complete stop. Never while the car was moving. |
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05-06-2024, 04:42 PM | #8 |
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I did the pins and duel catch can and did not solve the issue. My guess is the oil pump or turbo. I got fed up and traded the car in for a low mile f80.
Last edited by Heck1; 05-07-2024 at 06:07 PM.. |
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