08-14-2021, 12:26 PM | #1 |
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Hard acceleration stutter - 2015 335xi MT
Hello all.
I have attempted to find other posts specific to my problem but unable. Here are the details: 2015 335xi M-Performance Manual Transmission 53000 km (33k miles) No Mods Shell fuel 91 octane Recently began noticing during hard acceleration only I get a stutter/hesitation/brief loss of power. This occurs in any gear and happens roughly at 2200 and 3200 RPM. RPM's briefly drop (power loss) but increase within 1-3 seconds (power gain), with a slight shutter. If I continue accelerating hard in the same gear this issue occurs again in the 3000 RPM range. I can continue accelerating without any issues past that point. If I don't hard accelerate I don't notice the problem at all. Spark plugs replaced. Software updated. Thanks for any input! Tim Last edited by tmurphy31a; 08-14-2021 at 12:40 PM.. |
08-14-2021, 01:16 PM | #2 | |
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08-14-2021, 01:18 PM | #3 |
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08-14-2021, 01:31 PM | #4 | |
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had any work been done on the car prior to this happening even if it doesn't seem related?
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08-14-2021, 02:20 PM | #5 | |
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This problem occurred out of the blue with no contributing factors such as recent work, damage to the vehicle, change in fuel. I had a couple of friends drive the vehicle and they did not hear any noise from the engine like a hiss or air escaping - which would point to a charge pipe correct? To help explain the feeling when the problem occurs it feels like a fuel delivery issue - almost like the engine is trying to pull more fuel but not receiving it. The question I am trying to answer is why would this issue occur only when hard acceleration - could it be a fuel delivery issue, or possibly a turbo? Could there be an issue with the drivetrain? If I am experiencing this issue while in gear would the transmission be a factor? Thanks |
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08-16-2021, 11:15 AM | #6 | |
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You should also inspect the CP because you don't always hear boost leaks. It has to be a huge leak and you need to be running a lot of boost to hear it. At stock boost levels its very possible for one to be inaudible from inside the car. |
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08-16-2021, 11:31 AM | #7 | |
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Thanks. |
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08-17-2021, 07:05 AM | #8 |
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Could be your transfer case taking a shit tbh
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08-17-2021, 08:23 AM | #9 | |
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08-17-2021, 02:18 PM | #10 | ||
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08-18-2021, 08:07 AM | #11 |
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08-18-2021, 01:27 PM | #12 | |
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My car just threw the 'Drivetrain Malfunction' code and my issue is happening more regularly, and now at medium+ acceleration. I am waiting on an OBD reader to check the codes and record parameters. This occurs with full/half tank of fuel. Is there an OBD reader you or someone recommends that will allow me to record parameters that I can export and share here? Thanks for the reply! |
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08-18-2021, 01:28 PM | #13 |
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08-18-2021, 03:54 PM | #14 | |
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If you want proper logging capabilities that people are used to, you might need to consider something like MHD's monitoring module. Free apps offer datalogging, but from what ive seen, that usually arent that helpful. |
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08-18-2021, 04:13 PM | #15 |
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08-20-2021, 02:23 PM | #18 |
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This was happening to me and ended up being a bad fuel injector. Do you have a rough cold start?
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08-20-2021, 03:55 PM | #19 | |
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Not sure what a rough cold start would be - I have not noticed any changes with start up. However - roughly around the same time as I noticed this issue I started to feel a vibration at idle - almost like exhaust low hum. My seat will have a slight vibration. I just got my OBD reader so not I have to figure out how to use it - are there parameters specifically you might know to look at? |
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08-20-2021, 04:19 PM | #20 | |
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Hopefully it can at least scan for codes, including shadow codes, and you can go from there. If there's no codes and you cant collect useful data logs you are back to a guessing game or trial and error. |
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08-24-2021, 11:00 AM | #21 | |
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08-24-2021, 11:04 AM | #22 |
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So with my car, i felt it stutter and heard a metallic noise. Showed it to my mechanic and he said the transfer case is on its way out. I took his word cause he's dealt with it on plenty of cars mainly f10s, 328i 328d as well as many e9Xs
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