335xi only surging when rolling through low gears

Kennybruv · 07-12-2023, 09:08 PM

Hello my car seems to have this weird surge when I'm trying to roll with no gas in low gears. I mainly notice it when going through parking lots or trying to park, the car jerked hard once and almost had me hit a car ! The car will rev on its own but will never surge during startup or while idle. I thought maybe it was the injectors still dumping fuel but I figured it would give me weird cold starts if they were broken or leaky. Any help would be appreciated!

AWD Addict · 07-27-2023, 01:14 PM

Maybe a harness/wiring issue? Tough one.

Kennybruv · 07-27-2023, 02:11 PM

I don't have any codes that would indicate a electric issue, only code I had was for transfer case oil abrasion which I just got the oil replaced today but haven't tested for the issue yet or noticed it within my 15 min drive.

PorscheWizard · 07-27-2023, 02:30 PM

@[Kennybruv] : Hi -- Check the ground cables mainly the one that is grounded from the engine block on the top. (Passenger side, next to the windshield washer mouth, you'll see it. It's like 6 inches from the wall to the bloc) The 2nd one : It is located by the driver side header-to-xpipe connection from the bottom view. Need the car in the air.

These wires get corded overtime and will make the engine feel like it's about to choke and come out of the hood lol... (This is a quick way to rule that out...) Hope this helps, cheers!

Kennybruv · 07-27-2023, 02:32 PM

I will indeed check this out later or tomorrow morning. Car seems to be from up north so this could be a possibility.

alex35i · 07-29-2023, 01:26 PM

did you do the transfer case reset after changing the fluid. that helped my xdrive with a surge i was experiencing.

Kennybruv · 07-29-2023, 01:54 PM

It didn't seem like the shop reset any adaptations for tcase and tranny. I did check the top ground for any corrosion as mentioned above but didn't find anything out of ordinary. I was thinking maybe this could be a carbon build up issue?? Car has 118k on dash

Serf27 · 08-08-2023, 02:21 AM

A crank sensor on my n54 did something similar, if not the same thing.
When coming to a stop, nearly stopped, the rpms would jump and the car would jolt forward.

07-12-2023, 09:08 PM	#1
Kennybruv New Member 5 Rep 21 Posts Drives: Bmw 335i Join Date: Apr 2022 Location: Florida iTrader: (0) Garage List 2011 BMW 335xi [0.00]	335xi only surging when rolling through low gears Hello my car seems to have this weird surge when I'm trying to roll with no gas in low gears. I mainly notice it when going through parking lots or trying to park, the car jerked hard once and almost had me hit a car ! The car will rev on its own but will never surge during startup or while idle. I thought maybe it was the injectors still dumping fuel but I figured it would give me weird cold starts if they were broken or leaky. Any help would be appreciated!
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07-27-2023, 01:14 PM	#2
AWD Addict Chief Executive 300 Rep 2,886 Posts Drives: 2008 335xi 6spd Coupe Join Date: Dec 2007 Location: Boston iTrader: (1) Garage List 2008 335xi [0.00]	Maybe a harness/wiring issue? Tough one.
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07-27-2023, 02:11 PM	#3
Kennybruv New Member 5 Rep 21 Posts Drives: Bmw 335i Join Date: Apr 2022 Location: Florida iTrader: (0) Garage List 2011 BMW 335xi [0.00]	I don't have any codes that would indicate a electric issue, only code I had was for transfer case oil abrasion which I just got the oil replaced today but haven't tested for the issue yet or noticed it within my 15 min drive.
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07-27-2023, 02:30 PM	#4
PorscheWizard Registered 0 Rep 1 Posts Drives: Ultimate Driving Machines from Join Date: Apr 2023 Location: Canada iTrader: (0)	@[Kennybruv] : Hi -- Check the ground cables mainly the one that is grounded from the engine block on the top. (Passenger side, next to the windshield washer mouth, you'll see it. It's like 6 inches from the wall to the bloc) The 2nd one : It is located by the driver side header-to-xpipe connection from the bottom view. Need the car in the air. These wires get corded overtime and will make the engine feel like it's about to choke and come out of the hood lol... (This is a quick way to rule that out...) Hope this helps, cheers!
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07-27-2023, 02:32 PM	#5
Kennybruv New Member 5 Rep 21 Posts Drives: Bmw 335i Join Date: Apr 2022 Location: Florida iTrader: (0) Garage List 2011 BMW 335xi [0.00]	I will indeed check this out later or tomorrow morning. Car seems to be from up north so this could be a possibility.
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07-29-2023, 01:26 PM	#6
alex35i Private 8 Rep 97 Posts Drives: BSM 2008 E90 335XI Join Date: Aug 2013 Location: North Georgia iTrader: (1)	did you do the transfer case reset after changing the fluid. that helped my xdrive with a surge i was experiencing.
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07-29-2023, 01:54 PM	#7
Kennybruv New Member 5 Rep 21 Posts Drives: Bmw 335i Join Date: Apr 2022 Location: Florida iTrader: (0) Garage List 2011 BMW 335xi [0.00]	It didn't seem like the shop reset any adaptations for tcase and tranny. I did check the top ground for any corrosion as mentioned above but didn't find anything out of ordinary. I was thinking maybe this could be a carbon build up issue?? Car has 118k on dash
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08-08-2023, 02:21 AM	#8
Serf27 Brigadier General 2851 Rep 4,322 Posts Drives: 335i Join Date: Apr 2018 Location: Sitting in a BMW. iTrader: (-1)	A crank sensor on my n54 did something similar, if not the same thing. When coming to a stop, nearly stopped, the rpms would jump and the car would jolt forward.
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