Gear slip or power issues? Maybe?

arts711 · 09-14-2017, 11:34 AM

Hi all,

Was wondering if anyone ever felt this while accelerating, very brief breaks in linearity of acceleration almost as if it slipped a bit or jerked a bit? If I floor it its not noticeable but if I slowly increase the throttle to floor, there'll be brief little breaks in acceleration as the revs climb. Maybe it could be power transferring to the different wheels, I don't know.

Also I noticed that sometimes around the parking lot the engine would rev itself up before grabbing the next gear

I have an auto m235ix so was wondering if this is something I should be concerned about. Any insight would be greatly appreciated!

MadOzodi · 09-14-2017, 11:54 AM

Quote:

Originally Posted by arts711

Also I noticed that sometimes around the parking lot the engine would rev itself up before grabbing the next gear

I've experienced this upon very light acceleration, as well (RWD). I plan doing an AT Fluid swap sometime soon.

I just chalk it up to the nature of ATs...which could be bad since I my DD has been a manual since I got my license.

amw896 · 09-14-2017, 09:50 PM

Sounds like traction loss

Shayan55 · 09-14-2017, 10:42 PM

are you sure that it isnt a slight misfire? i had experienced something like that in the audi i had prior to the 235 and it was a misfire try to replicate it and listen to the exhaust for hiccups

arts711 · 09-15-2017, 01:59 PM

Never had experience with that, I will see if I can replicate it more. Thanks for the tip.

Smallm · 09-16-2017, 08:19 PM

That little flare when shifting is an emissions thing to reduce the NOX emissions , it's part of the fuel maps in the ECM , I hate it !, I'd literally give my left nut to get rid of it.

XieJin · 09-22-2017, 08:26 AM

I'm experiencing exactly the same symptoms. Slight jerking on 1st and 2nd gear when throttle is below 50%. I do not experience any issues in sport mode nor when accelerating heavily.... Also a M235i xDrive with auto trans

bryan_G01 · 09-22-2017, 09:53 AM

sounds like misfires.

With your foot completely down, does it studder over 5k rpm?

What gas are you using? Are you tuned? What boost ?

Anthony235 · 09-22-2017, 10:01 AM

Quote:

Originally Posted by arts711

Hi all,

Was wondering if anyone ever felt this while accelerating, very brief breaks in linearity of acceleration almost as if it slipped a bit or jerked a bit? If I floor it its not noticeable but if I slowly increase the throttle to floor, there'll be brief little breaks in acceleration as the revs climb. Maybe it could be power transferring to the different wheels, I don't know.

Also I noticed that sometimes around the parking lot the engine would rev itself up before grabbing the next gear

I have an auto m235ix so was wondering if this is something I should be concerned about. Any insight would be greatly appreciated!

Nope never.

XieJin · 09-28-2017, 09:02 AM

Quote:

Originally Posted by bryan_f22

sounds like misfires.

With your foot completely down, does it studder over 5k rpm?

What gas are you using? Are you tuned? What boost ?

i only run 98 RON and completely standard, no tune.

No jerking above 5k

bryan_G01 · 09-28-2017, 09:03 AM

how many miles on your spark plugs?

arts711 · 09-28-2017, 10:27 PM

Quote:

Originally Posted by bryan_f22

how many miles on your spark plugs?

Sorry for the delay, just trying to kinda pin point it down myself.

the car is stock (with MPE), 50ish k miles, sparks haven't been changed. Always on top tier premium, usually Shell V-power

The jerks are very subtle, I'm now wondering if its the X drive bit just shuffling power around as I can't seem to reproduce it.

Its not with foot completely down, only partial throttle.

bryan_G01 · 09-29-2017, 08:57 AM

time to change your plugs and probably coils if they haven't been.
at 50k, i'd personally change the fuel injectors and tranny fluid and differential fluids too.

zipphreak · 10-05-2017, 03:40 PM

Stock or aftermarket intake ??

XutvJet · 10-06-2017, 04:17 PM

Quote:

Originally Posted by bryan_f22

time to change your plugs and probably coils if they haven't been.
at 50k, i'd personally change the fuel injectors and tranny fluid and differential fluids too.

I guess I could see spark plugs, but injectors, coils, and fluids? I think not. This isn't an N54

OP - Do you notice this issue in all the driving modes?

Dylan86 · 10-06-2017, 05:16 PM

Quote:

Originally Posted by XutvJet

I guess I could see spark plugs, but injectors, coils, and fluids? I think not. This isn't an N54

OP - Do you notice this issue in all the driving modes?

Yea, that's some extreme preventative maintenance! I mean, no harm done, aside from a wallet flush..

09-14-2017, 11:34 AM	#1
arts711 Private First Class 27 Rep 111 Posts Drives: m235i Join Date: Sep 2014 Location: east coast iTrader: (0)	Gear slip or power issues? Maybe? Hi all, Was wondering if anyone ever felt this while accelerating, very brief breaks in linearity of acceleration almost as if it slipped a bit or jerked a bit? If I floor it its not noticeable but if I slowly increase the throttle to floor, there'll be brief little breaks in acceleration as the revs climb. Maybe it could be power transferring to the different wheels, I don't know. Also I noticed that sometimes around the parking lot the engine would rev itself up before grabbing the next gear I have an auto m235ix so was wondering if this is something I should be concerned about. Any insight would be greatly appreciated!
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09-14-2017, 09:50 PM	#3
amw896 Major 583 Rep 1,117 Posts Drives: 2015 BMW M235i Join Date: Feb 2016 Location: ontario iTrader: (0) Garage List 2015 BMW M235i [10.00]	Sounds like traction loss
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09-14-2017, 10:42 PM	#4
Shayan55 Captain 339 Rep 716 Posts Drives: F90 M5 Join Date: Jun 2016 Location: woodland hills CA iTrader: (1) Garage List 2105 BMW M235I [0.00]	are you sure that it isnt a slight misfire? i had experienced something like that in the audi i had prior to the 235 and it was a misfire try to replicate it and listen to the exhaust for hiccups __________________ (Sold) M235I Dinan intake, Active Autowerke FMIC, meisterschaft, TCKline coilovers, NT01's, BMS Oil cooler valve, VRSF DP&CP, BM3,StopTech Trophy BBK, Corbeau FX1 Pro seats, AP bar, Bimmerworld V3 Wing, APR Front splitter, Seibon Vented CF Hood 399.8whp on 91oct Hmu on Ig: @n55_shayan
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09-15-2017, 01:59 PM	#5
arts711 Private First Class 27 Rep 111 Posts Drives: m235i Join Date: Sep 2014 Location: east coast iTrader: (0)	Never had experience with that, I will see if I can replicate it more. Thanks for the tip.
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09-16-2017, 08:19 PM	#6
Smallm Old Member 56 Rep 94 Posts Drives: 2015 M235i, Dinan stage 4 Join Date: Jun 2015 Location: Sacramento iTrader: (0)	That little flare when shifting is an emissions thing to reduce the NOX emissions , it's part of the fuel maps in the ECM , I hate it !, I'd literally give my left nut to get rid of it.
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09-22-2017, 08:26 AM	#7
XieJin Private First Class 10 Rep 197 Posts Drives: '15 M235i xDrive Join Date: Jan 2011 Location: Sweden iTrader: (0)	I'm experiencing exactly the same symptoms. Slight jerking on 1st and 2nd gear when throttle is below 50%. I do not experience any issues in sport mode nor when accelerating heavily.... Also a M235i xDrive with auto trans
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09-22-2017, 09:53 AM	#8
bryan_G01 Lieutenant Colonel 1165 Rep 1,931 Posts Drives: like i stole it... Join Date: Jun 2012 Location: NY iTrader: (0)	sounds like misfires. With your foot completely down, does it studder over 5k rpm? What gas are you using? Are you tuned? What boost ? __________________ www.nybmwcca.org Current Cars: 1995 M3 Coupe Manual Alpine White 1997 M3 Sedan Auto Cosmo Black Metallic 2018 x3 m40 Auto Grey Metallic
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09-28-2017, 09:03 AM	#11
bryan_G01 Lieutenant Colonel 1165 Rep 1,931 Posts Drives: like i stole it... Join Date: Jun 2012 Location: NY iTrader: (0)	how many miles on your spark plugs? __________________ www.nybmwcca.org Current Cars: 1995 M3 Coupe Manual Alpine White 1997 M3 Sedan Auto Cosmo Black Metallic 2018 x3 m40 Auto Grey Metallic
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09-29-2017, 08:57 AM	#13
bryan_G01 Lieutenant Colonel 1165 Rep 1,931 Posts Drives: like i stole it... Join Date: Jun 2012 Location: NY iTrader: (0)	time to change your plugs and probably coils if they haven't been. at 50k, i'd personally change the fuel injectors and tranny fluid and differential fluids too. __________________ www.nybmwcca.org Current Cars: 1995 M3 Coupe Manual Alpine White 1997 M3 Sedan Auto Cosmo Black Metallic 2018 x3 m40 Auto Grey Metallic
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10-05-2017, 03:40 PM	#14
zipphreak Captain 454 Rep 986 Posts Drives: m235xi Join Date: Sep 2014 Location: b00ty iTrader: (2)	Stock or aftermarket intake ??
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