stepstronic lunging - BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i)

blklacker · 04-29-2008, 01:20 PM

135i build 3/06/2008 seattle 628miles... Car is not broken in yet I have been taken a easy on it.

Problem: Frequently but not all the time on a dead stop ie (redlight) when I realease the brake before I apply throttle, I feel the car lunge quickly in a jerky way. Could this possibly be a crankshaft issue... or maybe my brakes are just tight. Would you take it to the dealership to have them take a look. What are your thoughts.

Your input would be very apperciated guys thanks.

shawshank772 · 04-29-2008, 01:46 PM

Its probably the break assist. I know there is a fix for it from the BMW dealership. THey have some new flash to throw into the ECU to stop it from what I have read on e90 post.

gregthegr8 · 04-29-2008, 01:49 PM

I'm having that to some degree as well. Let me know what you guys find out and I'll be more aware of it in the next day driving to/from work.

blklacker · 04-29-2008, 02:00 PM

Quote:

Originally Posted by 5soko

this lunging forward is similar to what i and many other 335i owners have had experience with.

when i come to a stop sign sometimes and get on the throttle again, it 'JERKS' forward hard and right away becomes smooth again.

can this be similar to what you are describing.

or what you may be describing is the Brake assist?

Sometimes it happends without applying throttle I feel a slight quick jerk, but most of when it happens im applying modest throttle Its a quick more noticable (jerk) then its smooth. Im going to the dealership today to talk to a tech and I will pass On any information to you guys.

??Is their a way to disable brake assit???

gregthegr8 · 04-29-2008, 02:59 PM

I find that jerking to be juuuust as I start to go, then after 1/2 a second, it's smooth, but I think it's something I will get used to, using the proper throttle amount to get it to start going. it's almost that the turbo kicks in at that 1400 rpm and then we're off and moving. what do i know though. only had it for 3 days.

blklacker · 04-29-2008, 08:43 PM

Confirmed with Seattle BMW Foreman, The lunging is just part of the BMW design they have no fix for it, its inherent from previous models. He stated you should only feel the lunge when your stopped on a slight downgrade Its very minor IMO. It should not happen on a incline or flat terrain. It shouldn't happen often but if it does its just how it is (assist brake). I didn't like his answer but honestly I only have two grips about this car, 1 being the lunge issue and the other is the cup holder location.

I have driven alot of different cars in my life time and I have to say for the price point it doesn't get any better than the E82

imported_Maurice · 05-01-2008, 12:48 PM

I agree with GregtheGr8. I have the step in my 135, and I have to just feather the throttle as I take off or I get a lunge. The other way to avoid it is to bury the throttle when you take off. :biggrin:

F0Bman · 05-02-2008, 12:31 AM

Sounds like you should take it into the dealer.

gregthegr8 · 05-02-2008, 01:24 AM

I don't know that there's necessarily something wrong with it, I think it's just learning the engine and getting used to how it works. I'm getting better and smoother at it. It is weird though, it seems to not want to go for that first few millimeters I push the gas down, then the next few it just zips along and in a couple of seconds i'm over the speed limit. You know, I just got back from a long, winding drive on the empty freeways of LA and this car is just so smooth and such a pleasure to drive. Also got my mpg over 20 now. =D

Robert · 05-02-2008, 02:24 AM

Another TiAG in LA

gregthegr8 · 05-02-2008, 02:25 AM

What can I say Robert, we have good taste.

04-29-2008, 01:20 PM	#1
blklacker Captain Drives: 135i Join Date: Apr 2008 Location: seattle Posts: 655 iTrader: (0)	stepstronic lunging 135i build 3/06/2008 seattle 628miles... Car is not broken in yet I have been taken a easy on it. Problem: Frequently but not all the time on a dead stop ie (redlight) when I realease the brake before I apply throttle, I feel the car lunge quickly in a jerky way. Could this possibly be a crankshaft issue... or maybe my brakes are just tight. Would you take it to the dealership to have them take a look. What are your thoughts. Your input would be very apperciated guys thanks. __________________ -135i BSM, CRBL ,custom front lip/Indianapolis red fade, blacked out tail lights/corner headlights, golf tee, BMS Air intake, SSTT, CF spoiler,Powdered coated OEM rims gunmetal high gloss,custom Rear diffuser Black/Indianapolis red fade
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04-29-2008, 08:43 PM	#6
blklacker Captain Drives: 135i Join Date: Apr 2008 Location: seattle Posts: 655 iTrader: (0)	the skinny Confirmed with Seattle BMW Foreman, The lunging is just part of the BMW design they have no fix for it, its inherent from previous models. He stated you should only feel the lunge when your stopped on a slight downgrade Its very minor IMO. It should not happen on a incline or flat terrain. It shouldn't happen often but if it does its just how it is (assist brake). I didn't like his answer but honestly I only have two grips about this car, 1 being the lunge issue and the other is the cup holder location. I have driven alot of different cars in my life time and I have to say for the price point it doesn't get any better than the E82 __________________ -135i BSM, CRBL ,custom front lip/Indianapolis red fade, blacked out tail lights/corner headlights, golf tee, BMS Air intake, SSTT, CF spoiler,Powdered coated OEM rims gunmetal high gloss,custom Rear diffuser Black/Indianapolis red fade

05-02-2008, 12:31 AM	#8
F0Bman First Lieutenant Drives: Join Date: Apr 2008 Posts: 309 iTrader: (0)	Sounds like you should take it into the dealer. __________________ Fully Restored 1985 Corolla GT-S 1987 328ci SR20DET Drift Car 1989 Honda Civic Si-R Current Project 2002 Corolla CE Daily Driver www.TheTunerSource.com

05-02-2008, 02:24 AM	#10
Robert Major General Drives: 135i, current is350 Join Date: Aug 2005 Location: Socal Posts: 6,768 iTrader: (1)	Another TiAG in LA __________________ - There's nothing in my pocket other than knives and lint

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04-29-2008, 01:46 PM	#2
shawshank772 Captain Drives: 135i Join Date: Aug 2007 Location: Chicago Posts: 878 iTrader: (1)	Its probably the break assist. I know there is a fix for it from the BMW dealership. THey have some new flash to throw into the ECU to stop it from what I have read on e90 post.

04-29-2008, 01:49 PM	#3
gregthegr8 Captain Drives: 2013 Mineral Grey 135is Join Date: Jan 2008 Location: Los Angeles, CA Posts: 709 iTrader: (1)	I'm having that to some degree as well. Let me know what you guys find out and I'll be more aware of it in the next day driving to/from work.

04-29-2008, 02:59 PM	#5
gregthegr8 Captain Drives: 2013 Mineral Grey 135is Join Date: Jan 2008 Location: Los Angeles, CA Posts: 709 iTrader: (1)	I find that jerking to be juuuust as I start to go, then after 1/2 a second, it's smooth, but I think it's something I will get used to, using the proper throttle amount to get it to start going. it's almost that the turbo kicks in at that 1400 rpm and then we're off and moving. what do i know though. only had it for 3 days.

05-01-2008, 12:48 PM	#7
imported_Maurice Not too sexy for his car. Drives: Join Date: Jan 2008 Posts: 113 iTrader: (0)	I agree with GregtheGr8. I have the step in my 135, and I have to just feather the throttle as I take off or I get a lunge. The other way to avoid it is to bury the throttle when you take off. :biggrin:

05-02-2008, 01:24 AM	#9
gregthegr8 Captain Drives: 2013 Mineral Grey 135is Join Date: Jan 2008 Location: Los Angeles, CA Posts: 709 iTrader: (1)	I don't know that there's necessarily something wrong with it, I think it's just learning the engine and getting used to how it works. I'm getting better and smoother at it. It is weird though, it seems to not want to go for that first few millimeters I push the gas down, then the next few it just zips along and in a couple of seconds i'm over the speed limit. You know, I just got back from a long, winding drive on the empty freeways of LA and this car is just so smooth and such a pleasure to drive. Also got my mpg over 20 now. =D

05-02-2008, 02:25 AM	#11
gregthegr8 Captain Drives: 2013 Mineral Grey 135is Join Date: Jan 2008 Location: Los Angeles, CA Posts: 709 iTrader: (1)	What can I say Robert, we have good taste.