M3 jerks forwards cold start

Mike1992 · 06-19-2019, 02:12 AM

Hey fellas
Just this morning I go to turn on my car (cold start) I let it sit for a little over 2 minutes and I go push on the gas the car jerks forward this is a dct model I turned the car off and started again the problem went away any ideas what it can be ?

2011 m3 e92 88k miles

amrazM · 06-19-2019, 03:15 AM

Was it in gear or no?

Mike1992 · 06-19-2019, 03:16 AM

Ya

Mike1992 · 06-19-2019, 11:46 AM

Anyone ?

///M Power-Belgium · 06-19-2019, 12:41 PM

Quote:

Originally Posted by Mike1992

Anyone ?

Bad gas .

Mike1992 · 06-19-2019, 12:49 PM

I always fill 91 and it was driving fine the last 2 days same gas

8500RPM · 06-19-2019, 01:34 PM

These cars are know at times when cold to jerk in low gear. Happens to me 2012 6speed sometimes. Goes away after I let off and slowly get back into it.

pbonsalb · 06-19-2019, 01:48 PM

My car is often jerky on a cold cold start. 08 manual trans. If I let it warm up for a minute or 2 before driving, it is smooth.

Mike1992 · 06-19-2019, 02:05 PM

Has it ever lunged forward when lightly stepping on gas?

wfdeacon88 · 06-19-2019, 02:14 PM

Quote:

Originally Posted by Mike1992

Has it ever lunged forward when lightly stepping on gas?

I wouldn't be too concerned about this .. cold start sequence and subsequent driving right after is a little finicky often. I believe it's best to start driving right after the revs normalize down lower towards 500 RPM...

dakarwu · 06-19-2019, 04:26 PM

Not sure this is related but most of the time when I go from D2 to D3 at a stop light I feel the car do a small jerk even though I'm on the brakes

Icecreamfoo · 06-19-2019, 05:42 PM

Quote:

Originally Posted by Mike1992

Hey fellas
Just this morning I go to turn on my car (cold start) I let it sit for a little over 2 minutes and I go push on the gas the car jerks forward this is a dct model I turned the car off and started again the problem went away any ideas what it can be ?

2011 m3 e92 88k miles

Assuming you are a new owner to a "seasoned" E92, like everyone said, pretty common behavior during the cold start cycle with all the extra air rushing into the engine

What I found was after replacing the throttle body actuators on my aged car (mine had not outright failed/causing error codes), the jerkiness during cold start was much less pronounced

M43S7RO · 06-19-2019, 05:53 PM

Check the fluid level. I'd be surprised if every single dct doesn't leak and most owners have no clue.

Mike1992 · 06-19-2019, 06:36 PM

The dct has a very minor leak I have to take care of

amrazM · 06-19-2019, 10:33 PM

Quote:

Originally Posted by dakarwu

Not sure this is related but most of the time when I go from D2 to D3 at a stop light I feel the car do a small jerk even though I'm on the brakes

This is the car shifting into first.

aussiem3 · 06-20-2019, 12:34 AM

Pretty normal behaviour and I've noticed it's more pronounced when the car hasn't been driven for a couple of days. It's like the air has come out of the airbox during this time. I was concerned initially but now cannot be bothered. I've had the car since new - Sept '07 build.

Mike1992 · 06-20-2019, 01:15 AM

Quote:

Originally Posted by aussiem3

Pretty normal behaviour and I've noticed it's more pronounced when the car hasn't been driven for a couple of days. It's like the air has come out of the airbox during this time. I was concerned initially but now cannot be bothered. I've had the car since new - Sept '07 build.

Oh wow that’s a relief

06-19-2019, 02:12 AM	#1
Mike1992 Enlisted Member 6 Rep 37 Posts Drives: 2011 Bmw m3 Join Date: Jun 2019 Location: North Hollywood iTrader: (0)	M3 jerks forwards cold start Hey fellas Just this morning I go to turn on my car (cold start) I let it sit for a little over 2 minutes and I go push on the gas the car jerks forward this is a dct model I turned the car off and started again the problem went away any ideas what it can be ? 2011 m3 e92 88k miles
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06-19-2019, 03:15 AM	#2
amrazM mTekMods 2139 Rep 2,899 Posts Drives: like a granny. Join Date: Jan 2010 Location: Manhatan iTrader: (1)	Was it in gear or no?
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06-19-2019, 03:16 AM	#3
Mike1992 Enlisted Member 6 Rep 37 Posts Drives: 2011 Bmw m3 Join Date: Jun 2019 Location: North Hollywood iTrader: (0)	Ya
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06-19-2019, 11:46 AM	#4
Mike1992 Enlisted Member 6 Rep 37 Posts Drives: 2011 Bmw m3 Join Date: Jun 2019 Location: North Hollywood iTrader: (0)	Anyone ?
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06-19-2019, 12:49 PM	#6
Mike1992 Enlisted Member 6 Rep 37 Posts Drives: 2011 Bmw m3 Join Date: Jun 2019 Location: North Hollywood iTrader: (0)	I always fill 91 and it was driving fine the last 2 days same gas
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06-19-2019, 01:34 PM	#7
8500RPM First Lieutenant 152 Rep 303 Posts Drives: 2012 M3 CP Join Date: Dec 2017 Location: Ft. Lauderdale, FL iTrader: (0)	These cars are know at times when cold to jerk in low gear. Happens to me 2012 6speed sometimes. Goes away after I let off and slowly get back into it.
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06-19-2019, 01:48 PM	#8
pbonsalb Lieutenant General 5228 Rep 10,614 Posts Drives: 18 F90 M5, 99 E36 M3 Turbo Join Date: Feb 2011 Location: New England iTrader: (4)	My car is often jerky on a cold cold start. 08 manual trans. If I let it warm up for a minute or 2 before driving, it is smooth.
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06-19-2019, 02:05 PM	#9
Mike1992 Enlisted Member 6 Rep 37 Posts Drives: 2011 Bmw m3 Join Date: Jun 2019 Location: North Hollywood iTrader: (0)	Has it ever lunged forward when lightly stepping on gas?
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06-19-2019, 04:26 PM	#11
dakarwu Private First Class 49 Rep 119 Posts Drives: Dakar Yellow E92 M3 Join Date: May 2014 Location: Los Angeles iTrader: (0)	Not sure this is related but most of the time when I go from D2 to D3 at a stop light I feel the car do a small jerk even though I'm on the brakes
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06-19-2019, 05:53 PM	#13
M43S7RO Major 503 Rep 1,055 Posts Drives: Jerez Black E92 M3 Join Date: Sep 2015 Location: Peoria, AZ iTrader: (13)	Check the fluid level. I'd be surprised if every single dct doesn't leak and most owners have no clue.
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06-19-2019, 06:36 PM	#14
Mike1992 Enlisted Member 6 Rep 37 Posts Drives: 2011 Bmw m3 Join Date: Jun 2019 Location: North Hollywood iTrader: (0)	The dct has a very minor leak I have to take care of
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06-20-2019, 12:34 AM	#16
aussiem3 Colonel 274 Rep 2,664 Posts Drives: Goggomobil Join Date: Jul 2007 Location: Kangaroo land iTrader: (1) Garage List 2017 BMW X6/// F86 [0.00]	Pretty normal behaviour and I've noticed it's more pronounced when the car hasn't been driven for a couple of days. It's like the air has come out of the airbox during this time. I was concerned initially but now cannot be bothered. I've had the car since new - Sept '07 build. __________________ F86 X6///
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