X5 Lurches forward trying to idle forward after complete stop

Bengineer330 · 12-13-2022, 11:04 AM

Not sure if I have a transmission problem or a brake problem.

75% of the time whenever I am in D, come to a complete stop, and then let off the brake to idle forward the car lurches forward. The only way I can explain it is if you ever washed your car and your brake pads slightly rust to the rotor and it finally breaks free and lunges forward.

Does anyone know if the brakes hold during a complete stop? The same symptom happens when I use the 'AUTO H' feature but not sure what is used to hold.

No rough shifts or anything after the initial "lurch."

Any insight would be nice, just trying to figure out which parts I should try to replace first....Throwing money at this car is my only hobby

Colodano · 12-14-2022, 06:33 PM

Sounds like potentially a transmission issue, and the auto hold should hold the vehicle at a stop until you give it throttle to move forward.

Dekero · 12-15-2022, 03:03 PM

My first question would be what is your car set to for an idle speed? Is it too high perhaps?

Attacking Mid · 12-15-2022, 05:40 PM

Sounds to me like you may have a sticky caliper. Get it up on jack stands and go through the same motions of stopping all 4 wheels and see if one sticks when you let off.

AM.

tomjonesBT33 · 12-16-2022, 12:40 AM

I'd suggest resetting the adaptives in the transmission using INPA or ISTA/D.

Sophisticated Redneck · 12-17-2022, 06:28 PM

Had issue with mine, turned out to be funky solenoids in transmission preventing the torque converter lockup from fully disengaging. Replaced solendoids and resolved all the issues. Lots of kits out there now to do this. Recommend you pickup the ATSG manual if you tackle yourself. Not a bad job but you must be meticulous and get everything right when you bolt back in the valve body

Serf27 · 12-23-2022, 09:09 PM

Had a similar issue in my n54.
Come to a stop, slowly release brake pedal to take off and the car jumps forward!
It was the crank sensor.

12-13-2022, 11:04 AM	#1
Bengineer330 Private First Class 48 Rep 106 Posts Drives: Le Mans Blue 2011 E92 M3 Join Date: Oct 2014 Location: Genesee, WI iTrader: (1)	X5 Lurches forward trying to idle forward after complete stop Not sure if I have a transmission problem or a brake problem. 75% of the time whenever I am in D, come to a complete stop, and then let off the brake to idle forward the car lurches forward. The only way I can explain it is if you ever washed your car and your brake pads slightly rust to the rotor and it finally breaks free and lunges forward. Does anyone know if the brakes hold during a complete stop? The same symptom happens when I use the 'AUTO H' feature but not sure what is used to hold. No rough shifts or anything after the initial "lurch." Any insight would be nice, just trying to figure out which parts I should try to replace first....Throwing money at this car is my only hobby __________________ 2011 E70 Xdrive50i M-Sport Black 2011 E92 M3 ZCP LeMans Blue 2006 E90 330i Silver - Donated after 410,000 miles
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12-14-2022, 06:33 PM	#2
Colodano First Lieutenant 137 Rep 317 Posts Drives: 2010 X5M Join Date: Oct 2017 Location: Co iTrader: (0)	Sounds like potentially a transmission issue, and the auto hold should hold the vehicle at a stop until you give it throttle to move forward.
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12-15-2022, 03:03 PM	#3
Dekero Private First Class 40 Rep 114 Posts Drives: 2013 BMW X5 35I Join Date: Mar 2021 Location: Memphis TN iTrader: (0)	My first question would be what is your car set to for an idle speed? Is it too high perhaps?
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12-15-2022, 05:40 PM	#4
Attacking Mid Private 32 Rep 61 Posts Drives: e46, e53, e83, e70 Join Date: Feb 2019 Location: Colorado iTrader: (0)	Sounds to me like you may have a sticky caliper. Get it up on jack stands and go through the same motions of stopping all 4 wheels and see if one sticks when you let off. AM.
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12-16-2022, 12:40 AM	#5
tomjonesBT33 Second Lieutenant 180 Rep 270 Posts Drives: 2006 Z4 M Roadster Join Date: Oct 2019 Location: VA iTrader: (0) Garage List 2012 BMW X5M [0.00] 2006 BMW Z4 M Roadster [0.00]	I'd suggest resetting the adaptives in the transmission using INPA or ISTA/D. __________________ 2006 Z4 M Roadster - Silver Grey Metallic 2011 X3 xDrive28i - Deep Sea Blue Metallic 2012 X5 M - Monte Carlo Blue Metallic 2017 X1 xDrive28i - Alpine White
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12-17-2022, 06:28 PM	#6
Sophisticated Redneck Lieutenant Colonel 1439 Rep 1,564 Posts Drives: 2012 BMW X5 50i Join Date: Jul 2018 Location: CA iTrader: (0)	Had issue with mine, turned out to be funky solenoids in transmission preventing the torque converter lockup from fully disengaging. Replaced solendoids and resolved all the issues. Lots of kits out there now to do this. Recommend you pickup the ATSG manual if you tackle yourself. Not a bad job but you must be meticulous and get everything right when you bolt back in the valve body
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12-23-2022, 09:09 PM	#7
Serf27 Brigadier General 2877 Rep 4,332 Posts Drives: 335i Join Date: Apr 2018 Location: Sitting in a BMW. iTrader: (-1)	Had a similar issue in my n54. Come to a stop, slowly release brake pedal to take off and the car jumps forward! It was the crank sensor.
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