2007 4.8 X5 Lunging Problems

[ard]

"jerks"?

One classic symptom is when coming to a stop the engine/transmission is still engaged and is still driving the car forward as you brake- then the transmission disengages abruptly causing a pronounced 'stop' since you've been braking hard to counter the forward drive. This kind of jerk is a symptom of the trans not releasing- an issue with the lock up torque converter, or associated sensors actuators.

Being able to PRECISELY describe the 'jerk' would be of benefit when asking here or taking it to a mechanic....

[X5ists]

Originally Posted by ard

"jerks"?

One classic symptom is when coming to a stop the engine/transmission is still engaged and is still driving the car forward as you brake- then the transmission disengages abruptly causing a pronounced 'stop' since you've been braking hard to counter the forward drive. This kind of jerk is a symptom of the trans not releasing- an issue with the lock up torque converter, or associated sensors actuators.

Being able to PRECISELY describe the 'jerk' would be of benefit when asking here or taking it to a mechanic....

Will the software update will solve the problem? Talked the dealer yesterday, needs to bring it in for diagnostic and update if there is an update for my transmission for $219.....they need the X for the whole day.

"trans not releasing- an issue with the lock up torque converter, or associated sensors actuators." is it an expensive fix??

[jharms]

These things are crap! In addition to the jerkiness from start, the dealer quoted $7000 to fix all of the oil leaks. That's after throwing $2000 away to pay to get oil leaks fixed, only to still have oil spots on the garage floor.

Power seats broke under warranty too, but the dealer wouldn't fix. The X5 is just garbage!

[ard]

Originally Posted by X5ists

Will the software update will solve the problem? Talked the dealer yesterday, needs to bring it in for diagnostic and update if there is an update for my transmission for $219.....they need the X for the whole day.

"trans not releasing- an issue with the lock up torque converter, or associated sensors actuators." is it an expensive fix??

Is your car under warranty?

[X5ists]

Originally Posted by ard

Is your car under warranty?

Nope....but it used

[ard]

Originally Posted by X5ists

Will the software update will solve the problem? Talked the dealer yesterday, needs to bring it in for diagnostic and update if there is an update for my transmission for $219.....they need the X for the whole day.

"trans not releasing- an issue with the lock up torque converter, or associated sensors actuators." is it an expensive fix??

Probably worth $219 to maybe fix it.... but anything inside the transmission is $$$$$$ with a BMW dealer.

[BMWjason]

FYI, The jerking is caused from using low octane fuel. This engine is nearly 11:1 compression. The knock sensors are very sensitive. This engine needs octane. I have run this motor on 30% E85 and regular unleaded equivalent 95 octane. It will wow you. I only recommend E85 in dry desert climates. The minimum octane for this motor is 91, and that is still lacking.