jumpy revs, help!

jetblk328i · 07-20-2009, 02:17 PM

Hey guys, i've had this problem for a while and i don't know what exactly to tell the dealership. My technical car jargon is not very good haha.

Anyways, I think theres an issue with my transmission or just the gauges.

Once i get going, 50+ miles an hour and i accelerate, my revs drop ever so slightly, a little less than a centimeters worth. Then after 2 seconds or so there, it then climbs up back to where it was and continues on its way as i continue accelerating.

Meanwhile, the car is accelerating the whole time, I do not feel it accelerate any more than it did before, after the revs actually start climbing.

This happens all the time, i have done this at various speeds and it usually does it speeds over 50.

This is a Steptronic car and this occurs on D. I have not tried it on DS.

Anyone know what this is? I have a 2007 328i with step so i dont know if you other guys with the same car have this as well.

Any input is appreciated!

Thanks!!!

Wires · 07-20-2009, 04:06 PM

Could be the torque converter locking/unlocking? That will change the revs by 10%.

jetblk328i · 07-20-2009, 08:42 PM

I'd Like to add that sometimes, at lower speeds as well as higher speeds, when i accelerate hard, the revs would go up a bit, maybe .25K then back down to where it was then resume the climb normally.

jetblk328i · 07-21-2009, 08:32 PM

bump

MotoMojo · 07-21-2009, 08:47 PM

Quote:

Originally Posted by jetblk328i

My technical car jargon is not very good haha.

Sounds like your muffler bearing's out.

07-20-2009, 02:17 PM	#1
jetblk328i Colonel 309 Rep 2,458 Posts Drives: X3 M40i Join Date: Mar 2007 Location: Central PA iTrader: (1)	jumpy revs, help! Hey guys, i've had this problem for a while and i don't know what exactly to tell the dealership. My technical car jargon is not very good haha. Anyways, I think theres an issue with my transmission or just the gauges. Once i get going, 50+ miles an hour and i accelerate, my revs drop ever so slightly, a little less than a centimeters worth. Then after 2 seconds or so there, it then climbs up back to where it was and continues on its way as i continue accelerating. Meanwhile, the car is accelerating the whole time, I do not feel it accelerate any more than it did before, after the revs actually start climbing. This happens all the time, i have done this at various speeds and it usually does it speeds over 50. This is a Steptronic car and this occurs on D. I have not tried it on DS. Anyone know what this is? I have a 2007 328i with step so i dont know if you other guys with the same car have this as well. Any input is appreciated! Thanks!!!
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07-20-2009, 04:06 PM	#2
Wires Brigadier General 1658 Rep 4,891 Posts Drives: 2016 340i xDrive Join Date: Apr 2008 Location: Calgary iTrader: (0)	Could be the torque converter locking/unlocking? That will change the revs by 10%.
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07-20-2009, 08:42 PM	#3
jetblk328i Colonel 309 Rep 2,458 Posts Drives: X3 M40i Join Date: Mar 2007 Location: Central PA iTrader: (1)	I'd Like to add that sometimes, at lower speeds as well as higher speeds, when i accelerate hard, the revs would go up a bit, maybe .25K then back down to where it was then resume the climb normally.
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07-21-2009, 08:32 PM	#4
jetblk328i Colonel 309 Rep 2,458 Posts Drives: X3 M40i Join Date: Mar 2007 Location: Central PA iTrader: (1)	bump
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