Auto Trans "Hunting" in 4th and 5th

gobbell1 · 11-15-2012, 08:42 AM

I have a 2006 330i with auto trans that...

1. While in "D", works just fine. Shifts smoothly, dashboard and console lights are correct.

2. While in "DS" mode, it will "hunt" for the right gear in 4th gear, going from 4th to 5th back to 4th etc.. This "hunting" only occurs while in 4th AND under a smooth load (i.e. constant throttle - not gunning it). The dasboard and console lights correctly state "DS" and "M/S" respectively. I've also opened the console and did not find any broken wires (but maybe I missed one).

Let me be clear, this issue is different from "DS mode not working - broken wire" issues, where the dashboard will change from "DS" to "D". My dash stays correctly lit, just the tranny hunts for the right gear.

Anybody else have this issue? Any clues?

gobbell1 · 11-19-2012, 10:20 PM

***UPDATE***

I've noticed since my last post, that when in "DS" mode, my trans will upshift on its own.

Its not supposed to do that is?

idrift4wd · 11-19-2012, 11:54 PM

well how much are you pressing the accelerator?

fravel · 11-20-2012, 08:48 AM

Quote:

Originally Posted by gobbell1

***UPDATE***

I've noticed since my last post, that when in "DS" mode, my trans will upshift on its own.

Its not supposed to do that is?

I believe that is normal operation. The DS acts as an in-between of the D and M/S modes, giving the sportier operation of M/S mode without requiring the driver to consciously shift.

gobbell1 · 11-21-2012, 06:15 PM

thanks for the posts guys, but this phenomenon just started about a month ago.

idrft4wd: I'm just holding the accelerator steady, neither letting off or adding pressure.

11-15-2012, 08:42 AM	#1
gobbell1 Private 14 Rep 58 Posts Drives: 2009 Z4 30Si Join Date: May 2012 Location: Memphis, TN iTrader: (0)	Auto Trans "Hunting" in 4th and 5th I have a 2006 330i with auto trans that... 1. While in "D", works just fine. Shifts smoothly, dashboard and console lights are correct. 2. While in "DS" mode, it will "hunt" for the right gear in 4th gear, going from 4th to 5th back to 4th etc.. This "hunting" only occurs while in 4th AND under a smooth load (i.e. constant throttle - not gunning it). The dasboard and console lights correctly state "DS" and "M/S" respectively. I've also opened the console and did not find any broken wires (but maybe I missed one). Let me be clear, this issue is different from "DS mode not working - broken wire" issues, where the dashboard will change from "DS" to "D". My dash stays correctly lit, just the tranny hunts for the right gear. Anybody else have this issue? Any clues?
	Appreciate 0 Tweet Quote

11-19-2012, 10:20 PM	#2
gobbell1 Private 14 Rep 58 Posts Drives: 2009 Z4 30Si Join Date: May 2012 Location: Memphis, TN iTrader: (0)	*UPDATE* I've noticed since my last post, that when in "DS" mode, my trans will upshift on its own. Its not supposed to do that is?
	Appreciate 0 Quote

11-19-2012, 11:54 PM	#3
idrift4wd Brigadier General 149 Rep 3,552 Posts Drives: Three Hundred and Thirty Five Join Date: Jul 2010 Location: Yonkers NY iTrader: (0) Garage List 2007 BMW [7.00]	well how much are you pressing the accelerator?
	Appreciate 0 Quote

11-21-2012, 06:15 PM	#5
gobbell1 Private 14 Rep 58 Posts Drives: 2009 Z4 30Si Join Date: May 2012 Location: Memphis, TN iTrader: (0)	thanks for the posts guys, but this phenomenon just started about a month ago. idrft4wd: I'm just holding the accelerator steady, neither letting off or adding pressure.
	Appreciate 0 Quote