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E46 Xi Forum
The E46 XI was produced from 01-05 in sedan and touring body styles. Powered by either a 2.5L inline 6 in the 325xi or a 3.0L inline 6 330xi. Discuss all thing about BMW AWD E46 'Xi' here.

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Old 07-03-2011, 01:57 PM   #1
djbradle
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Join Date: Dec 2008
Location: Central Ma
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My Ride: 2002 325 xit
Is the torque converter always engaged?

Anyone have experience with their torque converter engaging automatically when shifting to drive or reverse on their xi's?
I've been tracking a vibration issue during D and R at idle that was subsequently reduced by replacing both front engine mounts. After studying the shifts during idle I noticed that the transmission thumps fairly strong and then vibration begins as if the converter has already engaged though I thought it should only engage when throttle and forward motion is gained at a certain rpm range.
I pretty much have off the line response from drive and revers with absolutely zero delay. Think my TC solenoid is gone and the dme is causing a safe mode to occur for driving?
I'm just about to do some fluid changes for both diffs and the transmission soon and would do the solenoid if need be. I don't have any software for voltage checks on the solenoids at this moment.

Last edited by djbradle; 07-07-2011 at 08:19 PM.
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Old 07-04-2011, 04:13 PM   #2
djbradle
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60 views, no answer?
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Old 07-05-2011, 05:17 PM   #3
djbradle
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Old 07-09-2011, 01:39 PM   #4
sidct
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Torque converter is connected (bolted) to the crankshaft via flex plate or flywheel hence is always engaged. You probably are referring to torque converter clutch (TCC).
You can read up on basics of TC here: http://en.wikipedia.org/wiki/Torque_converter.
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Old 07-30-2011, 05:42 PM   #5
djbradle
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Yes, my bad. I mean the torque converter clutch (TCC).
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