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E90/E91/E92/E93 (2006 - 2013)
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Old 03-01-2013, 01:42 PM
gryphon328i gryphon328i is offline
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Mein Auto: 2009 BMW 328i
'09 328i - Advice - Transmission "slipping"

I have a 2009 328i sedan with a manual transmission. I'm at 180,000 km (~111k miles). Nearly all highway driving.

Very recently I started noticing that in 3rd, 4th, 5th and 6th the transmission is slipping. When I'm in gear and between 2000-3000 rpm if I push the gas down with any force the transmission "slips" or "bucks". When I'm at low rpms I have to accelerate slowly to avoid this happening. It very rarely does this in 2nd and never in 1st. Its been getting worse for a couple weeks now.

I gear down religiously and suspect this could have contributed to the wear on the gears....thoughts?

I'm not mechanically inclined but suspect either my transmission or clutch is in need of repair/replacement.

Any help is appreciated.
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Old 03-01-2013, 04:42 PM
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fun2drive fun2drive is offline
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Mein Auto: 335 vert//M3/4/ 13Outback
Gears don't slip thus your clutch is going south...
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Old 03-01-2013, 05:06 PM
Pilgrim Pilgrim is offline
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If you're gearing down to slow down, you'd better learn how to double-clutch and heel and toe, or you will increase clutch wear. Matching engine speed to gearing makes a big difference in the friction generated when you increase the clutch.

What's slipping is the clutch. Transmissions don't slip.
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Last edited by Pilgrim; 03-01-2013 at 05:10 PM.
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Old 03-01-2013, 06:01 PM
BashedBarrique BashedBarrique is offline
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Quote:
Originally Posted by Pilgrim View Post
If you're gearing down to slow down, you'd better learn how to double-clutch and heel and toe, or you will increase clutch wear. Matching engine speed to gearing makes a big difference in the friction generated when you increase the clutch.

What's slipping is the clutch. Transmissions don't slip.
Well manual ones don't anyway.

Down shifting, even without heel and toeing, shouldn't significantly increase clutch wear. So long as you aren't using the clutch surface for braking by slipping it as you engage the lower gears.

I rarely heel and toe when merely coming up to a stop light or stop sign. It pretty much defeats the whole purpose of downshifting, if being done to utilize engine braking, if you increase engine revs before changing to a lower gear.
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Old 03-01-2013, 06:54 PM
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CALWATERBOY CALWATERBOY is offline
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Mein Auto: 2009 E93 N54
Quote:
Originally Posted by gryphon328i View Post
IVery recently I started noticing that in 3rd, 4th, 5th and 6th the transmission is slipping. When I'm in gear and between 2000-3000 rpm if I push the gas down with any force the transmission "slips" or "bucks". When I'm at low rpms I have to accelerate slowly to avoid this happening. It very rarely does this in 2nd and never in 1st. Its been getting worse for a couple weeks now.

You must read these important pages....proceed accordingly.
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