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E90/E91/E92/E93 (2006 - 2013)
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  #1  
Old 08-31-2013, 05:11 PM
Landshark 328 Landshark 328 is offline
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Slipping backwards in park (stick)

Hey guys, just upgraded to a 335i Msport with 26k miles. Loving it but have noticed one strange thing in the first week.

When parking on a hill and leaving it in first (its a manual) the car slips backwards. Once the car is off and left in gear it slips backwards about 3-4 inches. Then in 5 seconds or so it slips a few inches again. It has a perfect rhythm to the movement (slip-pause-slip-pause-slip ...)

Does anyone else have this issue or know what causes it?
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Last edited by Landshark 328; 08-31-2013 at 05:25 PM.
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  #2  
Old 08-31-2013, 05:44 PM
roadkillrob roadkillrob is offline
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It can really only be 2 things since leaving it in first is just locking the wheels to the engine, so either the clutch is slipping or the engine is actually turning over. If the engine is turning over, then either the hill is extremely steep causing enough force to overcome compression, or the car is leaking compression past the valves slowly allowing the engine to turn over a little and the car can move.
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Old 08-31-2013, 06:48 PM
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Quote:
Originally Posted by roadkillrob View Post
It can really only be 2 things since leaving it in first is just locking the wheels to the engine, so either the clutch is slipping or the engine is actually turning over.
This. A slipping clutch would result in a steadier roll. Also, very unlikely at only 26k miles.

OP: Did you notice that leather-wrapped lever with a button on the end, behind and to the left of the gearshift? Ever wonder about its purpose? (Hint: Ignoring it is the cause. )
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Old 08-31-2013, 07:15 PM
roadkillrob roadkillrob is offline
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Originally Posted by Zeichen311 View Post

OP: Did you notice that leather-wrapped lever with a button on the end, behind and to the left of the gearshift? Ever wonder about its purpose? (Hint: Ignoring it is the cause. )
Yes, leaving a car in gear should not be considered safe without the parking brake on!
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Old 08-31-2013, 09:06 PM
Pilgrim Pilgrim is offline
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There is this mysterious and semi-mythical device called a "Parking Brake".

We can only speculate as to its functions, but some of the wilder theories suggest that it might have once been used while a vehicle is parked.
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Old 08-31-2013, 10:23 PM
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Slipping backwards in park (stick)

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Old 09-01-2013, 06:51 PM
Landshark 328 Landshark 328 is offline
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In my truck I can always leave it in gear and it wouldn't go anywhere.

It was still moving with the ebrake on. I might have to rebuild the ebrake over time
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Old 09-01-2013, 07:19 PM
TXFred TXFred is offline
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This may help.

http://www.m3post.com/forums/showthread.php?t=453084
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Old 09-02-2013, 08:45 AM
Pilgrim Pilgrim is offline
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Quote:
Originally Posted by Landshark 328 View Post
In my truck I can always leave it in gear and it wouldn't go anywhere.

It was still moving with the ebrake on. I might have to rebuild the ebrake over time
Dang! That's not good. Time to get that parking brake (no longer called an "emergency brake", although I get where you're coming from) snugged up and working.

Seriously, every drivetrain has some slack, and when parking a stick transmission in gear, it's normal for the car to be able to move a bit. if you're on a hill, you always select low or re verse, and turn tires so they contact the curb - which also implies that you're a competent driver and can park within a foot of the curb or less.
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