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Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 09-02-2008, 05:23 PM   #1
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Join Date: Jul 2008
Location: British Columbia, Canada
Posts: 8
My Ride: 2000 BMW 323i
Unhappy Engine or transmission troubles?

Oh boy. I wasn't expecting to have troubles this soon after buying my car. I own a 2000 BMW 323i with a 5-speed transmission. I bought it with 110,000 kilometres on it, and I've put on 5,000 so far. I've been recently encountering an extraordinarily frustrating issue while driving - and it's much more prevalent during more enthusiastic driving, as you might expect. My heart's starting to sink for this one because it feels like it might be a big wad of cash out of my pocket that I don't have. A little gut-churning and chest pressure because of that.

So, to get down to it;
firstly, when I downshift, the engine/transmission almost shudders as the RPM's rise to slow the car down. It's not like it's an intense jerking, but it's a subtle shudder that I'm not totally sure is typical or not.

And then my main and exasperatingly maddening problem (in story form because this is what happens most frequently): say I'm at a dead stop. I have to turn left and I need to be a little heavier on the pedal to get in the gap between traffic because it's rush hour. So going through first gear is fine, second gear is iffy but still okay, but third and fourth especially is when the problem begins to become blatantly apparent. The revs climb up as if I'm just slightly riding on the clutch by accident, keeping the engine and transmission only mostly engaged. So, the RPM's increase quite a bit between three and four thousand, but it doesn't feel as though it's actually pushing the car like it should be at those rotational speeds.

I know my explanation is a little longer than necessary but it's kind of hard for me to explain. It's like the gears aren't fully engaging, causing the RPM's to rise more than is actually being used to accelerate the car.

Any help would be incredibly appreciated. My friend seems to think my gears may be missing a few (or a bunch of) teeth, but I don't understand how, as I'm not exactly grinding my gears every time I shift. I'm actually fairly proud to say I'm very proficient with a manual transmission.

Anyway. Thanks infinitely in advance.

Last edited by andrewmacc; 09-02-2008 at 06:11 PM.
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Old 09-09-2008, 06:36 PM   #2
The R1 makes it fun
Join Date: Aug 2003
Location: SoCal
Posts: 1,453
My Ride: Yamaha R1 + 325i
In case you have not figured it out, this is textbook definition of a slipping clutch.
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