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///M3 Forum
The BMW E46 ///M3 is the M version E46 and puts out an amazing 333 HP and 262 lb-ft of torque at stock specs! There are an amazing amount of modifications for both the coupe and convertible models so read up and get started modifying your cars today!

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Old 03-21-2015, 08:33 PM   #1
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Join Date: May 2006
Location: Australia
Posts: 3
My Ride: E46 M3
Very Bizarre SMG Behaviour

Hey there Guys ! Just wondering if anyone can shed any light on this :

I have a 2002 smg m3 with 120k on it. The other day whilst driving very conservatively i proceeded to come to a stop and noticed the smg cog light came on the dash, I was sitting at the traffic lights at this point and went to accelerate and there was nothing, it was like the gear was not engaged at all, it was just revving away. It did not slip out of gear as the gear selector on the dash still said it was in 1st, I put it into 0 and then back into 1st, still nothing. i Sat there revving it and then all of a sudden the gearbox started thumping, rattling and jerking around and it jumped into gear like a gunshot with a bang, i then tryed to change into 2nd, nothing at all, started revving it a bit then all of a sudden a big knocking thumping and banging inside the gearbox again and a huge bang and then into second gear. I tryed turning the car off and on to reset the smg cog light but it did nothing, the cog light was staying on. The thumping, knocking noise appeared to be coming from underneath the centre console. I nursed my poor baby home in second gear turned her off and left her overnight. The next morning I go out and start it and it starts perfectly and drives perfectly. I pull out my driveway and drive about 10 kilometers and then the smg cog light comes on again and it does the same thing all over again. Any thoughts ? Anyone encountered anything like this ? The smg pump seems to be priming properly and sounds fine. Any help very extremely appreciated
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Old 03-22-2015, 02:11 AM   #2
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Join Date: Mar 2014
Location: San Diego
Posts: 448
My Ride: 2004 M3 Coupe
Get codes? That's the only way you can figure out the problem. My SMG use to do that but mine shifts to neutral after SES and Cog light turns on. Scary coz it happened a few times while on the freeway. So, decided to have my SMG converted to manual stick. :-)
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Old 03-22-2015, 09:51 AM   #3
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Join Date: Mar 2015
Location: Austin
Posts: 2
My Ride: E92 M3
Hey, I had a similar thing (in neutral while showing in gear) with mine but it did this with 4th gear. Unfortunately, I replaced the clutch and SMG pump and it still did the same thing. It got worse, clunking noises when downshifting..... Had to replace the transmission, not something that can be repaired (according to what I was told)
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Old 03-22-2015, 11:26 PM   #4
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Join Date: Oct 2012
Location: DUPONT, WA
Posts: 88
My Ride: 13 X3 AW/04 M3 AW
may be the compression springs down in the transmission. there are three springs that control the gears, 1-2, 3-4, 5-6. These springs have a tendency to break i guess. search it, may be your issue.
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Old 03-23-2015, 02:59 AM   #5
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Join Date: May 2006
Location: Australia
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My Ride: E46 M3
Thanks for the replys guys, I am getting the codes read in the morning so may know so little more.

I've read about the compression springs, might do them anyway for safety sake.

I have no weird clunking yet, fingers crossed . Only the normal clunk when shifting through gears.
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