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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Wed, Feb-08-2017, 03:50:07 AM   #21
titaniummm
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Default Re: E46 M3 6MT intermittently won’t go into gear

Quote:
are there specific gears that have trouble and some that work consistently?
Thanks for the reply.

95% of the shifts are fine and no it doesn't seem to be specific gears except that the most likely problem gear is reverse.

Also, when it doesn't go into a gear, the gears aren't grinding, it's as if there is a new hard stop before the shift lever goes far enough.

Who is Kaiv and what would it cost to have the SMG swapped in?

Thanks.

--titaniummm
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Old Wed, Feb-08-2017, 04:34:50 AM   #22
ddaniel1
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Default Re: E46 M3 6MT intermittently won’t go into gear

Kaiv is his user name on here, send him a Private message and I'm sure he will quote you the job. He has done work to lots of members cars.
http://www.m3forum.net/m3forum/member.php?u=82516
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Old Wed, Feb-08-2017, 04:45:44 AM   #23
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Default Re: E46 M3 6MT intermittently won’t go into gear

I'm having a similar issue with my M Roadster. I believe it's either the clutch slave or master cylinder. Bought both to replace. Just waiting for the snow to go away to do the work.
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Old Wed, Feb-08-2017, 05:08:58 AM   #24
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Default Re: E46 M3 6MT intermittently won’t go into gear

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I'm having a similar issue with my M Roadster.
Does your shift lever actually hard stop sometimes instead of going into gear? Or do the gears grind?

--titaniummm
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Old Wed, Feb-08-2017, 08:12:42 AM   #25
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Default Re: E46 M3 6MT intermittently won’t go into gear

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Originally Posted by titaniummm View Post
Thanks for the reply.

95% of the shifts are fine and no it doesn't seem to be specific gears except that the most likely problem gear is reverse.

Also, when it doesn't go into a gear, the gears aren't grinding, it's as if there is a new hard stop before the shift lever goes far enough.

Who is Kaiv and what would it cost to have the SMG swapped in?

Thanks.

--titaniummm
It's hard to tell if this is actual an 'issue' with the transmission or not... In most manual cars I've driven this can happen where the gear doesnt want to fully engage, maybe because the the gear selector collar and gear itself are spinning at the same speed but slightly offset, or something (just a guess). Usually the solution is just to release the shifter (don't force it in), release the clutch in neutral and then try again. If you've been driving the car for 3 years and only have an issue 5% of the time, your car may be fine. Or some of the synchros may be past their prime. My trans has 170k miles and I usually double clutch into second gear before the transmission is warmed up, it engages easier that way

I believe reverse is synchronized in the 420g (someone correct me if I'm wrong) but the synchro could be smaller or weaker than the rest. Lots of times reverse isnt synchronized, in the VW Up rental I've been driving for example you have to be really smooth and careful engaging reverse or the gears will grind
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Old Wed, Feb-08-2017, 03:13:57 PM   #26
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Default Re: E46 M3 6MT intermittently won’t go into gear

Even though most shifts are fine, sometimes the problem occurs in clusters, e.g. I'm not able to get the car into a particular gear after trying 10 times. That's a particular challenge when the car is in the garage and the problem is with reverse.

When that happens, among other things, I've tried turning off the engine. And in that case, the "block" is usually still there. I may be wrong, but that makes me think it isn't a synchro issue. I've also tried double clutching to no avail.

Once it's in the problem mode as described above, selecting a different gear and moving the car a bit "fixes" the problematic gear. Or sometimes moving the gear lever back and forth in neutral aggressively a few times does the trick. Sooner or later something works.

--titaniummm

Last edited by titaniummm; Wed, Feb-08-2017 at 03:21:58 PM.
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Old Wed, Feb-08-2017, 03:31:24 PM   #27
Paulo M
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Default Re: E46 M3 6MT intermittently won’t go into gear

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Originally Posted by ac_2007 View Post
Your car has high mileage. There are many things it could be.

Do you have a short-shift kit? Mine was horrible for this.
Back to OEM shifter + trans fluid change = night & day difference.
Does ssk cause hard shifting? I only replaced my lever with the e60 lever kit and now it's a pain to get into 1st. But it's on and off. If I'm stopped at a light it may take me a while to get it into gear.

Car has 150k miles but this hard shifting only occurred after e60 lever replacement
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Old Wed, Feb-08-2017, 03:46:16 PM   #28
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Default Re: E46 M3 6MT intermittently won’t go into gear

Quote:
Originally Posted by titaniummm View Post
Does your shift lever actually hard stop sometimes instead of going into gear? Or do the gears grind?

--titaniummm
The shift lever feels like there's something stopping it from going into gear. No grinding whatsoever. One reason that leads me to believe that it is a bad master cylinder is because I can put my foot underneath the clutch pedal and lift up on it. So the clutch pedal isn't fully returning on it's own. When I lift the clutch pedal back up, all shifting problems go away.
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Old Wed, Feb-08-2017, 03:52:10 PM   #29
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Default Re: E46 M3 6MT intermittently won’t go into gear

I would do the cheap and easy stuff first. Engine mounts and tranny mounts, they're 16+ years old now and you had 120k miles three years ago. Take a look at other people's pictures of old mounts, yours will look the same. They generally don't break, but they're rubber and they wear and move and align differently.

Those would only take a couple hours yourself to do and around $200.

I would go for the shifter refresh if above doesn't help. ECS or FCP sell kits with the wear pieces. Pretty cheap and probably due.

http://www.realoem.com/bmw/enUS/show...diagId=25_0375



Also look at your clutch invoice, if they didn't replace your pivot pin it's probably garbage now. Mine didn't look like a car part at 155k. Number 6 below. You can replace it with a brass one from a e39.

http://www.realoem.com/bmw/enUS/show...diagId=21_0093
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Old Wed, Feb-08-2017, 04:42:24 PM   #30
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Default Re: E46 M3 6MT intermittently won’t go into gear

I am totally not an expert, but I agree with Poms. A visual inspection of the motor and tranny mounts may not tell you the truth of their condition, and they have had a good long existence....they are likely done. Your description of the symptoms sound like a classic worn mount issue.
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Discussing E46 M3 6MT intermittently won’t go into gear in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)