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-   -   SMG judder in 1st gear. Help. (http://forum.e46fanatics.com/showthread.php?t=646655)

TigMik 02-07-2009 07:52 AM

SMG judder in 1st gear. Help.
 
My smg m3 has started to struggle setting off in 1st gear. It judders and then picks up speed. Any one have a clue what it could be? Thanks:tsk:

realcompm3 02-07-2009 08:44 AM

Yeah that happens to mine too. Just easily step on the pedal when you are on 1st gear.

AllwaysLow 02-07-2009 10:35 AM

Do you mean shutters like it's struggling to keep from stalling the engine? Or do you mean buck back and forth like a bronco?

Does it do it every single time?

gsh1234567 02-07-2009 10:47 AM

Mine, too. It annoy the #$% out of me. Hope it is nothing serious. I also tried either to ease on the first gear or just drive more agreesively. Both work.

vicz84 02-07-2009 01:12 PM

my m3 does the same, judders sometimes in first gear and even second sometimes, been told that a software upgrade can sort this out, hope its not the clutch on the way out, mine has done 62000 miles and have been told that clutches dont wear out that quick in a smg unless you use launch control, which i dont.

TigMik 02-08-2009 10:32 AM

Quote:

Originally Posted by AllwaysLow (Post 9367061)
Do you mean shutters like it's struggling to keep from stalling the engine? Or do you mean buck back and forth like a bronco?

Does it do it every single time?

Yeah, like its going to stall, it judders until it gets moving. It doesnt do it every time, but it is becoming more frequent.

IFX 02-08-2009 10:46 AM

Might be the old common "jerk" from the SMG tranny.

AllwaysLow 02-08-2009 11:08 AM

Quote:

Originally Posted by TigMik (Post 9370858)
Yeah, like its going to stall, it judders until it gets moving. It doesnt do it every time, but it is becoming more frequent.

Does it ever happen without touching the gas pedal, like when you're just sitting still? Or only when you first press the gas pedal? Does it happen more on hills?

TigMik 02-08-2009 11:15 AM

Quote:

Originally Posted by AllwaysLow (Post 9370918)
Does it ever happen without touching the gas pedal, like when you're just sitting still? Or only when you first press the gas pedal? Does it happen more on hills?


Only when i touch the pedal, and it has done it once, quite bad, on a hill start.

j-dog 02-08-2009 11:40 AM

Does it act like the clutch is slipping? Like it is not grabbing? Mine does this only when cold for about the first 1-2 minutes of driving, and only in 1st. After that it is fine. It started at about 5000 miles and has not changed, now I have 26000. I am not worried about mine.

Have you tried an SMG reset?

http://forum.e46fanatics.com/showthr...ight=smg+reset

AllwaysLow 02-08-2009 11:41 AM

Have you noticed that it goes away at the same rpm level every time? somewhere around 2000rpm?

AllwaysLow 02-08-2009 12:24 PM

IMO, there are three possible causes: 1) clutch mapping, 2) airflow, or 3) fuel delivery.


If it goes away at the same rpm every time, then that would make me think it's the clutch mapping, for which there a two fixes that have worked for a lot of people. The first is free, and that's the SMG reset, which will reset the computer and allow the SMG computer to learn your driving style from the beginning.

1. Find a straight open road, and get up to about 40mph.
2. Shift into neutral.
3. Pull back on both paddle shifters for 5-10 seconds.
4. There will be no beep or indicator that it's been reset, you just have to trust the SMG gods.
5. Drive it like you always do.

The second fix is a software update from the dealer. My 05 SMG was hesitating in the lower rpm range and a software update helped me. If you're no longer under warranty then it will cost you to have it done. I believe they updated me with version 31.1, so they should be able to tell what version you have and update it if it's older than that.

A possible third fix is using sport mode, which has helped some people, but I don't really consider that a fix as much as a band-aid.

If airflow is the problem, then cleaning your MAF sensor is a cheap and easy fix, and should be done anyway even if you're not having a problem. Just get some MAF cleaner, remove the sensor, clean it, and reinstall it. And of course, check your air filter, but I doubt that's the problem.

If none of those help, the I would guess it's in the fuel filter, fuel pump, etc. But try everything else first.

TigMik 02-08-2009 01:16 PM

Quote:

Originally Posted by AllwaysLow (Post 9371013)
Have you noticed that it goes away at the same rpm level every time? somewhere around 2000rpm?


It feels like it, yes. Why's that then?

M-Power-3 02-08-2009 05:47 PM

check your intake or your MAF and clean it.

TigMik 02-09-2009 10:27 AM

Quote:

Originally Posted by M-Power-3 (Post 9372373)
check your intake or your MAF and clean it.

Where's the MAF situated? Is it after the air filter box?

AllwaysLow 02-09-2009 01:15 PM

Quote:

Originally Posted by TigMik (Post 9376361)
Where's the MAF situated? Is it after the air filter box?

This will work...

http://www.louv.tv/cars/m5/MAF/

M3 Baddie 02-09-2009 03:16 PM

it seems to be happening when i've driven mine after an hour or two... and i watch the rpm's drop under 1k maybe to liek 600 or 700 from a stop, then it picks up normally after the shudder.

Dirty B1 02-09-2009 05:29 PM

My ///M just recently started doing it . Leads me to beleive somthing is wearing out. Wonder if clutch is starting to slip. Will have to go through all the other possibilities first

M3 Baddie 02-09-2009 05:45 PM

im going to try the above posted with a smg reset. If it dosn't work im taking it in for a check up. I do think its clutch tho.

NY Z Pilot 02-09-2009 09:31 PM

launch control? we have this?


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