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Matt, Engineer
Category: Transmissions
Satisfied Customers: 21858
Experience:  Mechanical Engineer BEng Hons22 years experience in car engine industry, 10 years in formula 1
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330ci: 2004 330cicoupe with SMG. wouldnt engage gear even

Customer Question

2004 330cicoupe with SMG. wouldnt engage gear even though indicator showed it was in gear. Car would not go.... after sveral attempts, car finally hot going but felt like the gears were dragging or slipping. And even when shifted to the next gear, the rpms would jump and delay before engaging the next gear. Brought it to dealership and they diagnosed it and said I needed a new clutch. 4 days later they are saying the issue is better but still there is still a slipping or dragging going on. They told me they have calls in with BMW to diagnose further.
Submitted: 2 years ago.
Category: Transmissions
Expert:  Matt replied 2 years ago.
Hellothe SMG gearbox is pretty tricky to setup, as its an automated manual the clutch control is crucial to achieving a smooth gearshiftit sounds like the clutch position sensor need re-calibrating the cheapest way to repair it is to find someone or an indy with a GT1 or equivalent software to run the clutch adaptations. Then once that is done, you'll have to drive the car and vary your style for a day or two, and the clutch will relearn all the engagement points.
Customer: replied 2 years ago.
It's currently at the BMW dealership and they seemed stunned. Not sure what's up
Expert:  Matt replied 2 years ago.
if the clutch adaption saren't working then its possible the clutch hydraulics need some attention, the hydraulics should be bled like a normal clutch and also the actuator checked to see its raching full stroke
Expert:  Matt replied 2 years ago.
do you still need help?
Customer: replied 2 years ago.
Yes. The dealer says they are 95% sure it's the solenoids within the SMG pump and wiuld need a new pump. Even if the pump seems to be pumping correctly. They are saying 5200 for part and install
Expert:  Matt replied 2 years ago.
thats top dollar for a pump
I'd shop around a little
try these firms
or even a used pump?
Customer: replied 2 years ago.
How difficult would it be to convert it to a 6 speed manual? I've seen quite a bit of forums in these smg transmissions failing and people opting to convert for less than the cost of the pump alone.
Expert:  Matt replied 2 years ago.
Well thats true
its quite straightforward as the SMG was an option over the regular 6 pseed transmisson
its just a question of sourcing the parts
which shoudl be acase of locating a 'regular ' M3 donor and getting the transmisson, clutch pedal, clutch hydraulics
Customer: replied 2 years ago.
The smg is essentially a 6 speed manual with a pump and some electronics.
Expert:  Matt replied 2 years ago.
Yes thats true
however the shift mechanisim is different between the box types so its not just a case of unbolting the SMG solenoids and bolting on a gear lever shifter as the method of gear selection is different
Customer: replied 2 years ago.
Easy job for an indy shop? Probably a lot less than springing for a new pump
Expert:  Matt replied 2 years ago.
most definitely, if you can find a BMW independent then you'll tend to get the best service and value for money
Expert:  Matt replied 2 years ago.
do you still need help?