Grinding Gear 1-2 Shift 335xi F30

bmw-nj · 10-09-2014, 08:38 PM

I have a 2014 335xi M Sport with the 6 speed transmission. I have noticed recently that under heavy throttle the 1-2 shift has a grinding noise to it. I am familiar with the notorious notchyness of bmw transmissions but this is different. It only happens under heavy throttle though.

Yes I know how to drive manual. This is my 3rd 335 in stick.

Any ideas on the issue?

JJS · 10-10-2014, 02:53 AM

I suspect faulty synchromesh.

bmw-nj · 10-10-2014, 07:11 AM

Quote:

Originally Posted by JJS

I suspect faulty synchromesh.

Thanks. Is that a big project to fix?

KGB_123_99 · 10-10-2014, 09:12 AM

Quote:

Originally Posted by bmw-nj

Thanks. Is that a big project to fix?

Not cheap. Take care of it under warranty. Synchro only gets worse over time.

rjpeaks · 10-10-2014, 10:32 AM

take it in

bmw-nj · 10-10-2014, 10:45 AM

Thanks for the info guys. I just sent my service advisor an email.

Hernandiaz11 · 10-10-2014, 01:11 PM

Quote:

Originally Posted by bmw-nj

I have a 2014 335xi M Sport with the 6 speed transmission. I have noticed recently that under heavy throttle the 1-2 shift has a grinding noise to it. I am familiar with the notorious notchyness of bmw transmissions but this is different. It only happens under heavy throttle though.

Yes I know how to drive manual. This is my 3rd 335 in stick.

Any ideas on the issue?

I would have the same issue with my E9X car but it was strangely intermittent. I've also had this issue with my brand new 435i. I've been driving manual cars for more than 10 years. I wonder if it has to do with the small valve that BMW put on these cars somewhere in the hydraulic clutch system. I can't remember the name of this valve right now.

Otherwise, yes I agree that you might have bad synchros.

bmw-nj · 10-10-2014, 01:36 PM

Wow that's terrible to hear it might not be a one off issue with mine.

Are you referring to the clutch delay valve?

Im not sure if the new ones have these and if they are removable. Does anyone know?

therealm3 · 10-10-2014, 02:01 PM

not sure if there is a CDV in an F30. been wondering that myself. Personally I think the 6MT in my F30 335 is the smoothest 3 series transmission i have had in a long time. my E90 335 was not great, E91 328 was better but still had issues 1-2, as did my E46 and E30 M3. I removed the CDV from the E90, E91, and E46 and ran Redline MTL in the box of all three. that seemed to help a bit.

bmw-nj · 10-10-2014, 03:00 PM

Quote:

Originally Posted by therealm3

not sure if there is a CDV in an F30. been wondering that myself. Personally I think the 6MT in my F30 335 is the smoothest 3 series transmission i have had in a long time. my E90 335 was not great, E91 328 was better but still had issues 1-2, as did my E46 and E30 M3. I removed the CDV from the E90, E91, and E46 and ran Redline MTL in the box of all three. that seemed to help a bit.

That's good to hear. I think mine definitely has some sort of issue.

We will find out Monday for sure at the dealer. Let's hope they are able to fix it.

FC4 · 10-10-2014, 03:08 PM

Not the first reported issue with the 6MT in these cars. There have been several who have had their transmissions replaced due to the 2nd gear synchro.

I've never had it grind, but my transmission simply doesn't want to downshift into 2nd sometimes.

bmw-nj · 10-10-2014, 03:21 PM

Quote:

Originally Posted by FC4

Not the first reported issue with the 6MT in these cars. There have been several who have had their transmissions replaced due to the 2nd gear synchro.

I've never had it grind, but my transmission simply doesn't want to downshift into 2nd sometimes.

That's odd my car will always downshift into second easily but does not like to engage into 2nd from 1st under heavy throttle. When it does engage it grinds.

Hoping the transmission does not need to be replaced. I would be out of the car for awhile.

bmwperson · 10-10-2014, 03:26 PM

I have replaced syncros on my 260 getrag, they are $200 and a couple hours to replace once you have the trans off.

My 6MT never has issues, it seems downshifting to 1st is not as smooth but otherwise I thought the trans is great. If you suspect is the syncro, just double clutch. Pull the car out of gear, release the clutch, push it in and try shifting to the next gear. If it doesn't grind it's the syncro

bmw-nj · 10-10-2014, 06:09 PM

Quote:

Originally Posted by bmwperson

I have replaced syncros on my 260 getrag, they are $200 and a couple hours to replace once you have the trans off.

My 6MT never has issues, it seems downshifting to 1st is not as smooth but otherwise I thought the trans is great. If you suspect is the syncro, just double clutch. Pull the car out of gear, release the clutch, push it in and try shifting to the next gear. If it doesn't grind it's the syncro

Thanks for that test. I will try it and see what happens.

1987E30M3 · 10-11-2014, 11:05 AM

This happend to me at around 10k miles, needed the entire transmission replaced because my synchronization was off. Make an appointment asap, because the grinding will only get worse.

bmw-nj · 10-11-2014, 01:23 PM

Quote:

Originally Posted by 1987E30M3

This happend to me at around 10k miles, needed the entire transmission replaced because my synchronization was off. Make an appointment asap, because the grinding will only get worse.

Wow I'm sorry to hear that. How long was your car in the shop for?

Is it smooth from 1-2 shift now or still a little notchy?

I only have 5,500 miles on it.

AudiA4 · 08-10-2015, 07:34 AM

OP - what was the final resolution of this issue? I text drove a 6MT 335xi a few weeks ago, and noticed the same grind on 1-2 shifts intermittently (told the dealership about it). I just assumed it was some issue with that car. But NOW I just drove home with my new (to me) 2014 335i 6MT, and both my son and I noticed it happening periodically, generally on a more aggressive 1-2 shift. It is more than a bit disconcerting.

p.s. Overall though, I think this 6MT is MUCH improved over my E90 330i!!!! Much to my relief.

AudiA4 · 08-28-2015, 05:41 PM

Quote:

Originally Posted by AudiA4

OP - what was the final resolution of this issue? I text drove a 6MT 335xi a few weeks ago, and noticed the same grind on 1-2 shifts intermittently (told the dealership about it). I just assumed it was some issue with that car. But NOW I just drove home with my new (to me) 2014 335i 6MT, and both my son and I noticed it happening periodically, generally on a more aggressive 1-2 shift. It is more than a bit disconcerting.

p.s. Overall though, I think this 6MT is MUCH improved over my E90 330i!!!! Much to my relief.

Well, I took mine in. It was a quick diagnosis: Faulty 2nd gear synchro. Solution: new transmission (BMW doesn't let dealers even crack open the transmission case). It's on order for replacement next week.

Pretty disappointing in a car with 20,000 miles.

CalCarNut · 08-28-2015, 07:21 PM

I can imagine. The bright side is it didn't let go on 48,001 miles, right?

AudiA4 · 08-28-2015, 08:14 PM

Quote:

Originally Posted by SoCalDave

I can imagine. The bright side is it didn't let go on 48,001 miles, right?

True! The SA said it would have been nearly $7,000 outside of warranty. That seems a bit high...he might've been just throwing out numbers.

bmw-nj · 08-28-2015, 08:21 PM

Quote:

Originally Posted by AudiA4

Quote:

Originally Posted by SoCalDave

I can imagine. The bright side is it didn't let go on 48,001 miles, right?

True! The SA said it would have been nearly $7,000 outside of warrant. That seems a bit high...he might've been just throwing out numbers.

That's an accurate number I believe. They told me the cost is 7k but if it was outside of warranty it would be at least 9k.

waynestl8 · 05-16-2016, 10:01 AM

This just starting doing the same thing on my 2014 335i - @ 30,000 miles. I have an appointment at the dealer to get this repaired under warranty.

10-09-2014, 08:38 PM	#1
bmw-nj Captain 99 Rep 700 Posts Drives: 2014 BMW 335 xdrive M sport Join Date: Apr 2011 Location: Hillsborough, NJ iTrader: (1)	Grinding Gear 1-2 Shift 335xi F30 I have a 2014 335xi M Sport with the 6 speed transmission. I have noticed recently that under heavy throttle the 1-2 shift has a grinding noise to it. I am familiar with the notorious notchyness of bmw transmissions but this is different. It only happens under heavy throttle though. Yes I know how to drive manual. This is my 3rd 335 in stick. Any ideas on the issue?
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10-10-2014, 02:53 AM	#2
JJS Lieutenant 123 Rep 441 Posts Drives: BMW F31 335i 6MT M-Sport Join Date: Dec 2013 Location: Wellington, NZ iTrader: (0)	I suspect faulty synchromesh. __________________ EBII 335i Touring M-Sport (Munich built July 2013) \| 6 Speed Manual \| 2VF Adaptive M Suspension \| 2VL Variable Sports Steering \| 403M wheels \| M-Sport brakes \| 688 Harman Kardon \| 494 Heated Seats \| 610 HUD \| 322 Comfort Access \| 5AC High-Beam Assist \| 609 Navigation Professional \|
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10-10-2014, 10:32 AM	#5
rjpeaks Lieutenant 14 Rep 577 Posts Drives: F30 335i M-Sport 6pd Join Date: May 2014 Location: Huntington Beach iTrader: (0)	take it in __________________ 335I M-Sport 6spd EBII MPPK MPE DHP HK PDC ZTP ZPS ZPP ZDA ZPK 802.11ac ABC123
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10-10-2014, 10:45 AM	#6
bmw-nj Captain 99 Rep 700 Posts Drives: 2014 BMW 335 xdrive M sport Join Date: Apr 2011 Location: Hillsborough, NJ iTrader: (1)	Thanks for the info guys. I just sent my service advisor an email.
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10-10-2014, 01:36 PM	#8
bmw-nj Captain 99 Rep 700 Posts Drives: 2014 BMW 335 xdrive M sport Join Date: Apr 2011 Location: Hillsborough, NJ iTrader: (1)	Wow that's terrible to hear it might not be a one off issue with mine. Are you referring to the clutch delay valve? Im not sure if the new ones have these and if they are removable. Does anyone know?
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10-10-2014, 02:01 PM	#9
therealm3 Lieutenant Colonel 630 Rep 1,649 Posts Drives: F30 340 MSport Join Date: Aug 2006 Location: CA, USA iTrader: (7)	not sure if there is a CDV in an F30. been wondering that myself. Personally I think the 6MT in my F30 335 is the smoothest 3 series transmission i have had in a long time. my E90 335 was not great, E91 328 was better but still had issues 1-2, as did my E46 and E30 M3. I removed the CDV from the E90, E91, and E46 and ran Redline MTL in the box of all three. that seemed to help a bit.
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10-10-2014, 03:08 PM	#11
FC4 Brigadier General 2680 Rep 3,406 Posts Drives: Yes Join Date: May 2014 Location: US iTrader: (0)	Not the first reported issue with the 6MT in these cars. There have been several who have had their transmissions replaced due to the 2nd gear synchro. I've never had it grind, but my transmission simply doesn't want to downshift into 2nd sometimes.
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10-10-2014, 03:26 PM	#13
bmwperson Second Lieutenant 29 Rep 209 Posts Drives: 4wheels Join Date: Dec 2013 Location: Pl iTrader: (0)	I have replaced syncros on my 260 getrag, they are $200 and a couple hours to replace once you have the trans off. My 6MT never has issues, it seems downshifting to 1st is not as smooth but otherwise I thought the trans is great. If you suspect is the syncro, just double clutch. Pull the car out of gear, release the clutch, push it in and try shifting to the next gear. If it doesn't grind it's the syncro __________________ -- 1997 BMW M3 Single turbo 723whp GT42R 2000 BMW M5 - Daily 2014 BMW 335i xDrive 6spd loaded
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10-11-2014, 11:05 AM	#15
1987E30M3 Second Lieutenant 30 Rep 254 Posts Drives: E30 M3 & 325ic-F30 335i Xdrive Join Date: Mar 2013 Location: Manhattan, New York iTrader: (2)	This happend to me at around 10k miles, needed the entire transmission replaced because my synchronization was off. Make an appointment asap, because the grinding will only get worse.
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08-10-2015, 07:34 AM	#17
AudiA4 Major 648 Rep 1,476 Posts Drives: 2022 G01 X3 M40i (Black/Black) Join Date: May 2005 Location: Little Rock, AR, USA iTrader: (0)	OP - what was the final resolution of this issue? I text drove a 6MT 335xi a few weeks ago, and noticed the same grind on 1-2 shifts intermittently (told the dealership about it). I just assumed it was some issue with that car. But NOW I just drove home with my new (to me) 2014 335i 6MT, and both my son and I noticed it happening periodically, generally on a more aggressive 1-2 shift. It is more than a bit disconcerting. p.s. Overall though, I think this 6MT is MUCH improved over my E90 330i!!!! Much to my relief. __________________ 2022 G01 X3 M40i (Black Sapphire/Black), HK, DAP, PAP, Shadow Line 2014 F30 335i (EB) 6MT, M Sport, Premium, Tech, DHP, HK, CW, M Brakes, M Exhaust 2006 E90 330i (Silver) 6MT, Sport
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08-28-2015, 07:21 PM	#19
CalCarNut Brigadier General 1061 Rep 3,258 Posts Drives: 2015 F36 Jet Black Sport Line Join Date: Apr 2015 Location: Blue Skies iTrader: (0) Garage List 2012 BMW X3 [0.00] 2015 BMW 428i Gran ... [10.00] 1996 Chevrolet Impa ... [8.00]	I can imagine. The bright side is it didn't let go on 48,001 miles, right? __________________ 2015 BMW F36 428i JetBlack. Sport Line Edition 25% 3M Tint\|
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05-16-2016, 10:01 AM	#22
waynestl8 New Member 2 Rep 7 Posts Drives: 2018 BMW M4 Comp package Join Date: May 2016 Location: St Louis iTrader: (0) Garage List 2018 BMW/M4 [0.00]	grinding 1st to 2nd This just starting doing the same thing on my 2014 335i - @ 30,000 miles. I have an appointment at the dealer to get this repaired under warranty.
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