SOLVED: is your 6mt rough?

Balr14 · 10-29-2019, 10:37 AM

Sometimes my car bucks when starting out in first gear and I am slow to take my foot off the clutch. When I'm quick off the clutch pedal it does not occur. I'm pretty sure it's the clutch interlock switch. I had a Subaru that did the same thing and I could make it happen any time I was inclined just by being slow off the clutch.

Otherwise, it's very smooth and easy shifting.

oVeRdOsE. · 10-29-2019, 10:41 AM

Quote:

Originally Posted by oVeRdOsE.

Just realize on my E91 I have a jobber front drive shaft while removing it !
it also got a grease port.

I'll ditch the used OEM drive shaft, and rebuilt mine for sure.

BUT !

What is the universal joint part # ?

Ive looked on amazon, ebay, realoem and now I've send a email to Dorman.

found it. thanks to Dorman

Powertrain industries. Their part number is 2751-221. Replaced by Part Number 1751-22

hassmaschine · 10-29-2019, 12:28 PM

Quote:

Originally Posted by Balr14

Sometimes my car bucks when starting out in first gear and I am slow to take my foot off the clutch. When I'm quick off the clutch pedal it does not occur. I'm pretty sure it's the clutch interlock switch. I had a Subaru that did the same thing and I could make it happen any time I was inclined just by being slow off the clutch.

Otherwise, it's very smooth and easy shifting.

Clutch interlock switch? There's no switch on the clutch (except to determine the pedal position). There is a CDV, although that doesn't really affect slow clutch movements.

porsche959 · 10-29-2019, 04:40 PM

spoke too soon. the bucking/roughness has actually gotten worse with time. something is wearing...replacing guibo and checking ujoints and will report back.

hassmaschine · 10-29-2019, 11:04 PM

I'll bet it's the DMF.

oVeRdOsE. · 10-30-2019, 07:35 AM

Quote:

Originally Posted by porsche959

spoke too soon. the bucking/roughness has actually gotten worse with time. something is wearing...replacing guibo and checking ujoints and will report back.

it takes literally 5 minutes to check the front drive shaft. (rear not sure, didn't check it yet).

Remove the transmission skid plate, there's about 6 8mm screws.

And the drive shaft is there, very accessible.

turn it by hand, and make sure the transfer case and front diff are not turning. If the shaft is turning, you have a loose.

>And if you're RWD, might be the rear drive shaft bearing or gibo or ujoint. Ebay is your friend. When you type bmw drive shaft, those items are popping up.

Anyway, it took about 4 hours to search on that topic. Common problem, lot of part available, the only issue is to find the one at a good price. Goes from 30$ (salvage yard) to 1000+ $ (new)

porsche959 · 10-30-2019, 09:54 AM

Quote:

Originally Posted by oVeRdOsE.

it takes literally 5 minutes to check the front drive shaft. (rear not sure, didn't check it yet).

Remove the transmission skid plate, there's about 6 8mm screws.

And the drive shaft is there, very accessible.

turn it by hand, and make sure the transfer case and front diff are not turning. If the shaft is turning, you have a loose.

>And if you're RWD, might be the rear drive shaft bearing or gibo or ujoint. Ebay is your friend. When you type bmw drive shaft, those items are popping up.

Anyway, it took about 4 hours to search on that topic. Common problem, lot of part available, the only issue is to find the one at a good price. Goes from 30$ (salvage yard) to 1000+ $ (new)

have rwd, so will check those last 3 you listed

oVeRdOsE. · 10-30-2019, 09:58 AM

Quote:

Originally Posted by porsche959

have rwd, so will check those last 3 you listed

same same but different.

turn is to see if its loose. loose ujoint, no matter if its front or back, will give a kick on deceleration then get back on gas.

Balr14 · 10-30-2019, 11:46 AM

Quote:

Originally Posted by hassmaschine

Clutch interlock switch? There's no switch on the clutch (except to determine the pedal position). There is a CDV, although that doesn't really affect slow clutch movements.

That's curious. I guess I should start a thread to see what causes this.

oVeRdOsE. · 11-08-2019, 05:20 PM

did the front drive shaft u joints. They were pretty shot ! loose loose loose.

I removed the front drive shaft, and then take it for a spin rwd. Kicks were from the drive shaft ujoint for sure.

Note that the OEM BMW drive shaft is NOT serviceable. Fortunately the last owner replace the drive shaft with a jobber one. Ujoints are 7$ each. And they probably last the same or longer than the OEM, since they got a port for a grease gun.

porsche959 · 01-03-2020, 01:23 PM

Interesting development.

Bucking is noticeably reduced after my 3 stage intake install and 330i flash.

I think it has something to do with bmw throttle response software/electronics.

I also flashed the 330i tune before installing the intake and pedal response improved. Don’t quite remember if the bucking went away tho.

fastboatster · 01-03-2020, 07:08 PM

Might have had a bad DISA valve if your car came with it.

10-29-2019, 10:37 AM	#23
Balr14 Lieutenant 569 Rep 408 Posts Drives: 2020 Z4 M40i Join Date: Mar 2019 Location: Menomonee Falls, Wi. iTrader: (0)	Sometimes my car bucks when starting out in first gear and I am slow to take my foot off the clutch. When I'm quick off the clutch pedal it does not occur. I'm pretty sure it's the clutch interlock switch. I had a Subaru that did the same thing and I could make it happen any time I was inclined just by being slow off the clutch. Otherwise, it's very smooth and easy shifting.
	Appreciate 0 Quote

10-29-2019, 04:40 PM	#26
porsche959 Banned 471 Rep 996 Posts Drives: porsche Join Date: Jul 2018 Location: chicago iTrader: (0)	spoke too soon. the bucking/roughness has actually gotten worse with time. something is wearing...replacing guibo and checking ujoints and will report back.
	Appreciate 0 Quote

10-29-2019, 11:04 PM	#27
hassmaschine Major General 3973 Rep 7,215 Posts Drives: "NBO" 330i Join Date: Jun 2014 Location: earth iTrader: (0)	I'll bet it's the DMF.
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11-08-2019, 05:20 PM	#32
oVeRdOsE. Lieutenant Colonel 2757 Rep 1,567 Posts Drives: F25 E91 Audi Avnt E90 Cayenne Join Date: May 2018 Location: mtl iTrader: (0)	did the front drive shaft u joints. They were pretty shot ! loose loose loose. I removed the front drive shaft, and then take it for a spin rwd. Kicks were from the drive shaft ujoint for sure. Note that the OEM BMW drive shaft is NOT serviceable. Fortunately the last owner replace the drive shaft with a jobber one. Ujoints are 7$ each. And they probably last the same or longer than the OEM, since they got a port for a grease gun.
	Appreciate 1 lab_rat394.50 Quote

01-03-2020, 01:23 PM	#33
porsche959 Banned 471 Rep 996 Posts Drives: porsche Join Date: Jul 2018 Location: chicago iTrader: (0)	Interesting development. Bucking is noticeably reduced after my 3 stage intake install and 330i flash. I think it has something to do with bmw throttle response software/electronics. I also flashed the 330i tune before installing the intake and pedal response improved. Don’t quite remember if the bucking went away tho.
	Appreciate 0 Quote

01-03-2020, 07:08 PM	#34
fastboatster Captain 389 Rep 901 Posts Drives: 2009 bmw 328i Join Date: May 2019 Location: CA iTrader: (0)	Might have had a bad DISA valve if your car came with it.
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