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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 Sun, Oct-21-2012, 02:23:10 AM   #1
Declan
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Question Driveshaft Vibration - Diff Bushes, Flex Disc & CSB all replaced. What next?

Hi guys,

I've owned my M3 for about 4 months now and have had issues with the driveshaft from day dot. They have progressively gotten worse over time and unfortunately weren't picked up in the PPI. It has gotten to the point where I think I've ticked almost everything off the list and still get this issue.

Symptoms

I'm getting a vibration from the drive shaft under load. Exactly like this video except it only requires about 40%+ throttle to occur or less if I'm on a hill. It's worst in second gear between 3,000 - 4,000RPM.


What's Been Done

The flex disc / guibo was replaced by the previous owner just before I bought the car and looks fine. A couple of workshops have checked this but only visually so I'm not convinced we can completely tick that one off. Still, I don't know how you could possibly fk that job up to get these symptoms and it was done by a mechanic so surely it must be ok.

Upon inspections by BMW and an indi they recommended the front diff bush was replaced along with the rear cover which houses the rear bushes. I also got seals, oil and new bolts at the same time. This however didn't fix the problem.

I figured after this it must be the CSB so I replaced that yesterday and if anything the problem is now worse. I lined up the driveshaft to the factory marks but I guess there is a chance I could've been 1 tooth off. Pretty certain I wasn't though.

What Next
I'm at a bit of a loss right now. I'm thinking that it could be the balance of the driveshaft so a rebalance will fix the issue but it seems strange to me that I would get a really bad vibration for a split second. I'm no mechanic but logically I'd expect if it was misbalanced then the vibration would be constant and the fierceness of the vibration would directly correlate with the speed of the vehicle which isn't the case.

Is there anything you guys can recommend. I've given up on trying to fix the issue myself and will be taking it to a shop. I would like to however give them a steer as to the things I want them to check / do as oppose to saying I've got a vibration, please fix it.

Any recommendations would be greatly appreciated I can't wait until I can actually drive my M3 properly for the first time since buying it a few months ago.
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Old Sun, Oct-21-2012, 06:19:25 AM   #2
RedM3/4
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Default Re: Driveshaft Vibration - Diff Bushes, Flex Disc & CSB all replaced. What next?

I can't tell anything from that vid, maybe others can...
pinion bearing, tranny mount, engine mounts come to mind.
----
First, I'd check for even and proper torque on all the guibo/csb parts, as well as tranny mount bolts

Good you knew to put everything back on the same alignment; wasn't aware of factory marks. Is there one for guibo to tranny, can you therefore be certain the original owner didn't mis-align that part?

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Old Sun, Oct-21-2012, 07:31:15 AM   #3
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Default Re: Driveshaft Vibration - Diff Bushes, Flex Disc & CSB all replaced. What next?

So what ur saying is after 40% of throttle it will go away? or thats just when it starts? is it there under WOT? highway cruising?

Working as a tech myself (i know this is a complete different vehicle) I had a 2500 Dodge ram hemi in the shop last week had a vibration constantly at 50% throttle and up. It came from another shop where driveshafts were re-placed, new tires, CSB...

It ended up being the release bearing when the clutch was engaged and had just enough force (around that 50%) to start binding and not jamming to the fingers. clutch moved in and out np at idle and when driving tho...only 1 ever seen like this.

Now im not saying that this is ur problem but it is a possibility. Do u have any of the under drive pulleys on ur car?
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Old Sun, Oct-21-2012, 07:43:37 AM   #4
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Default Re: Driveshaft Vibration - Diff Bushes, Flex Disc & CSB all replaced. What next?

Quote:
Originally Posted by Taunto View Post
So what ur saying is after 40% of throttle it will go away? or thats just when it starts? is it there under WOT? highway cruising?

Working as a tech myself (i know this is a complete different vehicle) I had a 2500 Dodge ram hemi in the shop last week had a vibration constantly at 50% throttle and up. It came from another shop where driveshafts were re-placed, new tires, CSB...

It ended up being the release bearing when the clutch was engaged and had just enough force (around that 50%) to start binding and not jamming to the fingers. clutch moved in and out np at idle and when driving tho...only 1 ever seen like this.

Now im not saying that this is ur problem but it is a possibility. Do u have any of the under drive pulleys on ur car?
I may not have been clear in the original description. Just as in the video my vibration lasts for a split second. It is under load and definitely the driveshaft that is causing the noise.

40% throttle + induces the vibration at 3-4krpm in 2nd and 5-7k in 1st. It only happens for a split second then goes away. If you floor it in 2nd at 5,000rpms then it is fine. Doesn't occur at all in 3rd gear.
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Old Sun, Oct-21-2012, 08:55:14 AM   #5
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Default Re: Driveshaft Vibration - Diff Bushes, Flex Disc & CSB all replaced. What next?

I had to watch the video like 20 times to realize what you were describing.

It almost sounds like tire rubbing but that can't possibly it. Have you taken the car to a mechanic? I would Google/Yelp/Forum search a good independent BMW specialist around where you live and get it diagnosed.
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Old Sun, Oct-21-2012, 11:49:44 AM   #6
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Default Re: Driveshaft Vibration - Diff Bushes, Flex Disc & CSB all replaced. What next?

Quote:
Originally Posted by hoonpv View Post
I had to watch the video like 20 times to realize what you were describing.

It almost sounds like tire rubbing but that can't possibly it. Have you taken the car to a mechanic? I would Google/Yelp/Forum search a good independent BMW specialist around where you live and get it diagnosed.
I've had an indi and BMW look at it. They both said it was the diff bushes warn to the point where the diff would move under load throwing the shaft out of alignment and causing the vibration. Turns out that wasn't the issue as all the bushes were replaced.

The guy who posted that original video replaced his flex disc and CSB and that fixed his problem. Thing is both my CSB and disc have been replaced and I still have the issue. I personally think it could be balance but I'm no expect so would like to think what some of you guys with experience think it could be.
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Old Sun, Oct-21-2012, 01:50:51 PM   #7
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Default Re: Driveshaft Vibration - Diff Bushes, Flex Disc & CSB all replaced. What next?

I have never taken my driveshaft apart, but I believe that if it is not put together again in the same way it was taken apart, it will be off balance and cause vibration. Bet the guy before you took it apart and didn't assemble it correctly. When you take it apart you need to mark the way it goes back together...
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Old Sun, Oct-21-2012, 01:52:31 PM   #8
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Default Re: Driveshaft Vibration - Diff Bushes, Flex Disc & CSB all replaced. What next?

Quote:
Originally Posted by matthias2280 View Post
I have never taken my driveshaft apart, but I believe that if it is not put together again in the same way it was taken apart, it will be off balance and cause vibration. Bet the guy before you took it apart and didn't assemble it correctly. When you take it apart you need to mark the way it goes back together...
I took it apart when doing the CSB and it used the factory alignment marks when putting it back together. Still, it could need re-balancing for whatever reason. I think it's either that or the U joints.
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Old Sun, Oct-21-2012, 04:15:47 PM   #9
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Default Re: Driveshaft Vibration - Diff Bushes, Flex Disc & CSB all replaced. What next?

I had a similar vibration on my 03 at 120k or so (actually a bit worse). Only under load and only intermittent. Did the CSV, guibo, tranny mounts. Turned out to be the CV joint on the driveshaft.

I bought a rebuilt shaft from driveshaftspecialist,com, problem solved. Strangely the CV joint on the new shaft felt looser than the old one. It comes with a new CSB.

Good luck.
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Old Sun, Oct-21-2012, 04:42:14 PM   #10
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I understand the guibo can be mistakenly installed backwards. Could that be it?

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Discussing Driveshaft Vibration - Diff Bushes, Flex Disc & CSB all replaced. What next? 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)