Severe shuddering during cruising and braking

Jeef Beef · 09-29-2013, 08:47 AM

So driving today I realised something wasn't right with my car:

When I accelerate normally or have any throttle input it's totally fine
When I cruise, (i.e. in gear but no throttle input) the whole car starts shuddering quite noticeably with a knocking sound
If I put it into neutral and cruise it seems fine, but as soon as I put it into gear and clutch out there are quite a few loud knocks before the car starts shuddering again
When I brake relatively hard, I also get the same shuddering and knocking sound

The thing that confuses me is that all this goes away as soon as I touch the throttle, but it seems quite obvious that something is wrong in the drivetrain. Tried going up and down my driveway tonight and there is definitely also a distinct "thump" everytime I brake, which leads me to think that it is a problem in the wheels/suspension.

Any ideas what this could be? Thanks in advance for the input.

froop · 09-29-2013, 08:53 AM

Hmmm I have no idea what it could be but I don't think it's to do with the wheels or the suspension. If it were, it would happen at all times. If it only happens when coasting out of gear or when braking it sounds like something that happens only when the engine and transmission isn't being loaded so I'd guess that the problem is something to do with either the engine or more likely the transmission.

Of course I could be totally wrong.

Jeef Beef · 09-29-2013, 08:54 AM

Quote:

Originally Posted by froop

Hmmm I have no idea what it could be but I don't think it's to do with the wheels or the suspension. If it were, it would happen at all times. If it only happens when coasting out of gear or when braking it sounds like something that happens only when the engine and transmission isn't being loaded so I'd guess that the problem is something to do with either the engine or more likely the transmission.

Of course I could be totally wrong.

That's what gets me - it doesn't happen when there is load on the engine transmission, so I thought it was possible drivetrain related.

But then I don't get why it also happens when everything is in neutral and I brake with some force, which is why I was led to believe it was outside the drivetrain.

DR-JEKL · 09-29-2013, 06:51 PM

Sounds weird, and difficult to diagnose going on the description!

So obviously no codes? I was getting slight jerking stumbling at low revs (i.e coming into a tight corner under no acceleration just coasting) and new vanos solenoids and o2 sensors sorted that out but from what you describe it sounds like its a driveline issue?

Does the clutch feel fine? IS the noise coming from the rear (I'm thinking diff possibly?)

05C4R · 09-29-2013, 08:12 PM

Dead hooker in the boot?

ansch · 09-29-2013, 09:31 PM

does it idle ok? some sort of vacuum leak perhaps

dorkdog · 09-29-2013, 11:06 PM

I think it may be the driveshaft. Guibo? I had a Z3 used to do that a little between shifts,

Just a thought...

Jeef Beef · 09-29-2013, 11:20 PM

Quote:

Originally Posted by DR-JEKL

Sounds weird, and difficult to diagnose going on the description!

So obviously no codes? I was getting slight jerking stumbling at low revs (i.e coming into a tight corner under no acceleration just coasting) and new vanos solenoids and o2 sensors sorted that out but from what you describe it sounds like its a driveline issue?

Does the clutch feel fine? IS the noise coming from the rear (I'm thinking diff possibly?)

No codes unfortunately, yeh diff might be on point. The clutch feels fine under my foot.

Quote:

Originally Posted by Ian///M

give Pete at Advan a call

Yep car's going in tomorrow.

Quote:

Originally Posted by ansch

does it idle ok? some sort of vacuum leak perhaps

Idles fine and I looked around for a vacuum leak but to no avail.

Quote:

Originally Posted by dorkdog

I think it may be the driveshaft. Guibo? I had a Z3 used to do that a little between shifts,

Just a thought...

Good point, will get that checked out when the car goes in.

05C4R · 09-29-2013, 11:38 PM

check the boot,

sbce90 · 09-30-2013, 12:22 AM

I guess you just have to accelerate everywhere you go now!

Jeef Beef · 09-30-2013, 01:52 AM

Quote:

Originally Posted by beemer

check the boot,

I removed the dead hooker already

05C4R · 09-30-2013, 03:40 AM

ha ha, you never know it really can catch you out sometimes, but strike that off the list then, it was that or your diff

Jeef Beef · 10-02-2013, 04:26 AM

Turned out to be a loose rear left wheel. Someone had kindly undid all the bolts (except for the locking nut) when my car was parked on Saturday.

DR-JEKL · 10-02-2013, 07:37 AM

Quote:

Originally Posted by Jeef Beef

Turned out to be a loose rear left wheel. Someone had kindly undid all the bolts (except for the locking nut) when my car was parked on Saturday.

Hmm really!!! any chance someone was in the midst of flogging your rims and you turned up to drive away?? do you have a lock bolt on yours?

At least that's an easy fix, but could have turned out nasty!!!!

skidz · 10-02-2013, 05:41 PM

mmmm I wonder what that would feel like

Kiwi Peter · 10-02-2013, 07:36 PM

Quote:

Originally Posted by skidz

mmmm I wonder what that would feel like

Yes Pav you do hold the record for driving the furthest distance with a loose wheel I think 230km well done

05C4R · 10-02-2013, 08:12 PM

Quote:

Originally Posted by Jeef Beef

Turned out to be a loose rear left wheel. Someone had kindly undid all the bolts (except for the locking nut) when my car was parked on Saturday.

i was so close

Chandon · 10-02-2013, 10:01 PM

Seems like someone was pretty bothered to mess with your car..

HecticX5 · 10-02-2013, 10:31 PM

Quote:

Originally Posted by Jeef Beef

Turned out to be a loose rear left wheel. Someone had kindly undid all the bolts (except for the locking nut) when my car was parked on Saturday.

Sorry uleh, it wouldn't have been an issue if i could get rid of that effing lock nut...I even had bricks prepped.

Chandon · 10-03-2013, 02:59 AM

Quote:

Originally Posted by yulook

wtf? what is up with these sydney people.. (no hate)

seems to be a lot of jelly people... -_-

You're definitely not wrong lol

09-29-2013, 08:47 AM	#1
Jeef Beef Lord Captain Commander 110 Rep 3,093 Posts Drives: a sleeper Join Date: Oct 2009 Location: Sydney, Australia iTrader: (0)	Severe shuddering during cruising and braking So driving today I realised something wasn't right with my car: When I accelerate normally or have any throttle input it's totally fine When I cruise, (i.e. in gear but no throttle input) the whole car starts shuddering quite noticeably with a knocking sound If I put it into neutral and cruise it seems fine, but as soon as I put it into gear and clutch out there are quite a few loud knocks before the car starts shuddering again When I brake relatively hard, I also get the same shuddering and knocking sound The thing that confuses me is that all this goes away as soon as I touch the throttle, but it seems quite obvious that something is wrong in the drivetrain. Tried going up and down my driveway tonight and there is definitely also a distinct "thump" everytime I brake, which leads me to think that it is a problem in the wheels/suspension. Any ideas what this could be? Thanks in advance for the input. __________________ E82 135i M-sport: SGM/6MT/Black
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09-29-2013, 08:53 AM	#2
froop Colonel 171 Rep 2,682 Posts Drives: 08 AW 6MT E82 Join Date: Jul 2012 Location: Sydney, Australia iTrader: (3)	Hmmm I have no idea what it could be but I don't think it's to do with the wheels or the suspension. If it were, it would happen at all times. If it only happens when coasting out of gear or when braking it sounds like something that happens only when the engine and transmission isn't being loaded so I'd guess that the problem is something to do with either the engine or more likely the transmission. Of course I could be totally wrong. __________________ froop's AW 135i Build Thread
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09-29-2013, 06:51 PM	#4
DR-JEKL Major General 898 Rep 6,285 Posts Drives: Space Grey E92 335i 6MT Join Date: Jul 2012 Location: Newcastle Ozstraylia iTrader: (3)	Sounds weird, and difficult to diagnose going on the description! So obviously no codes? I was getting slight jerking stumbling at low revs (i.e coming into a tight corner under no acceleration just coasting) and new vanos solenoids and o2 sensors sorted that out but from what you describe it sounds like its a driveline issue? Does the clutch feel fine? IS the noise coming from the rear (I'm thinking diff possibly?)
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09-29-2013, 08:12 PM	#5
05C4R Major 62 Rep 1,147 Posts Drives: M3 Join Date: Jul 2008 Location: sydney iTrader: (0)	Dead hooker in the boot?
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09-29-2013, 09:31 PM	#6
ansch Captain 33 Rep 645 Posts Drives: SGM 135i Join Date: Dec 2008 Location: Brisbane, Australia iTrader: (1)	does it idle ok? some sort of vacuum leak perhaps
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09-29-2013, 11:06 PM	#7
dorkdog Big Mouth No Filter 49 Rep 586 Posts Drives: 128i Montego Blue 6MT Sport Join Date: Feb 2012 Location: Puyallup WA iTrader: (0)	I think it may be the driveshaft. Guibo? I had a Z3 used to do that a little between shifts, Just a thought... __________________ We do not inherit the Earth from our parents; we borrow it from our children
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09-29-2013, 11:38 PM	#9
05C4R Major 62 Rep 1,147 Posts Drives: M3 Join Date: Jul 2008 Location: sydney iTrader: (0)	check the boot,
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09-30-2013, 12:22 AM	#10
sbce90 Me Boosta 249 Rep 5,721 Posts Drives: 320i / MB C63 / VW up! Join Date: Jan 2010 Location: Sydney, Australia iTrader: (3)	I guess you just have to accelerate everywhere you go now!
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09-30-2013, 03:40 AM	#12
05C4R Major 62 Rep 1,147 Posts Drives: M3 Join Date: Jul 2008 Location: sydney iTrader: (0)	ha ha, you never know it really can catch you out sometimes, but strike that off the list then, it was that or your diff
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10-02-2013, 04:26 AM	#13
Jeef Beef Lord Captain Commander 110 Rep 3,093 Posts Drives: a sleeper Join Date: Oct 2009 Location: Sydney, Australia iTrader: (0)	Turned out to be a loose rear left wheel. Someone had kindly undid all the bolts (except for the locking nut) when my car was parked on Saturday. __________________ E82 135i M-sport: SGM/6MT/Black
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10-02-2013, 05:41 PM	#15
skidz Banned 16 Rep 511 Posts Drives: 1mers nuts :D Join Date: Apr 2013 Location: unda da bridge iTrader: (0)	mmmm I wonder what that would feel like
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10-02-2013, 10:01 PM	#18
Chandon Major 99 Rep 1,102 Posts Drives: 1M Join Date: Apr 2013 Location: Sydney, Australia iTrader: (1)	Seems like someone was pretty bothered to mess with your car..
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