BMW X5 Vibration/ booming and harshness

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#1
Make
Bmw
Model
E53 X5 4.4
Year
2002
Miles
156000
Engine
4.4V8
Hi. I have a 2002 BMW X5 E53 4.4
When accelerating through 2-2.5k rpm the engine /drive train is noticeably harsh and boomy in the cabin. This is also accompanied by a high frequency vibration.
If stationary in P or N and the engine is revved there is no vibration or harshness so it is doen to the transmission or driveshaft.
When the car is started from cold it idles quietly but after circa 5 min when things have warmed up a knocking noise can be heard from the bellhousing area. Could this be the torque converter or flex plate?
Can a failing driveshaft centre support bearing cause these symptoms?
Any help is greatly appreciated.
 

bp042665

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#2
yes to the noise in the bell housing area but the center support can create a vibration at any speed also the rubber u joint cuppler
 
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#3
If the knocking is the TC what knocks? It's full of fluid. From what I can see underneath the flex plate bolts are tight and I can see no cracks or damage.
 

grcauto

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#4
If the knocking is the TC what knocks? It's full of fluid. From what I can see underneath the flex plate bolts are tight and I can see no cracks or damage.
You would need to separate the engine trans to check the flexplate for cracking. They usually crack around the bolts where it's bolted to the crank.
BTW they usually have a noise during start and if the crank sensor reads the ring it'll usually set cks codes.
 
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#5
There occasionally is a noise on start up. It's not when cranking but just as the motor catches - I think that maybe the cam chain rattling before oil is up to full pressure in the tensioner tho.
The knock is only evident when warm and it does it in N R and D.
Im getting under it again today with a stethoscope.
 

nickb2

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#6
Hmm this reminds me of a few older 350's I have seen in my day. But the thing that is getting me is that you say

The knock is only evident when warm and it does it in N R and D.
Maybe a drum going loose. The trans guru here is BP and he said "yup"

So I am guessing these x5's suffer also from cronic flex plate. I have seen weirder stuf on x5's. Lets say not a beemer I want to buy. Normally, a flexx plate crack sound should be heard at any temp.
 

nickb2

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#7
I think that maybe the cam chain rattling before oil is up to full pressure in the tensioner tho.
This comment more reminds me of common problems I see in the shop related to the type of noise complaint you have. It is a boom box in there. Bavarian motor works do a good job of insulating cars and suv's such as yours.

Also of note, the drive shaft going to rear is much like a mercedes. There was an issue for a long time with the drive shaft center bushing.
 

nickb2

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#9
Just of note, for those who fix police chargers, how many drive shafts have you swamped out lately?. Scrap metal guy is having a hay day. AWD on a mopar interceptor sucks.

I never would of thought the day I said ford was better than mopar, but here it is. Dual rubber cushion uni joint transferring all vibration to center bearing. Can't press it out un less you know "A GUY". The center bearing destroys itself in a heart beat, specially when wide open, the transport sedan suddenly becomes a hummer
 
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#10
Hi. Just to reignite this thread.. I took the X5 to a trans specialist and we had it up on a lift trying to determine what the noise is. One chap said he didn't think it was the TC and another said it was.. He suggested unbolting the TC in situ, pushing it clear of the flex plate and running the motor thus eliminating any TC or trans rotation to make sure its not the engine.
I have to say I am pretty sure it's either the TC or flex plate and to have the TC rebuilt is circa £800..