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Getting a low-frequency hum while under acceleration above 60mph. Car is a 2000 323it with manual transmission. Mechanic has checked wheel bearings and drive shaft, but found nothing. Thoughts?

Submitted: 473 days and 17 hours ago.

Category: BMW

Value: $40

Status: AWAITING CUSTOMER ACTION

2000 BMW 323it 6

Already Tried:
BMW mechanic has checked wheel bearings, as well as the drive shaft and u joint. All are good.

Posted by mark 473 days and 16 hours ago.

Answer

Hi,
Have you had the wheels and tyres checked, are you running normal size wheels.?
Is the noise speed related or only one speed.?
Does the noise happen only on one type of road surface.?

Any more info will help.

Thanks,mark

473 days and 16 hours ago.

Reply

Stock wheels and tire size. Noise happens under acceleration at any speed above 60 and on any road surface. This is not an out-of-balance problem with the wheels and tires.

Posted by mark 473 days and 12 hours ago.

Info Request

Hi,
When the noise is happening if you turn the steering left to right slightly does it make any differents.?
Try pressing the clutch when the noise is present,to see if its a drive train fault.
Has the centre prop shaft joint been checked.?

Thanks,mark

473 days and 12 hours ago.

Reply

Noise doesn't change when steering left or right. Only changes when accelerating; noise disappears below 60mph or when decelerating. Pressing the clutch in at speed makes the noise disappear, as I would not be accelerating at that point. Mechanic indicated the guibo was fine, if that is what you mean by the prop shaft joint.

472 days and 12 hours ago.

Reply

Any other suggestions?

Posted by mark 472 days and 10 hours ago.

Answer

Hi,
I think the next option is to check the rear diff, Can the car be run up on a ramp and the diff be checked for the noise..

Thanks,Mark

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472 days and 10 hours ago.

Reply

Mechanic did that as well, using a stethoscope. Apparently set the cruise on 70 in the process. I have asked him to order a guibo, even though I don't hear the "clicking". Other symptoms match what I understand are common when a guibo is failing. Thoughts?

Posted by mark 472 days and 7 hours ago.

Answer

Hi XXXXXXXXXXXXX,
Not sure on what you mean by guibo.??
Can you tell from what area the noise is coming from,
Is it speaker related.??

Thanks,Mark

472 days and 7 hours ago.

Reply

The guibo is the flexible coupler that joins the drive shaft and the rear of the transmission. Right? As mentioned previously, this is a humming noise coming from the drivetrain under acceleration when traveling over 60mph. Not speaker related. Not tire or wheel related.

Answer

Well I think the best thing to do next is your mechanic need double check these items.
The only faults I have had on this vehicle is wheel bearings,prop shaft,drive shaft and the diff..
I will have a check at work tomorrow and let you no..hopefully we can sort this problem out....

Thanks,mark

Expert:	mark
Pos. Feedback:	98.0 %
Accepts:	161
Answered:	12/4/2008

BMW Technician

Senior BMW technician,NVQ 3 CITY GUILDS 3 RTITB Level 3

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Question

Getting a low-frequency hum while under acceleration above 60mph. Car is a 2000 323it with manual transmission. Mechanic has checked wheel bearings and drive shaft, but found nothing. Thoughts?

Optional Information

2000 BMW 323it 6 Already Tried: BMW mechanic has checked wheel bearings, as well as the drive shaft and u joint. All are good.

Answer

Hi,Have you had the wheels and tyres checked, are you running normal size wheels.?Is the noise speed related or only one speed.?Does the noise happen only on one type of road surface.? Any more info will help. Thanks,mark

Reply

Stock wheels and tire size. Noise happens under acceleration at any speed above 60 and on any road surface. This is not an out-of-balance problem with the wheels and tires.

Info Request

Hi,When the noise is happening if you turn the steering left to right slightly does it make any differents.?Try pressing the clutch when the noise is present,to see if its a drive train fault.Has the centre prop shaft joint been checked.? Thanks,mark

Reply

Reply

Any other suggestions?

Answer

Reply

Mechanic did that as well, using a stethoscope. Apparently set the cruise on 70 in the process. I have asked him to order a guibo, even though I don't hear the "clicking". Other symptoms match what I understand are common when a guibo is failing. Thoughts?

Answer

Hi XXXXXXXXXXXXX,Not sure on what you mean by guibo.??Can you tell from what area the noise is coming from,Is it speaker related.?? Thanks,Mark

Reply

The guibo is the flexible coupler that joins the drive shaft and the rear of the transmission. Right? As mentioned previously, this is a humming noise coming from the drivetrain under acceleration when traveling over 60mph. Not speaker related. Not tire or wheel related.

Answer

Well I think the best thing to do next is your mechanic need double check these items.The only faults I have had on this vehicle is wheel bearings,prop shaft,drive shaft and the diff..I will have a check at work tomorrow and let you no..hopefully we can sort this problem out.... Thanks,mark

Related BMW Questions

2000 BMW 323it 6

Already Tried:
BMW mechanic has checked wheel bearings, as well as the drive shaft and u joint. All are good.

Hi,
Have you had the wheels and tyres checked, are you running normal size wheels.?
Is the noise speed related or only one speed.?
Does the noise happen only on one type of road surface.?

Any more info will help.

Thanks,mark

Hi,
When the noise is happening if you turn the steering left to right slightly does it make any differents.?
Try pressing the clutch when the noise is present,to see if its a drive train fault.
Has the centre prop shaft joint been checked.?

Thanks,mark

Hi XXXXXXXXXXXXX,
Not sure on what you mean by guibo.??
Can you tell from what area the noise is coming from,
Is it speaker related.??

Thanks,Mark

Well I think the best thing to do next is your mechanic need double check these items.
The only faults I have had on this vehicle is wheel bearings,prop shaft,drive shaft and the diff..
I will have a check at work tomorrow and let you no..hopefully we can sort this problem out....

Thanks,mark