Howling 996

[gareth]

I've posted this in the past, though need some more opinions / advice . . .

I have a 99' 996 AWD Tipronic . . . At any given speed I can hear a gradual howling / low pitched whining noise coming from the rear of the car. Here are the things I have done / inspected in my ongoing process of elimination -

1. Transmission & engine dropped and re-conditioned

2. Changed tires with correct size / pressure

3. Had bearings checked

My mechanic who works on german cars informs me that it is due to the drive train and the fact that most AWD cars have some wierd sounds? I somehow can't accept that as a final diagnosis . . Another mechanic told me to replace the transfer case, whatever that is?

Any opinions would be greatly appreciated.

[Jon996]

I've posted this in the past, though need some more opinions / advice . . .

I have a 99' 996 AWD Tipronic . . . At any given speed I can hear a gradual howling / low pitched whining noise coming from the rear of the car. Here are the things I have done / inspected in my ongoing process of elimination -

1. Transmission & engine dropped and re-conditioned

2. Changed tires with correct size / pressure

3. Had bearings checked

My mechanic who works on german cars informs me that it is due to the drive train and the fact that most AWD cars have some wierd sounds? I somehow can't accept that as a final diagnosis . . Another mechanic told me to replace the transfer case, whatever that is?

Any opinions would be greatly appreciated.

Actually, my C4S (manual) picked up a whining noise this summer. The mechanics at my dealer quickly identified it as two of the idler pulleys on the engine. Went away immediately and a pretty simple fix. Just a thought . . .

Edited January 5, 2009 by Jon996

[geoffbaltz]

Does the noise change with the car's speed or engine speed?

Wheel bearing?

[gareth]

I'll have my guy check that out and let you know - Thanks for the advice Jon.

I've posted this in the past, though need some more opinions / advice . . .

I have a 99' 996 AWD Tipronic . . . At any given speed I can hear a gradual howling / low pitched whining noise coming from the rear of the car. Here are the things I have done / inspected in my ongoing process of elimination -

1. Transmission & engine dropped and re-conditioned

2. Changed tires with correct size / pressure

3. Had bearings checked

My mechanic who works on german cars informs me that it is due to the drive train and the fact that most AWD cars have some wierd sounds? I somehow can't accept that as a final diagnosis . . Another mechanic told me to replace the transfer case, whatever that is?

Any opinions would be greatly appreciated.

Actually, my C4S (manual) picked up a whining noise this summer. The mechanics at my dealer quickly identified it as two of the idler pulleys on the engine. Went away immediately and a pretty simple fix. Just a thought . . .

[gareth]

Geoff. thanks for responding - The noise comes at any given speed, in any gear, perhaps more so in 4th to 5th . . . It's a deep humming noise, and often tends to be around the rear / drivers side . . . Is there anything I can do to the drive train to possibly alleviate the noise? That's if it is related to the drive train . .

Does the noise change with the car's speed or engine speed?

Wheel bearing?