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Humming / howling noise getting louder

gareth
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gareth Member

gareth

Posted
Posted

Hello, hope someone can help out a little . .

I have a 99' 996 C4 tiptronic , and it seems to have a gradual loud humming / howling noise upon applying the accelerator, especially in 4th and 5th gear (any speed really), if I step off the gas it completely goes away . . . The noise is coming from the driverside, at the back of the car, around the wheel / transmission / drivetrain area . . I don't think it's anything to do with the wheel, I beleive it to be related to the trans or drivetrain . . . Any ideas? I feel it's becoming worse, and something bad is going to happen . . . Also, when I get out of the car, I smell transmission oil strongly, though there are no leaks whatsoever.

Thank you all indeed.

Gareth

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RFM Member

RFM

Posted
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Posted

Check the differential oil level on the tiptronic, can be a small leak on the seal of the transmission axle left or right. I hope it's not to late.

gareth Member

gareth

Posted
  • Author
Posted

Check the differential oil level on the tiptronic, can be a small leak on the seal of the transmission axle left or right. I hope it's not to late.

I appreciate your response - Another guy mentioned that to me also . . . When you say, "I hope it's not too late . . " You mean? Go easy on me . . . Thanks in advance for your advice.

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RFM Member

RFM

Posted
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Posted

The smell of transmission oil in combination with this kind of noise makes me nervous, if i was you i would take a look A.S.A.P.

gareth Member

gareth

Posted
  • Author
Posted

The smell of transmission oil in combination with this kind of noise makes me nervous, if i was you i would take a look A.S.A.P.

How do I take a look? Do you suggest going to a dealer? Or something I check myself? Of course, it makes me nervous also, but what are various fix scenarios, or am I in BIG trouble either way? What do you think the dealer would suggest to troubleshoot? Would they haveto drop the trans & engine?

Thanks again for the follow up!

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RFM Member

RFM

Posted
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Posted

There is one inspection/filling hole in the aluminium housing of the Z.F. differential, you can open it with an alan key, you have to fill till the oil comes out this is the filling level.

If it is too difficult go to the dealer or independent.

gareth Member

gareth

Posted
  • Author
Posted

There is one inspection/filling hole in the aluminium housing of the Z.F. differential, you can open it with an alan key, you have to fill till the oil comes out this is the filling level.

If it is too difficult go to the dealer or independent.

Hey RFM,

Thanks for staying with me on this, I sincerely appreciate it . . . What do you think the dealer will charge $$ / tell me? What is worst case scenario here? Thank YOU

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RFM Member

RFM

Posted
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Posted

I dont no what the charge is in the US, it takes approx. 1 hour to check/tip up the level and a test drive done by a mechanic. After the run they can tell you the result of there findings, in cases like this it is to difficult to give a solution without seeing and driving the car.

gareth Member

gareth

Posted
  • Author
Posted
I dont no what the charge is in the US, it takes approx. 1 hour to check/tip up the level and a test drive done by a mechanic. After the run they can tell you the result of there findings, in cases like this it is to difficult to give a solution without seeing and driving the car.

Thanks RFM, I shall take it to the dealer this week, and let you know the outcome - Thanks again for the advice.

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