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Hi,

I have a 04 S, v8, 72k miles, that has a only what I can describe as a roar when driving. Sounds like all 4 wheel bearings are shot. The faster, the louder. The other day, I bumped it in neutral around 70 and let it coast down a hill. Oh, my! Nice and quiet. Only a little tire noise. I've been reading posts about the drive shaft and other posts about transfer case problems. Where to start?

Another little annoying thing it does, seems like when it's cold it really likes to start out in 1st gear and not 2nd. It only does it once and only first thing in the morning. Could this be the valve body problem I've read about?

Final question, my local Porsche shop told me that they can not view TSB history of a VIN. My BS dectector starting going off. Is this true? I would really like to know the history of my Cayenne.

Thanks,

Trey Cooper

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The drive shaft fault makes more of thumping noise. Does the sound change depending if you're accelerating or on overrun? If so I would check the condition of the differentials.

When cold the transmission is programmed to hold the shift points higher in the RPM band to reduce the heat up time of the catalytic convertors.

Your dealer should be able to verify what updates and or recalls were performed on your vehicle by the VIN number so long as the work was done at a OPC.

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The drive shaft fault makes more of thumping noise. Does the sound change depending if you're accelerating or on overrun? If so I would check the condition of the differentials.

When cold the transmission is programmed to hold the shift points higher in the RPM band to reduce the heat up time of the catalytic convertors.

Your dealer should be able to verify what updates and or recalls were performed on your vehicle by the VIN number so long as the work was done at a OPC.

like he said

about cold starts... the car is meant to hold first gear a little longer on cold starts to make the engine heat up a little faster and get the cats good and hot for emissions control. :renntech: B)

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The drive shaft fault makes more of thumping noise. Does the sound change depending if you're accelerating or on overrun? If so I would check the condition of the differentials.

When cold the transmission is programmed to hold the shift points higher in the RPM band to reduce the heat up time of the catalytic convertors.

Your dealer should be able to verify what updates and or recalls were performed on your vehicle by the VIN number so long as the work was done at a OPC.

Yes, it does sound different based on the load. Accelerating its loud. On a light throttle it's almost quiet. On deceleration (no throttle) it's back, but not as loud. I've learned how to play with the sound using the throttle. The last time I had it on a lift, nothing jumped out at me on the differentials. (but I was just looking in general)

On the transmission, that is what I figured. But glad to know for sure that this is normal.

I figured the service advisor was just being lazy.

Thanks for the help!

Trey

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On acceleration or de-acceleration the differential gears are being loaded differently, excessive noise is not normal and you need to get it inspected by qualified personal.

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I have the same noise (I think) I to have played with it, its not that bad, dont hear it whent he music is playing or at speed just around town when its quiet.

I was told not to mess with the front diff until it fails, not much can be done inside without a replacement on standby, $$. Noisy does not mean failing.

On acceleration or de-acceleration the differential gears are being loaded differently, excessive noise is not normal and you need to get it inspected by qualified personal.

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Just a quick update:

The roar finally got the best of me. I took it to my local Porsche dealer. After 2 days, they decided it was a front differential. cha-ching .... $3700. cursing.gif

Anyone know a good Porsche mechanic in the upstate of South Carolina?

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