Question about Cars & Trucks
Dear Sir, I have a Porsche Cayenne 2004. Lately, there is an abnormal noise coming the under carriage and definitely from those mounting. The noise is obvious after the car runs hot after 5-10 minutes. It can be hear clearly at about 40 mph when releasing the fuel pedal slightly, sounds like coming from the gear assembly from differential or transfer case. I requested the mechanic to confirm all the hub bearings, they are all ok. Neither it's from the tyres sound. The sound is obvious when the vehicle loaded and sound varies with vehicle load. Any advice please. Tks. Regards, Yeo K email@example.com
Posted by Anonymous on
A noise from a diff are , normally a high frequency harmonic sound while driving is from diff pinion bearings
if you decelerate and you get a noise normally as a low grumble ( low drumm noise )to a frequency noise is again the diff pinion bearings
you can distinguish the noise from power on to deceleration
the noise can be most noticeable with a slight load ( 2 people travelling at a steady speed say 60- 80 klm/hr) as a steady but harmonic pitch variation
the noise varies as the load is transferred from the bearing immediately behind the pinion gear to the bearing immediately behind the drive flange or in your case driven gear from the gear box
it is caused by a slight movement of the pinion which varies the correct mesh with the crown wheel , resulting in the whining sound
sorry but noise sounds are very hard to describe
Posted on Apr 15, 2017
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Posted on Jan 02, 2017
let me tell you it is the valve body in the trans do get it replaced has soon has possible before major damge hapens , i change a few per month . as a porsche tech i see them all the time , i even had same problem on my toureg , they had to replace complete trany , lucky was under waranty , they share the same trany , also note coils on cayenn do go bad also sugest to replace before coil burns out plug or engine harness .
Posted on Jan 20, 2009
check the fuses for one blown. i'm guessing that has premium sound which has an amplifier. i've had it happen a few times where the radio works and no sound.
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Posted on Sep 03, 2009
It's likely the fuse. The fuse diagram is in your owners manual. The fuse box is on the side of the dash when you open your driver's door. That should solve your issue.
Posted on Jan 12, 2010
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