Join Date: Feb 2019
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Odd front vibration, off and on
I have an 04 Cayenne Turbo and have been having an odd issue with it spanning roughly 2 years now. 99.9% of the time, it is perfect, noise free, vibration free, except when I hit a puddle on the passenger side! Literally, I hit a large puddle, and then I hear a loud knocking and vibration from the front pass side.
What I have done/inspected so far-
Took front suspension apart. All ball joints, all bushings, all axles tight and no play in them. Drained front diff oil, and while smelling burned (105k miles) there was bairily any metal particles. Replaced with Royal Purple synthetic. Axle stubs had hardly any play also, so I highly doubt carrier bearings are bad.
Center driveshaft bearing still intact. I filled the void with poly to wart off future problems.
All of the electrical connectors I have packed with dialectric grease incase it was shorting a sensor. There has been zero ses lights or warnings.
So that's where I am at, and running out of things to check that make sense. It is definitely vibrating at wheel speed. Once it starts, I have to pull over, stop, wait just a few seconds, and then I am fine again until the next big puddle. I recently took a 300 mile trip in very heavy rain. I had to stop 5 times to "reset" the vibration. Then, on the last 150 miles, I just kept above 70mph and never had to stop again and it hasn't been back.
I have been working on and building cars for over 30 years, but this one has me stumped. It sucks when your "rain" vehicle can't drive in the rain!
Any help is appreciated or ideas of where to look next.