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3.2L V6 One sided "rattle" above 3000 rpm


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I have a 2004 Cayenne, automatic transmission is fine, fuel consumption absolutely fine, no real strange noises. Unless you go beyond 3000 rpm.

When stationary and revving beyond 3000 rpm a rattle/not so normal noise is heard only on the driver side of the engine.

I read posts about replacing the upper tensioner (using a 3.2 V6 VW Touareg part which is cheaper). Does anyone have any experience with this? Car was sluggish a while back and got 6 new spark plugs which made it run as before, just the problem above 3000 rpm that occured since. I have only driven a couple hundred miles with this noise now any advice would be welcomed. As I said I have not noticed it unless I go above 3000 rpm, fuel consumption has remained the same, no warning lights or error codes. My local garage "read" the car and no error codes were displayed and nothing could be found apart from this typical noise.

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It is not a US car, I am based in the Netherlands, Europe.

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I had a good listen and look this weekend, its better to hear when the engine is just started and cold. And once the engine is warm its easy to hear when you go above 3000 rpm. But only on the driverside of the engine.

Could a fuse affect 3 cylinders or is this more a case of a chain tensioner? I have no loss in mpg, it also drives normal and goes smooth on the highway (70-80 mph / 120 kmh).

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