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I'm getting a weird buzzing noise (buzz/whine) when above 4000 RPM. It's a 997S 1st gen no mods, with about 70k on it. It sounds a bit like the car is struggling at anything past 4000 RPM.. It happens in gear and in neutral. When its hot and cold. if anyone has any ideas of parts I should look at, that may be causing this, please let me know! I'll post a video of the sound in the next couple of days too, so you can hear what it sounds like. Thanks a lot!
Is there a "shadetree" method to determining if the resonance flap on the 996 intake is opening at the correct RPM? I can test the solenoid that triggers the vacuum but I want to know if the flap is actually opening @ the correct RPM.
Hello all, I have been lurking around here for almost 2 years. I have a 2006 Cayenne S with automatic transmission with about 70,000 miles. This morning I went to drive it to the car wash. When I went to accelerate onto the autobahn the engine acted as if it were in limp mode. There was no power under load above 3,500 RPM. In neutral the engine will not rev past 4200 RPM. Here is what it is not doing or has been replaced - It starts and idles fine. - plugs and coils replaced last year less than 10 thousand miles ago. - I do not have a check engine light on. I am thinking: 1. MAF sensors (looks like a special tool required for replacement). 2. Throttle position sensor 3. Fuel Filters 4. Fuel Pumps 5. Or another sensor related to fuel pressure or fuel regulation/delivery system. Does anyone have any trouble shooting tips or advice before I give up and take it to the dealer?