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My guess is that my hearing was not sensitive enough to notice a difference. But the difference of before vs after is unmistakable.by shackledtodesk - Main Forum
And the answer is engine and transmission mounts. Front mount had obvious cracking in the rubber. The transmission mounts had nothing visibly wrong, but after only replacing the front, there was no real change in the issue. Replacing the rears, things are now significantly improved. There's still some slight vibration/droning, although, almost unnoticeable and that's probably a result of theby shackledtodesk - Main Forum
Sounds and symptoms appear regardless of being in motion or a standstill. Doesn't matter if the car is in gear or not. Symptoms don't seem to change whether the engine is cold (fresh start) or already warmed up. Possibly actually worse when warmed up. There is no RPM change, I can hold a constant RPM in that range without adjusting the gas pedal. There is some valve train noise that is moreby shackledtodesk - Main Forum
Yes, I cleaned the throttle body when I changed the AOS. It's at the shop now.by shackledtodesk - Main Forum
My '06 Cayman S (~72.5k miles) has a rough running spot between 1800 and 2200 rpm. While there's no perceptible power loss, the noise is a bit disconcerting. The best way I can describe it is like when someone cracks open a window in a sedan going down freeway speed. There is a low pitched reverberation that is not there at idle or above 2500 rpm. It doesn't matter whether the car is under loby shackledtodesk - Main Forum