OK, probably the last thing I now feel needs to be adressed on my "new" 9-7X is this annoying buzz I'm getting through the gas pedal...
It seems to me that somewhere around 1700 - 1900 RPM the I6 has some kind of resonant frequency and that it's most noisy in this range. That might be natural and normal but I have a bonus in the form of unsolicited foot massage through the gas pedal. It seems to be most apparent in lower speeds, under light and steady acceleration (1900 on the highway usually means a lot more wind noise & foot off the gas pedal, because cruise control). The thing is that no physical vibration can be felt on other places... floor, dashboard, center console. Also, in some specific cases (3rd or 2nd gear, steady acceleration, just before upshift) I can hear a brief metal-to-metal rattle from under the car, like two metal pieces vibrating against each other.
I have repeatedly checked engine and trans mounts and they seem to be intact. No tears, no damage. Maybe the rubber may have already become worse but that would result in more ubiquitous vibration, not just pedal buzz, I believe.
I've read on the OS that it might be the heat shield between the trans and the exhaust or that it could be some metal lines being too close to something. Next week I plan to have my wife sit in the car, slowly going up with RPM and me playing cat & mice with sounds and vibrations under the car... I can only do that in P and maybe N, though
Any other tips and places to look? And please don't tell me it's inside the trans
I was expecting the I6 to be a very smooth powertrain so this is kinda annoying, even though it's probably not a life-death issue.
It seems to me that somewhere around 1700 - 1900 RPM the I6 has some kind of resonant frequency and that it's most noisy in this range. That might be natural and normal but I have a bonus in the form of unsolicited foot massage through the gas pedal. It seems to be most apparent in lower speeds, under light and steady acceleration (1900 on the highway usually means a lot more wind noise & foot off the gas pedal, because cruise control). The thing is that no physical vibration can be felt on other places... floor, dashboard, center console. Also, in some specific cases (3rd or 2nd gear, steady acceleration, just before upshift) I can hear a brief metal-to-metal rattle from under the car, like two metal pieces vibrating against each other.
I have repeatedly checked engine and trans mounts and they seem to be intact. No tears, no damage. Maybe the rubber may have already become worse but that would result in more ubiquitous vibration, not just pedal buzz, I believe.
I've read on the OS that it might be the heat shield between the trans and the exhaust or that it could be some metal lines being too close to something. Next week I plan to have my wife sit in the car, slowly going up with RPM and me playing cat & mice with sounds and vibrations under the car... I can only do that in P and maybe N, though
Any other tips and places to look? And please don't tell me it's inside the trans
I was expecting the I6 to be a very smooth powertrain so this is kinda annoying, even though it's probably not a life-death issue.