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Well, thanks all. Let's close the thread. Fact is, as one of you hints, I do not belong here. Am a boatbuilder/novelist who likes to understand physical things, not an engineer. Have learned a little about disgnostics from you all. I am not really any closer to understanding my vibration but may...

cardoc, would it be possible for a driveshaft, turning at one rpm, to whip eccentrically at another rpm? Mason Smith www.adirondackgoodboat.com

cardocs give me homework to do, diagnosing this vibration problem. but for now, in answer to your questions, cardoc: Observed this problem from the first of my ownership of the car until now. Speed range to be more carefully observed, but noticed at all normal driving speeds, say from 45 to 75...

I didn't reply to Zapster by name in my last. Meant to. Zapster, would your notion of a sympathetic vibration explain the periodicity? I think in a noisier car one might not notice this vibration at all. But most drivers, not including my wife, do notice this one. And if it weren't periodic...

Thanks, Pat and Greg. I have of course considered the flat spots. But I wonder if we aren't overemphasizing my observation that it's worse after a cold sitting-period, because, for example, last night my son (also a driver of the car, who has noticed the vibration) and I were driving for 25...

What might be the cause of a periodic low-frequency vibration in a car. The vibrations sound a bit like muffled wind-buffeting, on the edge of being unnoticed, and pausing every second or so. The frequency does not change; the vibration just comes and goes. Can be felt, just barely, in the...