Unsure of how to measure for collapse, as I have no data for good mounts to compare to. Engine is tuned. I get a slightly rough idle, but as soon as engine is spinning above idle, it goes away. Torqueing the engine at a stop eliminates the roughness. I suspect that if it is bad motor mounts, torqueing the engine is lifting it clear of any hard contact points. I had thought of lifting the engine as Ethan suggests to ensure it was not resting against the frame. Good idea, I will try that. I will also look for oil leaks, but if I remember correctly, it was very dry last time I was under the car. The car has 120K on it, and I do not know if the previous owner ever changed mounts. I think I'll change them. Are there any special precautions I should take when changing them, or is it a straight-forward job?

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1995 S600, 1 of 618 (sold)

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