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What is wrong, if anything?
Sometimes when I am driving my 986 2.7, there is a sudden loud vibration coming from behind me. I thought that the wind deflector was just shaking more than usual, but when I held the wind deflector down in place, the noise was still there, so that was not it.
When I step on the clutch or put it in neutral, it stops. This rarely happens. Does anyone know what it could be?
FYI: I have the check engine light on for the secondary air system like most Boxsters get sometime in their life. I plan to replace the cut-off valve when I make the money. But I doubt that has anything to do with the vibration. No other CIL codes or warning lights. Wheels are on tight. Tires are in great shape.
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