[Seadweller]

Trying to help a computer illiterate buddy of mine with his '00 Boxster. He's been telling me about a vibration that comes and goes, and I was beginning to think he was sniffing glue until the other day when I was in the car with him. Sitting at a light, he said "there it is, there it is," and I can say is that it was certainly noticeable.

It's a base car with tip, less than 60K miles. IMS was done around 2 years ago. It was idling perfectly at a light, and then what I would call a cyclical vibration started. No change in RPM's, no CEL, nothing, just a strong, cyclical vibration that you can almost hear, but definitely feel. Leaving the light, the car ran perfectly.

Any clue what this might be?