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2 engine failures possibly from unstable valve-control system


Vehicle Information: Year: 1999; Engine (type, size, modifications): second replacement engine, by dealer; Total Mileage: 48K;

At 3500rpm I feel a rough, flabby, fluttering vibration in my hands while steering, in my feet on the pedals, and in my rear in the seat. I can hear it as well, but it is not very loud. A few hundred rpm either way and the vibration ceases. Could this be evidence of an instability in the valve-control system? I have had two engine failures requiring replacement engines, one at 6500 miles in city work traffic in 2nd gear at 4500 rpm, the second at about 46000 miles at constant 50mph in 3rd @ 3500rpm. I am concerned that the valve-control system in my Boxster is responsible for the two engine failures, and it is just a matter of time before it kills the third engine. Is this a reasonable hypothesis? I'd like to learn about details of the valve control system. Please suggest a source.

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