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My understanding is that the cam timing was not very accurate straight from the factory, so unless you checked it when the car was new, hard to say if its because of component wear.
Insite (?) has a great write up for adjusting cam timing that reqires no special tools except for a bolt to pin the crank at TDC.
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Current car
2000 Boxster 2.7l red/black
Previous cars
1973 Opel Manta
1969(?) Fiat 850 Convertible
1979 Lancia Beta Coupe
1981 Alfa Romeo GTV 6
1985 Alfa Romeo Graduate
1985 Porsche 944
1989 Porsche 944
1981 Triumph TR7
1989 (?) Alfa Romeo Milano
1993 Saab 9000
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