Cloud of smoke indicates a bad AOS. To check it, remove the oil filler cap with the engine running, seal off the opening with your hand, you should feel just the slightest vacuum. If there is substantial vacuum, then its likely a bad aos.
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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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