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The 911 | Engine
911 Targa 4S
high engine speeds and loads.
The onboard diagnostics, which
are compliant wi th European
standards, ensure timely detection
of any faults and defects th at
may occur in the exhaust and fuel
systems and notify the driver
immediately. This also prevents
increased pollutant emissions and
unnecessary fuel consumptio n.
Servicing.
Every Porsche is designed with
longevity in mind, and the 911
is no d ifferent. T he alternator,
power-steering pump and the
air-conditioning comp ressor
are all driven by a single self-
adjusting belt. Hydraulic valve-
cle arance compensation makes
valve-clearance adjustment
unnecessary. The drive chains
on the camshafts do not re quire
servicing. W ith the sole exception
of the spark plugs, the ignition
system i s also maintenance-
free. This all adds up to long
maintenance intervals.
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