Porsche 911 TURBO - 1975 WORSHOP, Manual

Page: 182 / 252

182
Maintenance, Car Care
Emission Control System
Closed-loop three-way catalytic converters,
combined with oxygen sensors and an electronic
control unit, represent the most effective emission
control system.
To ensure the efficiency of the emission control
system, always have your vehicle serviced at the
specified intervals.
To avoid permanent damage to the function-
ality of the catalytic converters and oxygen
sensors, use unleaded fuel only.
The fuel tank ventilation system prevents fuel
vapours from the tank entering the environment.
Tips on driving
Faulty preparation of the fuel/air mixture can
cause the catalytic converters to overheat and
can destroy them.
Warning!
Risk of damage to emission control system.
f Avoid frequent and prolonged use of the
starter if the engine does not start.
f If misfiring occurs while driving (identifiable by
rough running of the engine, loss of power or
an illuminated emission control warning light),
have the fault remedied immediately. Consult a
qualified specialist workshop. We recommend
a Porsche partner for this work as they have
trained workshop personnel and the necessary
parts and tools.
f Avoid high cornering speeds after the fuel-level
warning light lights up.
f
Never drive the tank dry.
f Tow-start or push-start the car only if the
engine is cold.
Cars equipped with “Tiptronic” cannot be
tow-started or push-started.
Risk of fire in the area of the exhaust system.
f Do not apply additional undersealing or rust
protection agent on or near the exhaust
manifolds, exhaust pipes, catalytic converters
or heat shields.
The protective material could overheat and
ignite while you are driving.
f Do not drive or park your vehicle where
combustible materials, such as dry grass or
leaves, can come into contact with the hot
exhaust system.