Porsche 968 - Emission Control System and Driving Tips; Emission Control System Components; Driving Tips for Emission Control; Undersealing and Exhaust Precautions

Emission Control System
In conjunction with the lambda sensor and the
electronic control unit, the controlled three-way
catalyti c converter represents the most effective
emission control system.
To assure the efficiency of the emission control
system, always have your car serviced at the
specified intervals .
The system consists of several components :
•
the catalytic converter
• the lambda sensor
• the electronic control unit
• the tank ventilation system
To avoid permanent damage to the functiorr
ality of catalytic converter and lambda serr
sor, use only unleaded fuel.
The tank ventilation system prevents fuel va-
pours escaping from the tank into the atmos-
phere.
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Tips on Driving
Faults in the mixture formation system can
cause overheating and damage to the catalytic
converter.
For this reason, it is imperative that the following
points are observed.
• Avoid frequent and prolonged operation of the
starter motor if the engine does not start .
•
If backfiring occurs while driving (identifiable
by rough running of the engine or loss of
power), have the malfunction immediately
corrected at the nearest Official Porsche
Centre.
• Never drive until the fuel tank is completely
empty .
Undersealing
Do not apply additional undersea! or rust protec-
tion on or near the exhaust manifold, exhaust
pipes, catalytic converter or heat shields . With
the engine running, the protective material may
overheat and ignite.
Parking
Never park your car or run the engine where
there is a danger of flammable material such
as dry grass or leaves coming into contact
with the hot exhaust system.
Tow-starting
Cars with a catalytic converter should only be
tow-started or bump-started if the engine is cold .