Porsche 928 S 1986 Driver Manual page 69

Starting the Engine
The same rules apply to starting as for a
Porsche without emission control system.
Temperature-controlled components on the
engine automatically guarantee the correct
mixture composition required for starting.
Therefore, do not depress the accelerator
either when the engine is cold or when it is
warm.
At low temperatures, it is advisable - even with
the gearbox in neutral - to fully depress the
clutch pedal while starting.
If the engine fails to start after 10 to 15
seconds, wait approx. 10 seconds before
trying again.
At temperatures below - 2 5 ° C it is advisable
to assist the engine to accelerate when cold-
starting by continuing to operate the starter
motor beyond the first few signs of firing of the
engine.
Do not warm up the engine with the vehicle
standing. Drive away immediately. In the first
5 minutes avoid engine speeds above 4500
rpm.
Do not start or run the engine in enclosed
spaces.
Tips on Driving
In normal vehicle operation, there is no dif-
ference from the vehicle without an emission
control system.
Should backfiring occur while driving, reduce
speed. The fault should be remedied imme-
diately at the nearest Porsche garage.
If the battery is insufficiently charged, the en-
gine can be started by jump leads or by towing.
Note:
The vehicle may be started by towing only
with the engine cold.
With the engine warm, there may be damage
to the catalytic converter. Unburned fuel may
reach the catalytic converter and burn there,
leading to overheating and destroying the cat-
alytically active surface.
Underseal
Do not apply any additional underseal or rust
protection on or near the exhaust manifold,
exhaust pipes, catalytic converter or heat
shields. The protective material may overheat
while driving and ignite.
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