Replacing Bulbs
944 / 944 S
944 Turbo To avoid short circuits, turn off the respective
electrical components when changing light
bulbs.
Keep bulbs free of grease and dirt. Hold
them only with a clean cloth or soft paper.
Do not use chemical cleaning agents on
the plastic lenses. Plastic lenses should
only be cleaned with water or a mild soap/
water solution.
We recommend that you have an assortment
of spare bulbs in the car.
When traveling abroad don't forget that some
countries require spare bulbs as part of the
safety equipment.
Front - Turn Signal Lights /
Parking Lights
1. Remove the Phillips screws from lamp lens
and remove lens.
2.
Push bulb into holder and twist to the left
(bayonet mount).
3.
Remove bulb.
4. Insert new bulb and turn to the right so that
it snaps into position.
5. Install lamp lens and tighten the retaining screws evenly, alternating from one to the
other.
Do not overtighten screws as this may
crack the lens.
6. Check lights.
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Front
Rear Rear - Turn Signal Lights /
Stop Lights / Parking Lights /
Back-up Lights
1. Open hatchback and unsnap carpeting.
2.
Remove knurled nut and take off bulb
holder
3.
Press defective bulb into socket and turn to
left (bayonet mount). Discard bulb.
4.
Press new bulb into socket, turn to right
until it snaps into position.
5.
Install bulb holder and tighten knurled nut.
6. Snap carpeting back in place.
Side Marker Lights
To change the bulb, open the flap at the front
of the plastic shell beneath the fender. The
rear housing is in the stowage well beneath
the mat.
1.
Unscrew knurled nut and remove the plastic cover.
2. Unclip lamp socket (arrow), remove
defective bulb and fit replacement (bayonet
mount).
3.
Clip socket into place and refit plastic cover. 4. Check that light is functioning correctly.
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How Emission Control Works
When an automobile engine is running, it uses energy generated through the combustion of a mixture of air and fuel. Depending on whether
a car is driven fast or slowly or whether the
engine is cold or hot, some of the fuel
(hydrocarbons) may not be burned completely but be discharged into the engine crankcase
or exhaust system. Additional hydrocarbons
may enter the atmosphere through
evaporation of fuel from the fuel tank. These
hydrocarbons (HC), when released into the
air, contribute to undesirable pollution.
In addition, carbon monoxide (CO) and oxides of nitrogen (NOx) contribute to engine
emissions. They, too, are formed during the
combustion process and discharged into the
exhaust system.
To reduce these pollutants, your Porsche is
equipped with a precisely calibrated fuel
injection system to assure a finely balanced
air/fuel mixture under all operating conditions.
Oxygen Sensor
The oxygen sensor, installed in the exhaust
pipe continuously senses the oxygen content
of the exhaust and signals the information to
an electronic control unit. The control unit
corrects the air/fuel ratio, so that the engine
always receives an accurately metered air fuel mixture. .
Crankcase Ventilation
Through Crankcase Ventilation undesirable
emissions from the engine crankcase are not
permitted to reach the outside atmosphere.
These emissions are recirculated from the
crankcase to the air intake system. From here
the emissions mix with the intake air and are
later burned in the engine.
Catalytic converter
The catalytic converter is an efficient
"cleanup" device built into the exhaust system
of the vehicle. The catalytic converter burns
the undesirable pollutants in the exhaust gas
before it is released into the atmosphere.
The exclusive use of unleaded fuel is critically important for the life of the
catalytic converter. Therefore, only
unleaded gasoline without additives must
be used.
The catalytic converter will be damaged by
push or tow starting your vehicle
misfiring of the engine turning off the ignition while the vehicle is moving or
by other unusual operating conditions.
Do not continue to operate your vehicle
under these conditions, as otherwise fuel
can reach the catalytic converter. This
could result in overheating of the
converter.
Federal law prohibits use of leaded
gasoline in this car.
The Emission Control System and its other
related components are illustrated and
described on the following pages.
101
Emission Control System
1 Fuel pump
2 Fuel filter
3 Pressure damper
3a Pressure regulator
4 Injector
5 Auxiliary air valve
6 Air flow meter
7 Throttle valve switch
8 Temperature sensor
9 Engine temperature sensor
10 Speed sensor
11 Reference mark sensor (TDC)
12 Control unit
13 Ring gear
14 Ignition coil
15 Distributor
16 Relay (fuel pump / control unit)
17 Oxygen sensor
18 Catalytic converter
19 Muffler
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