Manual Saab 9-5 - 2003 (page 156 of 288) (English)

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156 Starting and driving

AON 93. One of the advantages of the

system is that it enables the engine to

be run safely on lower-grade fuel,

although not lower than AON 87.

• The maximum boost pressure is

adjusted automatically to the knocking

or pinging tendency of the engine.

Occasional, short-lived knocking when

the engine is under a heavy load is per-

fectly normal; the extent will depend on

the grade of fuel in the tank.

• Isolated instances of knocking are

more likely to occur with low-octane

fuel. This controlled form of knocking,

followed by a reduction in the boost

pressure, is a sign that the wastegate is

functioning and is perfectly safe for the

engine.

Important considerations with cata-

lytic converters

The catalytic converter is an emission-con-

trol device incorporated in the car’s exhaust

system. It consists of a metal canister with a

honeycomb insert, the cells of which have

walls coated in a catalytic layer (mixture of

precious metals).

To ensure that the catalytic converter con-

tinues to function properly, and also to avoid

damage to the converter and its associated

components, the following points must be

observed:

• Have the car serviced regularly in accor-

dance with the service program. The fuel

and ignition systems are particularly

important in this context.

• Always be alert to any misfiring of the

engine (not running on all cylinders) and

any loss of power or performance. At the

first sign of a malfunction, reduce speed

and take the car to an authorized Saab

dealer as soon as possible.

• If the engine fails to start (in very cold

weather or if the battery is flat), the car can

be push started (manual gearbox only) or

started using jumper cables to a donor

NOTICE

• If the engine sounds strange there is a

fault in the system. Have the car

checked without delay by an autho-

rized Saab dealer.

• The use of fuel with too low an octane

rating can cause serious engine dam-

age.

WARNING

If the engine is being run with the car on a

rolling road or dynamometer, longer than

for a standard state emission inspection,

to ensure adequate cooling, air must be

blown into the engine compartment and

under the car at a rate equivalent to the

ram-air effect that would be obtained at

the corresponding road speed.

NOTICE

Use only unleaded gasoline. Leaded gas-

oline is detrimental to the catalyst and

oxygen sensor and will seriously impair

the function of the catalytic converter.

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Saab 9-5 - 2003 Manual

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