Manual Saab 9-3 - 2002 (page 149 of 256) (English)

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149Starting and driving

2 Stopping the engine

• Do not rev the engine immediately

before switching it off - stop the engine

when it is idling.

3 Regulating the charging pressure

• The system is optimized for fuel with an

octane rating of AON 90. For cars with

205 hp engines and the Viggen, the

system is optimized for 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. However, engine perfor-

mance will fall off slightly, and heavy

loading should be avoided. For best

performance you should use the rec-

ommended grade of fuel, AON 90

(205 hp engine and Viggen AON 93).

• 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.

Saab 9-3 Viggen: The Saab 9-3 Viggen has

a high-performance engine which means

that a certain amount of care should be

exercised, in particular when accelerating in

the lower gears. This is especially important

when the road surface is slippery to avoid

the driving wheels from losing their grip.

Limp-home

The car’s engine management system has

a diagnostics function that, once the engine

has been switched off, checks a number of

internal functions. If a throttle valve fault is

detected, the engine management system

will initiate limp-home mode for the valve.

This means, for example, that idling speed

regulation will be impaired, the cruise con-

trol system will be inoperative, and the

capacity of the A/C compressor will be lim-

ited.

When starting the car in limp-home mode at

temperatures below 32°F (0°C), depress

the accelerator slightly.

If the diagnosis function detects any faults in

the engine management system, the

“Engine malfunction (CHECK ENGINE)

“ indicator in the main instrument panel

will light up (see page 63). The car should

be checked as soon as possible at an

authorized Saab dealer.

NOTE

If constant knocking occurs every time a

load is put on the engine, this indicates a

malfunction in the system.

Have the car checked without delay by an

authorized Saab dealer.

NOTE

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.

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Saab 9-3 - 2002 Manual

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