Manual Saab 9-3 - 2000 (page 136 of 236) (English)

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136 Starting and driving

Useful tips on cold climate starting

If the engine has failed to start after several

attempts in very cold weather, press and

hold the accelerator down to the floor and

run the starter for 5–10 seconds. This will

prevent the engine being flooded (exces-

sively rich fuel-air mixture).

Now start the engine in the normal way – do

not touch the accelerator.

If the engine stalls immediately after starting

(e.g. if the clutch was released too quickly),

do not touch the accelerator when restarting

the engine.

Every time the engine is switched off the

spark plugs are automatically cleaned. If

your attempt to start nevertheless fails, let

go of the ignition key and allow it to spring

back. This initiates more vigorous cleaning

of the sparking plugs which goes on for

about 5 seconds. Then start in the ordinary

way. Do not touch the accelerator; if the

accelerator is pressed to the floor the fuel

supply is shut off.

Important

considerations for

driving

The engine-management system in the

Saab 9-3 is called Saab Trionic T7. The

system manages the ignition, fuel injection

and turbo boost pressure.

The Trionic T7 system developed by Saab

is an intelligent engine-management

system designed to achieve optimum drive-

ability under differing driving conditions.

The system makes adjustments automati-

cally, for instance, if the car is being driven

at altitude (oxygen-deficient air), for differ-

ent grades of fuel (AON 87–93) and for dif-

ferent load conditions.

1 Starting and driving

• Refrain from using full throttle before

the engine has warmed up (before

needle is in the mid-range on tempera-

ture gauge) to avoid unnecessary

wear. If the needle of the pressure

gauge repeatedly enters the red zone

the engine may suddenly lose power,

owing to the intervention of a monitor-

ing system which curtails the charging

pressure. Get in touch with an autho-

rized Saab dealer at once.

• A safety function prevents the engine

from revving faster than 6,200 rpm by

temporarily shutting of the fuel injec-

tors.

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.

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Saab 9-3 - 2000 Manual

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