Manual Saab 9-5 - 2009 (page 144 of 272) (English)

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144 Starting and driving

Important

considerations for

driving

The engine-management system in the

Saab 9-5 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 driv-

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 in mid-range on temperature

gauge).

• A safety function prevents the engine

from revving faster than 6,000 rpm by

limiting the induction air.

2 Stopping the engine

• Do not rev the engine immediately

before switching it off – stop the engine

when it is idling.

3 Regulating the boost pressure

• One of the advantages of boost pres-

sure regulation is that the engine can

also be run safely on gasoline with a

lower octane rating, although not lower

than AON 87. However, engine perfor-

mance will fall slightly and heavy load-

ing and laboring should be avoided. For

optimum performance, use the recom-

mended grade of fuel.

• 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

perfectly 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.

NOTICE

• If the engine sounds strange there is a

fault in the system. Have the car

checked without delay by a workshop.

We recommend that you contact an

authorized Saab dealer.

• The use of fuel with too low an octane

rating can cause serious engine

damage.

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.

95_US_MY09.book Page 144 Tuesday, April 15, 2008 11:03 AM

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Saab 9-5 - 2009 Manual

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