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Owner's Manual Cadillac BLS - IFS Europe BV

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460_OM_MY09.book Page 129 Wednesday, April 2, 2008 10:32 AM<br />

Important<br />

considerations for<br />

driving<br />

Cars with turbo petrol engine<br />

1 Starting and driving.<br />

• Do not use full throttle until the engine<br />

is warm, so as to avoid unnecessary<br />

wear. If the needle of the turbo gauge<br />

repeatedly enters the red zone, the<br />

engine may suddenly lose power due to<br />

the initiation of a monitoring system<br />

that limits the boost pressure. We recommend<br />

that you contact an authorised<br />

<strong>Cadillac</strong> workshop immediately.<br />

• Under certain barometric conditions<br />

(high outside temperature and/or high<br />

altitude) the needle may enter the first<br />

part of the red zone without necessarily<br />

indicating that a fault has arisen.<br />

• A protective function (interruption of the<br />

fuel supply) limits the engine speed.<br />

2 Stopping the engine.<br />

• Do not rev the engine immediately<br />

before switching it off - stop the engine<br />

when it is idling.<br />

3 Boost pressure regulation.<br />

• The system is optimised for RON 95,<br />

but for 2.8 V6 RON 98 is used. One of<br />

the advantages of boost pressure regulation<br />

is that the engine can also be<br />

run safely on petrol with a lower octane<br />

rating, although not lower than<br />

91 RON, without damaging the engine.<br />

However, engine performance will fall<br />

slightly and heavy loading and<br />

labouring should be avoided. For<br />

optimum performance, use the recommended<br />

grade of fuel.<br />

• The maximum boost pressure is regulated<br />

according to the tendency of the<br />

engine to knock. Short-lived knocking<br />

is perfectly normal. This can occur<br />

when the engine is running at about<br />

3000 rpm under a heavy load. The<br />

extent of this knocking will depend on<br />

the grade of fuel in the tank.<br />

• Isolated instances of knocking can<br />

occur with low-octane fuel. This controlled<br />

form of knocking, followed by a<br />

reduction in the boost pressure, is a<br />

sign that the control system is working<br />

normally, and is perfectly safe for the<br />

engine.<br />

NOTICE<br />

Starting and driving<br />

129<br />

• If the engine sounds strange there is a<br />

malfunction. We recommend that you<br />

contact an authorised <strong>Cadillac</strong> workshop.<br />

• The use of fuel with too low an octane<br />

rating can cause serious engine<br />

damage.<br />

Limited performance.<br />

The light 3 comes on in the event of an<br />

engine or gearbox fault (cars with automatic<br />

gearbox), which can cause driveability<br />

problems but does not affect exhaust emission.<br />

The car can still be driven but perhaps<br />

with limited performance.<br />

Contact a workshop when you find it suitable.<br />

We recommend that you contact an<br />

authorised <strong>Cadillac</strong> workshop.

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