Important Considerations For Driving - Cadillac BLS Owner's Manual

460_OM_MY09.book Page 129 Wednesday, April 2, 2008 10:32 AM
Important
considerations for
driving
Cars with turbo petrol engine
1 Starting and driving.
• Do not use full throttle until the engine
is warm, so as to avoid unnecessary
wear. If the needle of the turbo gauge
repeatedly enters the red zone, the
engine may suddenly lose power due to
the initiation of a monitoring system
that limits the boost pressure. We rec-
ommend that you contact an author-
ised Cadillac workshop immediately.
• Under certain barometric conditions
(high outside temperature and/or high
altitude) the needle may enter the first
part of the red zone without necessarily
indicating that a fault has arisen.
• A protective function (interruption of the
fuel supply) limits the engine speed.
2 Stopping the engine.
• Do not rev the engine immediately
before switching it off - stop the engine
when it is idling.
3 Boost pressure regulation.
• The system is optimised for RON 95,
but for 2.8 V6 RON 98 is used. One of
the advantages of boost pressure reg-
ulation is that the engine can also be
run safely on petrol with a lower octane
rating, although not lower than
91 RON, without damaging the engine.
However, engine performance will fall
slightly and heavy loading and
labouring should be avoided. For
optimum performance, use the recom-
mended grade of fuel.
• The maximum boost pressure is regu-
lated according to the tendency of the
engine to knock. Short-lived knocking
is perfectly normal. This can occur
when the engine is running at about
3000 rpm under a heavy load. The
extent of this knocking will depend on
the grade of fuel in the tank.
• Isolated instances of knocking can
occur with low-octane fuel. This con-
trolled form of knocking, followed by a
reduction in the boost pressure, is a
sign that the control system is working
normally, and is perfectly safe for the
engine.
Starting and driving
NOTICE
• If the engine sounds strange there is a
malfunction. We recommend that you
contact an authorised Cadillac work-
shop.
• The use of fuel with too low an octane
rating can cause serious engine
damage.
Limited performance.
The light 3 comes on in the event of an
engine or gearbox fault (cars with automatic
gearbox), which can cause driveability
problems but does not affect exhaust emis-
sion. The car can still be driven but perhaps
with limited performance.
Contact a workshop when you find it suit-
able. We recommend that you contact an
authorised Cadillac workshop.
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