owners manual Saab 9-5

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152 Starting and driving AON93. One of the advantages of the WARNING Important considerations with cata- system is that it enables the engine to lytic converters be run safely on lower-grade fuel, If the engine is being run with the car on a although not lower than AON 87. rolling road or dynamometer, to ensure NOTE • The maximum boost pressure is adequate cooling, air must be blown into Use only unleaded gasoline. Leaded gas- adjusted automatically to the knocking the engine compartment and under the oline is detrimental to the catalyst and or pinging tendency of the engine. car at a rate equivalent to the ram-air oxygen sensor and will seriously impair Occasional, short-lived knocking when effect that would be obtained at the corre-the function of the catalytic converter. the engine is under a heavy load is per-sponding road speed. fectly normal; the extent will depend on the grade of fuel in the tank. The catalytic converter is an emission-con- • Isolated instances of knocking are trol device incorporated in the car’s exhaust more likely to occur with low-octane system. It consists of a metal canister with a fuel. This controlled form of knocking, honeycomb insert, the cells of which have followed by a reduction in the boost walls coated in a catalytic layer (mixture of pressure, is a sign that the wastegate is precious metals). functioning and is perfectly safe for the To ensure that the catalytic converter con- engine. tinues to function properly, and also to avoid damage to the converter and its associated NOTE components, the following points must be observed: If constant knocking occurs every time a • Have the car serviced regularly in accor- load is put on the engine, this indicates a dance with the service program. The fuel malfunction in the system. and ignition systems are particularly Have the car checked without delay by an important in this context. authorized Saab dealer. • Always be alert to any misfiring of the engine (not running on all cylinders) and any loss of power or performance. At the first sign of a malfunction, reduce speed and take the car to an authorized Saab dealer as soon as possible. • If the engine fails to start (in very cold weather or if the battery is flat), the car can be jump started (manual gearbox only) or started using jump leads to a donor bat-

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