Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSSAAB20009-3 CONVERTIBLE (9400) L4-2.0L TURBO (B205)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTIGNITION SYSTEMIGNITION TIMINGDESCRIPTION AND OPERATIONSTARTING IGNITION TIMING
2000 Saab 9-3 Convertible (9400) L4-2.0L Turbo (B205)
Starting Ignition Timing
2000 Saab 9-3 Convertible (9400) L4-2.0L Turbo (B205)SECTION Starting Ignition Timing
Starting ignition timing is active from the point when the engine starts until the engine speed has reached the requested idling speed.
Ignition timing is normally 10° BTDC but is retarded when the intake air temperature exceeds 4 °C. When the intake air temperature reaches 100 °C, the ignition advance will be 3 ° BTDC. The reason for the ignition being retarded when the air temperature increases is that then the combustion velocity also increases.
When starting, the control module will trigger each cylinder with 200 Hz during 60 crankshaft degrees to provide a so-called multispark. The frequency is increased to 330 Hz once the engine speed exceeds 450 rpm. This function ceases when the engine speed exceeds 650 rpm. The function will restart if the engine speed drops below 450 rpm again.
This is to ensure ignition in unfavorable starting conditions and to prevent the engine from stalling directly after start.
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.