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 MANUALSSAAB1990900 S, 2D HATCHBACK, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - TESTS W/O CODESENGINE WON'T START
1990 Saab 900 S, 2D Hatchback, Automatic
Engine Won't Start
1990 Saab 900 S, 2D Hatchback, AutomaticSECTION Engine Won't Start
- Ensure electrical harness, connectors and wires are not broken or loose. Ensure battery voltage is at least 11.5 volts. Check system relay and fuel pump relay. On turbo models, check pressure switch. Check all ECU input signals.
- Ensure fuel pump is operating. Check fuel pressure and pressure regulator. Check for leaks or restrictions.
- Check injector operation and opening duration. Check for leaks.
- Check induction system. Check for air leaks downstream of throttle valve, using pressure tester. Visually inspect between mass airflow meter and throttle housing.
- Check coolant temperature sensor operation.
- Check auxiliary air valve for leaks and proper operation.
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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.