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, 4D SEDAN, STANDARDREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - BASIC TESTINGIGNITION CHECKSDIS IGNITION SYSTEMQUICK CHECK
1990 Saab 900 S, 4D Sedan, Standard
Quick Check
1990 Saab 900 S, 4D Sedan, StandardSECTION Quick Check
- Remove No. 14 fuse (fuel pump). Remove ignition cartridge and spark plugs. Install spark plugs in ignition cartridge. Using jumper wires, connect negative electrodes of spark plugs together and ground jumper wires.
- With ignition key, crank engine and observe tachometer. Needle of tachometer should hunt. Ensure there is spark at all spark plugs. Release ignition key to RUN position for approximately 5 seconds. Ensure tachometer needle hunts and multiple sparks at spark plugs are observed.
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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.