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.
1991 Saab 900 SPGFACTORY OEM SERVICE PROCEDURE
Quick Check
- Measure voltage at Red wire going into ignition cartridge. With ignition on, voltmeter should indicate battery voltage.
- Turn ignition off. Remove No. 14 fuse (fuel pump). Remove ignition cartridge and spark plugs. Install spark plugs into ignition cartridge. Using jumper wires, connect negative electrodes of spark plugs together. Ground other ends of 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 occur at spark plugs.
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.