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.
1990 Geo Metro Base, 2D Hatchback, AutomaticFACTORY OEM SERVICE PROCEDURE
Ignition Coil Resistance
- Remove protective coil cap and disconnect secondary wire from coil. Remove primary wires from ignition coil. Using ohmmeter, check resistance between primary terminals of coil.
- Check secondary resistance between coil secondary terminal and primary positive terminal. Replace coil if readings are not within specifications. See IGNITION COIL RESISTANCE table.
HIGH TENSION WIRE RESISTANCE
| Application | Ohms Per Foot |
|---|---|
| All Models | 3,000-6,500 |
NOISE FILTER/SUPPRESSOR RESISTANCE
| Application | Ohms |
|---|---|
| Metro | 2,200 |
IGNITION COIL RESISTANCE - Ohms @ 68°F (20°C)
| Application | Primary | Secondary |
|---|---|---|
| Metro | 1.30-1.50 | 10,700-14,500 |
Factory Service Tools
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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.