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.
1978 Subaru GF Automatic TransFACTORY OEM SERVICE PROCEDURE
System Spark Check
- Turn ignition off. On 1979 Datsun 6-cylinder engines, disconnect EFI fusible link, 35-pin connector, and cold start valve harness connector. On 4-cylinder engines, disconnect anti-dieseling solenoid valve connector. This cuts off fuel supply to engine.
- On all models, disconnect high tension cable from spark plug. Hold cable about 1/4" (6 mm) from engine block. Crank engine and check for sparks at cable-to-block gap.
- If spark occurs, ignition system is okay. No further ignition checks are required. If no spark occurs, check high tension cables, wiring harnesses, distributor cap and rotor. Replace components as necessary. If okay, perform POWER SUPPLY CIRCUIT CHECK .
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.