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 MANUALSTOYOTA1979PICKUP SR5REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCEIGNITION SYSTEMSPARK CONTROL/DELAY SYSTEMSTESTINGSPARK CONTROL SYSTEM1978 MODELS
1979 Toyota Pickup SR5
1978 Models
1979 Toyota Pickup SR5SECTION 1978 Models
- Disconnect vacuum hose to distributor advance mechanism and attach vacuum gauge to hose. With engine cold, start and run engine at 2000 RPM. Vacuum gauge should indicate manifold vacuum.
- On 2T-C engine, warm engine to normal operating temperature. Increase and maintain engine speed at 3000 RPM. Check that vacuum gauge reading changes from low to high within 3 seconds. Reconnect vacuum hose to distributor.
- On 20R and 2F engines, pinch hose to carburetor port. Warm engine to normal operating temperature. Increase and maintain engine speed at 3000 RPM. Check that vacuum gauge reading changes from low to high within 3 seconds. Reconnect vacuum hose to distributor.
- On all models, remove delay valve and blow through it. Air should flow in one direction only (toward colored side). Use cold/hot water to test thermal vacuum switch to determine it if allows passage of vacuum. When cold, vacuum should not pass. When hot, vacuum should pass.
- Remove distributor cap and rotor dust cover. Apply vacuum to advance mechanism and check that distributor advance mechanism moves when vacuum is applied.
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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.