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.
1979 Mazda B2000 BaseFACTORY OEM SERVICE PROCEDURE
1979 Models (3-Way Solenoid Test)
- Remove vacuum sensing tube from servo diaphragm. Remove intake manifold vacuum tube from 3-way solenoid. Detach wire from 3-way solenoid which comes from engine speed switch. Ground 3-way solenoid at disconnected terminal using jumper wire.
- Turn ignition on (engine off). Blow air through vacuum hose disconnected from servo diaphragm and note that air should come out of 3-way solenoid filter (cap can be removed for easier checking). See Figure.
- Turn ignition off. Blow air into same vacuum tube and note that air should now come from nipple which normally connects to intake manifold. If valve does not function in this manner, replace 3-way solenoid.
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.
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