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 Cressida
Disconnect vacuum hose from pipe "S" of vacuum control valve and connect to intake manifold. Disconnect vacuum hose from EGR valve and connect vacuum gauge to it. Start cold engine. With cold engine, vacuum should be zero at 2000 RPM. With hot engine, intake manifold vacuum should be present. Disconnect vacuum gauge and connect engine vacuum directly to EGR valve. Engine should die.
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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.