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Single-Function For Standard Cooling (6-Cylinder & V6 Engine)

Connect vacuum gauge to center port "D" of CTO switch. When coolant is below 155°F (68°C), manifold vacuum should register. Above 155°F (68°C), carburetor ported vacuum should register. If valve does not meet these requirements, it must be replaced. See Figure .

Fig 1: Vacuum Spark Control Delay Valve (4-Cylinder & V6 Engines) When testing disconnect vacuum hose from port "4".