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Home >> Jeep >> 1984 >> Scrambler Base, 4.2 C, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Spark Control System >> Testing >> Spark Coolant Temperature Override Switch >> Single-Function for Standard Cooling (4-Cylinder)

Single-Function for Standard Cooling (4-Cylinder)

Disconnect vacuum hose from distributor vacuum advance mechanism and connect vacuum gauge to hose. Start engine. With coolant temperature below 120°F (49°C), manifold vacuum should register. Disconnect vacuum hose from port "4" of delay valve and cap. Manifold vacuum should not register until coolant temperature reaches about 120°F (49°C). If valve fails these tests it must be replaced. See Fig 1 .

Fig 1: Vacuum Spark Control Delay Valve (4-Cyl. & V6) When testing disconnect vacuum hose from port "4".
G8958
NOTE: Ported vacuum is not available with throttle closed. Ported vacuum is available at part throttle (equivalent of 1000 RPM).
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