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Home >> Mazda >> 1985 >> RX-7 S >> Repair and Diagnosis >> Engine Performance >> System >> Ignition Control System - CARBURETED >> Component Testing >> Vacuum Control Solenoid Valve Signal Check >> Trailing Vacuum Control Solenoid Valve Signal
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Trailing Vacuum Control Solenoid Valve Signal

  1. Warm up engine to normal operating temperature. Connect a tachometer to engine. Disconnect the vacuum sensing tube (from trailing vacuum advance diaphragm to pipe) at the pipe. Place a finger over the pipe opening and make sure that air is not sucked into the pipe.
  2. Gradually increase the engine speed and make sure that air is sucked into the pipe when the engine speed is 2900-3100 RPM or more. Decrease the engine speed from 4000 RPM rapidly and make sure air is not sucked into pipe while decelerating.
  3. On vehicles with automatic transmissions, run the engine at idling speed and make sure that air is sucked into the pipe when the shift lever is in the "R", "D", "D1" or "D2" position. On all models, disconnect the connector from the number 1 water temperature switch and connect a jumper wire to both terminals in the connector.
  4. Pull out the choke knob about .6" (15 mm) and make sure that air is not sucked into the pipe at any engine speed. Stop the engine and disconnect the connector for the number 2 water temperature switch on the radiator. Pull the choke knob out about .6" (15 mm) and start the engine. Increase the engine speed and make sure that air is sucked into the pipe when the engine speed is 1000-2000 RPM or more.
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