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Home >> Mazda >> 1978 >> Cosmo Standard Trans >> Repair and Diagnosis (Single Page) >> Engine Performance >> Engine Control Systems >> Ignition Timing Control - Rotary >> Testing >> Trailing Ignition Timing >> 1978 Models & 1979 RX7
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1978 Models & 1979 RX7

  1. Disconnect vacuum sensing tube from dashpot diaphragm. Connect tachometer and timing light to trailing spark plug wire (topmost spark plug).
  2. Warm engine to normal operating temperature. Gradually increase engine speed and check that timing light flashes when engine speed is more than 2700-3300 RPM.
  3. Return engine to idle. Increase engine speed to 2000 RPM and slowly decrease engine speed. Record speed at which timing light starts flashing. Speed should be 1000-1300 RPM.
  4. Slowly increase engine speed and record speed at which timing light stops flashing. This speed should not vary from speed recorded in step 3)  by more than 100-200 RPM.
  5. On manual transmission equipped vehicles, set engine speed to 2000 RPM. Depress clutch pedal and check to see that timing light flashes when shifting into 4th or 5th gear. Return transmission to Neutral.
  6. On manual transmission equipped vehicles, again raise engine speed to 3000 RPM and quickly release throttle. Timing light should start flashing and continue to flash during deceleration and at idle speed.
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