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1974 280Z Models

  1. Inspect cap, rotor, and distributor pick-up coil air gap. Clean adjust, or replace components as necessary. Adjust air gap to 0.008 - 0.016" (0.3 - 0.4 mm).
  2. To check phase difference on dual pick-up distributors, disconnect Green wire from coolant temperature switch and ground wire. Adjust ignition timing to 15 degrees BTDC at 600 RPM.
  3. Install a jumper wire across terminals of coolant temperature switch harness connector. Ignition timing should be 8 degrees BTDC at 600 RPM, which equals a phase difference of 7 degrees. If necessary, turn adjuster plate until correct specifications are obtained. After adjustment, reconnect Red wire to coolant temperature switch.
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