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Ignition Change-Over (280 SE)

  1. The following checks must be made at an oil temperature above 17°C (63°F) and a coolant temperature below 100°C (212°F).
  2. Connect a timing light and tachometer, start engine. The ignition retard will be cancelled at approximately 2500 RPM, and the ignition timing will advance by about 20°.
  3. To check ignition changeover during an upshift from 3rd to 4th gear, the vehicle must be on a dynamometer. During a downshift from 4th to 3rd (under 2500 RPM), the distributor control must shift to ignition retard.
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