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Home >> Mercedes Benz >> 1972 >> 350SL Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Ignition System >> MERCEDES-BENZ 1972 Engine Modification With Fuel Injection >> Operation >> Ignition Retard
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Ignition Retard

  1. At oil temperatures over 17°C (280 SE) and coolant temperatures under 100°C (All) the temperature switch or switches are open. On 280 SE models, should the speed drop below 2200 RPM when the switches are open, the RPM relay activates the two-way valve and ignition timing is retarded.
  2. On all other models, the ignition will be retarded only when throttle valve is closed and coolant temperature is below 100°C (212°F).
  3. The ignition retard will be cancelled when any of the following conditions exist: Oil temperature below 17°C (280 SE), engine speed over 2500 RPM (280 SE), coolant temperature over 100°C (All), air conditioning switched on (All except 280 SE) fourth gear of transmission engaged (280 SE).
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