MERCEDES-BENZ 1972 Engine Modification With Fuel Injection: Description
The emission systems used on models with fuel injection are similar in function, however some of the components differ. The 280 SE and 600 models utilize a 17°C (100°F) oil temperature switch and a 100°C (212°F) coolant temperature switch, while all other models have only the 100°C (212°F) coolant switch. A gulp valve is used on 280 SE and 600 models only. This valve provides additional air to the intake manifold during periods of deceleration. A Throttle solenoid is used on 280 SE models only. The solenoid prevents engine from stalling when engaging transmission. All fuel injection models incorporate a two-way valve in the vacuum line to control ignition timing vacuum advance and retard. An RPM relay is used on 280 SE and 600 models.