190E 2.3 (201.024) L4-2.3L (102.961) (1984)
"Engine cold" must be simulated for testing acceleration enrichment.
7 Valve screw closed.
8 Simulate "engine cold" by feeding in 2.5 kohm with ohm decade, corresponds to approx. + 20°C, between engine coolant temperature sensor
connection cable and vehicle ground.
9 Start engine. Specified value at +20°C approx. 0.5 bar below the previously measured system pressure. Increase engine speed sharply to
approx. 2500/min. Lower chamber pressure must drop as engine speed increases.
If the specified value is not reached:
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Test volume air flow sensor potentiometer. Refer to "Testing Electrical Components of CFI System". See: Powertrain Management/Fuel
Delivery and Air Induction/Testing and Inspection
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Test current at actuator. Refer to "Testing Electrical Components of CFI System". See: Powertrain Management/Fuel Delivery and Air
Induction/Testing and Inspection
Checking fuel system for leaks
1 Switch off engine. The pressure in the system drops below the opening pressure of the injectors (approx. 3.0 or as from 09/88 approx. 3.2 bar
gauge pressure).
2 If the pressure drops immediately to 0 bar, replace check valve at the fuel pump.
3 If the pressure drops slowly, unscrew fuel return line (51) at the diaphragm pressure regulator. No fuel must flow out subsequently from the