Pressure test
Measuring the control pressure in various engine operating modes allows you to check the operation of the fuel dispenser and control pressure regulator.
Disconnect the fuel supply pipe to the starting injector from the dispenser-distributor and connect a pressure gauge hose instead of it to check the fuel pressure.
Remove the fuel pump enable relay and connect a jumper to the pump power terminals, thereby turning on the fuel pump.
Measure the fuel supply pressure on the pressure gauge, which should be in the range of 6.1-6.5 kg / cm2.
Disconnect the pressure gauge hose and connect the fuel supply pipe to the starting injector to the dispenser-distributor.
Disconnect the fuel supply pipe to the lower chambers from the dispenser-distributor and connect the pressure gauge hose instead.
On a cold engine, disconnect the coolant temperature sensor connector and connect a milliammeter between the sensor and its connector. Turn on the fuel pump as above. Turn on the ignition.
Measure the pressure on the gauge and the power supply current of the coolant temperature sensor, showing. how the control pressure changes with engine temperature.
Disconnect the control pressure regulator connector and measure the control pressure on the pressure gauge, which should be between 0.3-0.5 kg / cm2.
Connect the connector of the control pressure regulator and measure the control pressure on the pressure gauge, which should be in the range of 1.2-1.5 kg / cm2.
Replace the fuel pump relay.
Start the engine and bring the engine speed to 2500 rpm.
Release the throttle pedal and measure the control pressure on the gauge. Stop the engine.
Disconnect the coolant temperature sensor connector and connect a wire with a 2.5 kΩ resistor between the sensor connector and «weight», thus simulating a coolant temperature of 20°C.
Start the engine and by pressing the throttle control pedal several times, bring the engine mode to 2500 rpm. At the same time, control the pressure on the pressure gauge, which should decrease.
Stop the engine and measure the fuel pressure in the system when the ignition is turned off. If the pressure immediately drops to 0 kg/cm2, replace the fuel pump check valve.
Loosen the union of the pipeline draining the fuel into the tank. At the same time, not a single drop of fuel should flow out from under it.
Pinch the fuel outlet hose to the accumulator. If the pressure in the system does not change, replace the fuel accumulator.
Carefully disconnect the pressure gauge hose from the dispenser. to avoid injury from pressurized fuel.
Checking the idle speed controller
Start the engine, attach a control tachometer and take its readings.
Warm up the engine to operating temperature.
Disconnect the idle speed controller connector.
Measure the resistance between the center plug and each of the extreme plugs of the regulator block, which should be within 10-30 ohms.
Measure the voltage between the center plug and each of the extreme plugs of the regulator block, which should be between 1-2 V.
Carbon monoxide regulation (SO) in exhaust gases
Connect the gas analyzer and control tachometer according to the instructions for use.
Warm up the engine and leave it idling at a crankshaft speed of 650-790 rpm.
Measure the CO content in the exhaust gases, which should be in the range of 0.1-1.1%. In case of deviation from the norm, remove the plug of the adjusting screw located between the fuel dispenser and the connecting air duct with the air flow meter. By turning the screw with a special socket wrench with a diameter of 1 mm, achieve the required CO content. When the adjusting screw is turned clockwise, the combustible mixture is enriched and vice versa.
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