Contents: Starting a cold engine ↳ Idling ↳ Normal mode and acceleration ↳ Full load ↳ Setting the idle speed ↳
Starting a cold engine
When the ignition is turned on, the coolant temperature sensor sends a "engine cold" signal to the EEC-IV device.
The device enriches the fuel mixture for cold starting by changing the injector opening time, and the number of revolutions is dependent on the temperature by activating the throttle motor. These signals are naturally supplemented by other signals.
When the engine warms up, individual sensors, in accordance with the change in engine temperature, as well as when the load mode and speed change, send voltage and frequency signals to the EEC-IV device, as a result of which the device determines the engine's need for fuel by adjusting the injector opening time.
Idling
The throttle motor controls the rotation speed depending on temperature under all load conditions.
Normal mode and acceleration
These modes do not require the use of special devices. Depending on the throttle valve opening parameters, air temperature, vacuum in the intake manifold, engine temperature, exhaust gas quality and speed, the EEC-IV device regulates the opening duration and thus the fuel dose for the injector, as well as the ignition timing.
Full load
At fully open throttle, the device receives a signal for enrichment at full load. The fuel dose is determined in the same way as in other operating modes by processing the readings of all sensors.
Setting the idle speed
The idle speed is 900±50 rpm.
1. Warm up the engine.
2. Stop the engine and connect the tachometer.
3. Remove the intake silencer.
4. Start the engine, while turning off all electrical consumers.
5. Set the idle speed using the screw (1) of the throttle lever. To do this, unscrew the lock nut (2) (3 - control motor slider, 4 - throttle position sensor).
6. Check individual air hoses and accelerator cable installation.
Attention! When the battery is disconnected, all parameters stored in the KAM (Keer Alife Memory) memory unit of the EEC-IV device disappear. These include parameters for the modes: idle, partial and full load. Therefore, after connecting the battery, the normal operation of the engine in various modes is disrupted. For this reason, after connecting the battery, it is necessary to bring the engine to operating temperature. After working in idle mode for 3 minutes, increase the speed to 1200 rpm and maintain it for 2 minutes. When performing this procedure, the EEC-IV device restores the idle parameters.
7. To restore all parameters of the EEC-IV device, it is necessary to make a test drive. Usually, for this purpose, it is necessary to drive 8 km in various driving modes.