Idle speed of Gazelle 405 engine floats
The ZMZ-405 engine idle speed regulator or IAC sensor is one of the main actuators of the engine control system.
Stability of idle speed, fuel consumption, and situations with sudden engine shutdown depend on its correct operation. The regulator (РХХ-60 or 0280 140 545) is installed on the receiver of the air intake system. It is an electrically driven valve that regulates the air supply to the intake system, bypassing the throttle valve, which ensures that the specified idle speed is maintained in various engine operating modes (starting, warming up, engine braking, additional load from attachments). In essence, it is an idle speed regulator.
If the regulator fails or there is a malfunction in its circuit, the control unit will turn on the KMSUD indicator lamp and write the corresponding fault code into the memory. With a faulty regulator, the engine may stall at idle after starting and run at high speeds. If, due to mechanical damage or contamination, the butterfly valve becomes stuck, the engine will be unstable at idle.
Operating principle
In addition to the fact that the electronic control unit (ECU) receives signals about the current temperature of the coolant and oil in the engine, it determines the correct air-to-fuel ratio for starting. Before driving a car in the winter, you need to slightly warm up the engine to minimum operating temperature. This manipulation reduces the likelihood of damage to system parts and makes the engine start and operation more stable when turned on. The regulator channel opens before starting to mix fuel with air.
Float speed gazelle 405 euro 2
Commercial vehicles often come to our service center, namely GAZelle cars, and today is no exception. An onboard workhorse with a ZMZ 405.22 Euro-2 engine pulled into the diagnostic post. The owner of the car (or rather the third owner) after purchasing it noticed that the car was driving somehow wrong. The revolutions dance as they please: they rise and fall. The check light blinks like crazy, the car jerks and shakes. In general, the car lives its own life, and something needs to be done about it
