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To begin with, let's understand what we put into the concept of floating turnovers and how we understand that they actually float.
First of all, you need to look at the tachometer with the engine running, its arrow is in one place, around 800-900 revolutions, but this concerns a serviceable unit. If, when reading the tachometer, you see a periodic rhythmic movement of the arrow in the range of 400 — 1600 rpm, you can confidently talk about this problem.
Secondly, if you listen to the operation of the engine, at floating revolutions, you will feel that the car is "gassing up" on its own, and at these moments, a vibration appears in the cabin.
Most often, this very unpleasant problem is observed in injector cars with electronic gas and electronic throttle.
Algorithm of diagnostic and repair measures for the problem of floating turnovers:
The first thing to start with is gap measurements adjustment of valves engine This point is especially important for cars with screw adjustment of thermal gaps (Renault, Peugeot...) over time, the screws can spontaneously loosen, which leads to the formation of gaps of different sizes on different valves and, as a result, engine interruptions. It is also important to ask the service center to adjust the valves for you at least once every 1 km, because officially this procedure is not included in the list of procedures recommended for regular car maintenance.
The next point is moving to the idle speed regulator. This is a small electric motor with a cone on the end that automatically adjusts the throttle position under the control of the ECU when the gas pedal is not depressed. During the wear of its elements, the regulator fails and the ECU incorrectly interprets its position and incorrectly sends commands to the damper. To eliminate the problem, replace the RXX, this spare part is relatively inexpensive.
The next reason may be the not quite correct operation of the throttle valve. This part is involved in regulating the flow and pressure of incoming air
in cylinders Due to soot and debris, it can "stick" in some positions, which will lead to its incomplete jamming. As a result, the pressure regulation will be disturbed and the air will be "sucked" even when the valve is closed. The solution to the problem is to remove the valve and flush it with the help of the "VD 40" tool.
Another surprise can be issued by the previously mentioned electronic control unit, in ordinary ECUs or brains. In essence, this is a computer that controls all processes in the engine from the crankshaft position to the throttle opening angle. And there can be a banal glitch that leads to a constant failure, and even with a technically fully functional car, the ECU thinks that some node is not working correctly and tries to adjust it. The way out is very simple, reflashing the ECU or, for the common people, chip-tuning.
Remember one thing, when the motor jumps, jumps and swims incorrectly, it is necessary to immediately contact the service center to professional masters.
