The car engine is the most important unit in the design of every car. Due to the complexity of the design, sooner or later any motor begins to behave incorrectly. Many drivers are faced, among other things, with such a problem as "floating" rpm, so they will be interested in the answer to the question of what could have caused this behavior of the power unit.
1. "Singe" fuel
The first and perhaps the most common reason for the tachometer needle twitching in an unpredictable manner lies precisely in poor fuel. The speed begins to float due to the fact that the fuel injectors are clogged, and plaque is rapidly forming on the spark plugs. Problems of this kind can be solved only at the service station, but not on the road. All you can do along the way is refuel at a proven network of gas stations.
2. Fuel supply
Problems with fuel supply in a car, as a rule, arise due to the same low-quality fuel. Most often, the fuel filter is simply clogged. The fuel pump also suffers. In any case, you will have to contact the service station for help. In addition, if an integrated fuel pump is installed in the car, then the repair of such a system can cost a serious amount.
3. Ignition system
Ignition system problems can also lead to floating engine speeds. More often than not, high voltage wires or candles are the main culprit. Much less often - distributor cover. Both are treated in only one and extremely unpleasant way - a complete replacement.
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4. EGR
The trouble can come from the side of the EGR valve, because over time it gets clogged with soot and dirt. The most unpleasant thing about this breakdown is that the car can not only lose momentum, but completely stall. Most often this happens when you try to brake sharply. The problem is solved by banal cleaning. In advanced cases, the valve will have to be changed completely.
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5. Other problems
There is still a whole galaxy of different problems that can cause floating speed. All of them are much less common and are often not diagnosed on their own. Among the most famous are: improper operation of the engine control unit, failure of the throttle position sensor, malfunction of the idle speed controller. For any of the listed (and not listed) problems, you need to contact the station for help.
Continuing the topic, read about why do american trucks have long hoods, but domestic - no.
A source: https://novate.ru/blogs/220720/55408/