Unstable engine operation and so-called floating rpm is a common problem that is common in many cars. In such a case, the car needs comprehensive diagnostics, which allows you to quickly establish the cause of the malfunctions. Let’s talk in more detail about the most common engine malfunctions that lead to such unstable engine speeds and cash for scrap cars.
In the presence of such malfunctions, a deterioration in engine performance is noted, engine power decreases or completely disappears, the driver notices a significant increase in fuel consumption. If the car owner does not pay attention to the existing malfunctions in a timely manner, ultimately this leads to serious engine breakdowns, the elimination of which will require an overhaul of the engine. That is why, as soon as you notice the first motor malfunctions and the appearance of floating speed, you should either carry out diagnostics and repairs yourself, or contact experienced specialists.
Problems with the composition of the working mixture
Due to air leaks through damaged pipes and system seals in the engine, the composition of the air-fuel mixture can change. In such a case, the engine invariably suffers, the fuel-air mixture is depleted, which burns poorly in the car engine.
In the presence of such problems, it is necessary to localize damage to the pipes or find worn seals, which is done both in service conditions and independently using various flammable liquids. All that the car owner will need to do is to spray such liquids on suspicious areas with the engine running, if there are any changes in the operation of the motor, this indicates a leakage of the entire system.
Ignition system malfunctions
Unstable engine speeds are often caused by faults in the ignition system. For various reasons, the spark may briefly weaken or its gaps are noted altogether, as a result, the fuel does not completely burn out in the cylinders, this not only leads to floating revolutions, but can also worsen the condition of the catalyst, and in such a case, the car owner will face serious expenses for replacing such an exhaust neutralizer gases.
First of all, in case of problems in the ignition system, it is necessary to check the high-voltage ignition coils, the malfunctions of which can be expressed in the appearance of a small, barely noticeable tremor. If possible, the coils are swapped or rearranged. Another common problem is the lack of contact on high voltage wires. They are checked with a multimeter, and if damaged, they are changed, which allows ensuring a high-quality spark plug and correct combustion of fuel in the engine cylinders.
There are numerous wires in the ignition system, in which contact can be lost for various reasons. Most often, this is oxidation of the harness connectors of the engine control unit, which leads to malfunctions in the operation of the motor.
Unfortunately, it will be difficult to carry out high-quality diagnostics in such a case, it is necessary to contact highly qualified masters, only they, with the help of special equipment, will be able to install problem wiring and replace it.
Let’s sum up
There can be many reasons for floating unstable engine speed, but most often it is a malfunction in the ignition system, a change in the composition of the working fuel-air mixture, as well as the oxidation of numerous wires that are responsible for powering the engine and supplying the control unit. Regardless of the cause of such a breakdown, you should immediately contact the service, carry out diagnostics of the car and its qualified repair.