RPM fluctuation is one of the most common problems among all kinds of cars, regardless of age. This topic has been widely discussed a million times on various automotive forums. However, no one wants to search through long discussions to find an answer to this problem.

That's why we decided to prepare an article with the 12 most common reasons that cause fluctuations in engine speed. To begin with, it should be noted that the RPM fluctuation does not have to be due to just one malfunction.

Power and torque are the basic technical parameters of an internal combustion engine. Not only does the maximum speed and acceleration of the car depend on these parameters, but also fuel consumption or the ability to climb hills and the like.

Engine power can be expressed in kilowatts (kW), but the horsepower (HP or metric horsepower) is usually preferred. The unit of torque, colloquially torque, is either pound-foot (lb-ft) or Newton-metre (Nm).