The term car idling, I believe everyone is not unfamiliar, it refers to the engine in the case of no load, only need to overcome the frictional resistance of their own internal parts, do not output power when the speed. In other words, the minimum speed to maintain the stable operation of the engine is idle speed. So, what is the reason for the high idle speed of the car engine? And how should it be solved? Let's take a look!
Causes and solutions to high engine idle speed:
First, the volume of carbon in the throttle is too much, and these carbon deposits are formed by the long-term intake of the intake system, because the air will contain impurities such as dust. When there is more carbon deposit, the throttle opening and closing resistance will become larger and the engine intake will be reduced, and the air intake will be easy to cause the flameout to be less, at this time, the ECU will increase the intake volume in order not to turn off, and adjust the increase in the opening of the throttle, and the engine idle speed will naturally increase. The solution is to use a carburetor cleaner to clean the carbon deposit on the throttle, and then match the throttle opening. It should be noted that when cleaning, it is necessary to avoid spraying detergent into the pins to avoid damage to the internal electronic components of the throttle body.
Second, there is air leakage at the rear end of the throttle, which is generally caused by the aging and rupture of the intake manifold gasket, the damage of the vacuum tube, etc., because the rear end of the throttle valve is in a negative pressure vacuum area, and the leakage will cause the outside air to be sucked into the engine, and the ECU detects that the engine air increases, which is bound to increase the amount of fuel injection, so that the idle speed increases. When solving, you can use a smoke leak detector to check the leak, and then treat the damaged gasket and vacuum tube.
The third is the damage to the generator, because when the engine speed is unchanged, the generator load increases with the increase of electrical equipment. If the ECU detects that the generator is not generating electricity at this time, it will think that the engine speed is low, so it will issue an instruction to increase the engine idle speed. When solving, you can use a multimeter to measure whether the generator's power generation is within the normal range, and if it is not, you need to replace the damaged generator. In addition, damage to the current monitoring sensor on the battery pile head can also lead to an increase in idle speed.
Fourth, the throttle itself and the idle motor is damaged, the damage to the potentiometer inside the throttle body will affect the opening size of the throttle, and the large opening will lead to high idle speed; and the idle motor is the motor that regulates the idle speed of the vehicle, if it is damaged, it will also lead to high idle speed. The solution is to replace the throttle body or idle motor.
Finally, high idle speed (short duration) at the start of the cold car is a normal phenomenon, which is aimed at allowing the engine to reach the best operating temperature in the shortest possible time, thereby improving the efficiency of the fuel and better protecting the engine. If the idle speed is still high after the hot car, it is necessary to check the carbon deposit of the throttle and other reasons.
The above are the four reasons for the high engine idle speed, namely throttle volume carbon, air leakage, generator damage and idle motor damage, I hope to help the owners and friends, reduce the trouble of the usual car!