What's the reason for the loss of idle speed?
1 Answers
The reasons for the loss of idle speed are as follows: Air intake pipe leakage: Fault analysis: According to the idle speed stability control principle of the engine, under normal circumstances, the opening degree of the idle speed control valve and the intake air volume strictly follow a certain functional relationship, that is, when the opening degree of the idle speed control valve increases, the intake air volume increases accordingly. If there is leakage in the intake pipe, the intake air volume and the opening degree of the idle speed control valve will not strictly follow the original functional relationship, meaning there will be abrupt changes in the intake air volume as the idle speed control valve changes. The air flow meter cannot accurately measure the actual intake air volume, causing the ECU to inaccurately control the intake air volume and resulting in unstable engine idle speed. Idle speed switch not closing: Fault analysis: If the idle speed contact is disconnected, the ECU will determine that the engine is under partial load. At this time, the ECU determines the fuel injection volume based on the signals from the air flow meter and the crankshaft speed. However, the engine is actually operating under idle speed conditions with less intake air volume, leading to an overly rich air-fuel mixture and an increase in speed.
