Ask for help for the reason of idling engine clicking in 2.0t hot car.

If there is no obvious noise when the engine is idling, then the clear "click" knocking sound when the engine is idling is somewhat similar to the sound made by the steel ball falling on the steel plate, especially when the engine is accelerating rapidly at high speed. The sound of connecting rod bearing is lighter and shorter than that of crankshaft main bearing.

2. When the engine load increases, the sound will also increase, and the sound of single cylinder misfire will obviously weaken or disappear.

Cause of failure

1. Excessive wear of connecting rod bearing and journal leads to excessive out-of-round fit clearance.

2. The connecting rod bearing cap fastening bolt is loose.

3. The connecting rod bearing is poorly lubricated, and the alloy is ablated and falls off.

fault diagnosis

1. When the engine speed of the throttle valve increases, the sound becomes clear when it transits from idle speed to medium speed. Generally, when 1000-2000RMIN repeatedly jerks the throttle, the sound is particularly crisp, and the knocking sound is more obvious with the increase of vehicle speed.

2. Conduct a fire test on a cylinder. If the sound obviously weakens or disappears, the connecting rod bearing of the cylinder makes a sound.

3. No matter whether the engine speed is high or low or the temperature is high or low, there is a serious and rhythmic "clanging sound", and the sound of single cylinder fire accompanied by organic vibration remains unchanged or even more obvious, indicating that the connecting rod journal is out of round bearing alloy ablation or the connecting rod bolt is seriously loose. Stop immediately for disassembly inspection, find out the cause of the ablation of the connecting rod bearing, and replace the connecting rod bearing as appropriate.