What Causes the Clicking Noise During Hot Idle That Disappears When Accelerating?
1 Answers
Generally, when the car has just been started, the engine oil temperature has not yet reached its normal operating value. This results in a viscosity that is unsuitable for the proper functioning of hydraulic lifters, reducing their sealing capability and causing excessive valve clearance, which generates the noise. Once the engine reaches its normal operating temperature, the valve noise will diminish until it disappears. Here are some precautions to take when starting the car: 1. Visual Inspection: Walk around the car to inspect its exterior and surroundings. Check for any obstacles in front or behind the vehicle, look for suspicious oil or water stains on the ground where the car is parked, ensure the front and rear light assemblies are undamaged, and verify that the tire pressure is adequate. 2. Check: Ensure the engine oil and coolant levels are sufficient, and confirm that the front and rear lights, signal lights, and dashboard indicators are functioning properly. This step focuses on inspecting the internal technical condition of the car. 3. Starting: If the first two steps are normal, turn the ignition key to start the engine. Each startup should not exceed ten seconds. It is important to note that during a cold start, the throttle should be pressed gently and gradually. Avoid immediately revving the engine to high RPMs upon startup, as a sudden increase in crankshaft speed during a cold start may prevent the oil from reaching the bearing journals in time, potentially causing bearing damage.
