Many car owners reported that when their vehicle engine is at idle speed, they hear a "click" sound at the rear of the engine, which is more obvious when accelerating. Many car owners worry that this is the rhythm of overhauling the engine. It's too hard to talk about overhauling as soon as the engine makes a "dada" sound. We still have to look at the causes of the "dada" abnormal sound, and then apply the right medicine to the case.
1. Cold start abnormal sound
Many car owners will hear the "dada" noise from the engine compartment when the car is cold started. In fact, this "dada" noise is caused by the oil pump not fully establishing the oil pressure during cold start, resulting in the lack of lubrication of various components. Under normal circumstances, when the engine runs for a period of time, the rattling noise will disappear.
2. Abnormal operation noise of carbon canister solenoid valve
The function of carbon canister solenoid valve is that when the engine is started, the solenoid valve installed between the carbon canister and the intake manifold is opened, and the gasoline vapor adsorbed in the carbon canister together with air is brought into the cylinder for combustion. This not only reduces emissions, but also reduces fuel consumption. This part will also make a clatter sound during operation.
The above two are normal engine clattering. Therefore, the clattering sound of car cold start is not always a fault, let alone the hidden danger of overhauling the engine.
3. Machine foot glue aging or loosening
The machine foot rubber is the rubber block between the engine and the frame. Its function is to reduce the vibration and buffer when the engine is working, and play the effect of fixing the engine. Once these machine foot glues are aged or loose, the engine will shake, and in serious cases, there will be "clatter" abnormal sound. This kind of machine foot glue only needs to be replaced with a new one.
4. The mixture is too rich
When the engine mixture is too rich, the phenomena are: it is difficult to accelerate after starting, and the engine runs unevenly; The exhaust pipe emits black smoke, the engine is accompanied by a creaking noise, and sometimes blasting; Engine power decreases and fuel consumption increases. This is mostly related to carbon deposition and filter blockage, and generally does not need overhaul.
Generally speaking, it is unlikely that the engine will cause an overhaul after the "dada" abnormal noise. Look at the above, as long as you know the crux of the abnormal noise, you can effectively solve the problem. When we find that the vehicle has "signs" of abnormal noise, we should go to the 4S store for maintenance in time. If it is delayed for a long time and the root cause of the problem is uncertain, it will not be far from the engine overhaul you are worried about