1.发动机冷车抖
1. Cold engine shaking
发动机在冷启动怠速时怠速抖动热车后正常。主要原因是发动机内部积碳太多，在冷启动喷油嘴喷出的汽油会被积炭大量吸收，导致冷车启动的混合气过稀，造成得启动困难，直到积炭吸收的汽油饱和才容易着车，而着车后吸附在积炭上的汽油又会重新吸入汽缸内燃烧使混合气变浓，发动机的可燃混合气时稀时浓，造成冷车启动后怠速抖动。另外一方面是由缺火造成多是火花塞、点火线圈等故障造成，缸内积碳或更换部件可解决。
The engine shakes at idle speed during cold start and is normal after heating up the vehicle. The main reason is that there is too much carbon buildup inside the engine, and the gasoline sprayed from the cold start fuel injection nozzle will be absorbed by a large amount of carbon buildup, causing the cold start mixture to be too lean, making it difficult to start. It is not until the gasoline absorbed by the carbon buildup is saturated that it is easy to land, and the gasoline adsorbed on the carbon buildup after landing will be sucked back into the cylinder for combustion, causing the mixture to become rich. The engine's combustible mixture will become lean and rich, causing idle shaking after cold start. On the other hand, misfire is often caused by faults in spark plugs, ignition coils, etc. Clearing carbon deposits in the cylinder or replacing components can solve the problem.
2.发动机热车抖
2. The engine is hot and the car shakes
济南哪里有宝马汽车维修人员发现汽车发动机会出现热车怠速时出现抖动现象。热车怠速抖的原因有很多，常见的是发动机缺火，一般检查火花塞、点火线圈、喷油嘴及油路、排气是否堵塞、燃油标号是否匹配、发动机积碳、节气门是否积碳、发动机胶块是否牢固等。
Where in Jinan did BMW car maintenance personnel find that the car engine may experience shaking when idling during hot driving. There are many reasons for idle vibration in hot cars, and the common one is engine misfire. Generally, check whether the spark plug, ignition coil, fuel injector and oil circuit, exhaust is blocked, fuel label matches, engine carbon deposits are removed, throttle valve carbon deposits are removed, and engine rubber blocks are firm.
3.发动机异响
3. Abnormal engine noise
发动机异响分为凉车异响和热车异响。凉车异响多是因为汽车长时间停放后机油流回油底壳，在冷启动时油泵不能在及时建立油压形成油膜，在冷启动时零件得不到润滑造成异响，因为不论是液压挺柱还是机械摇臂都会有一定的气门间隙或由于机油压力不够正时链条(带智能可变配气或气门升程系统)未能正常工作才导致哒哒的响声。此外发动机还有一个元件也会出现哒哒的响声——碳罐电磁阀(清污阀)。而热车异响的问题一般比较严重也不好检查，一般发动机出现校杆、敲缸时车主要心里准备(可能拉缸)，不过几率很小(多跟进气提前角有关系)。曲轴箱通风泄漏也会引发异响且声音比较大，汽车皮带在一定转速时也会出现异响，多为皮带打滑或者老化。当发动机的异响中有金属敲击声明显时，建议直接去修理厂检修。
Engine noise can be divided into cold car noise and hot car noise. The reason for the abnormal noise of a cold car is that the oil flows back to the oil pan after the car has been parked for a long time. During cold start, the oil pump cannot establish oil pressure in a timely manner to form an oil film, and the parts cannot be lubricated during cold start, resulting in abnormal noise. This is because both hydraulic tappets and mechanical rocker arms have a certain valve clearance or the timing chain (with intelligent variable valve distribution or valve lift system) cannot work properly due to insufficient oil pressure, resulting in the clicking sound. In addition, the engine also has a component that can make a clicking sound - the carbon canister solenoid valve (purge valve). The problem of abnormal noise in hot cars is generally more serious and difficult to check. Generally, when the engine experiences rod calibration or cylinder knocking, the car is mainly prepared (possibly pulling the cylinder), but the probability is very small (mostly related to the intake advance angle). The leakage of crankcase ventilation can also cause abnormal noise and the sound is relatively loud. The car belt can also make abnormal noise at a certain speed, mostly due to belt slipping or aging. When there is a noticeable metal tapping sound in the abnormal noise of the engine, it is recommended to go directly to the repair shop for maintenance.
4.发动机积碳
4. Engine carbon buildup
积碳的形成主要是发动机在做功时不完全燃烧，在加上燃油和机油中的杂质在燃烧时产生的胶状物质，久而久之便形成了积碳。积碳会造成凉车发动机抖动、怠速发动机抖动、动力性下降、油耗升高、出现启动困难、怠速不稳、加速不良、尾气超标、油耗增多等现象，解决办法可通过积碳缓解。
The formation of carbon deposits is mainly due to incomplete combustion of the engine during work, and the addition of impurities in fuel and engine oil during combustion produces colloidal substances, which over time form carbon deposits. Carbon accumulation can cause cold engine shaking, idle engine shaking, decreased power, increased fuel consumption, difficulty starting, unstable idle speed, poor acceleration, excessive exhaust emissions, increased fuel consumption, and other phenomena. The solution can be achieved by removing carbon accumulation.
That's all for the specific content of the four common faults when repairing the engine of BMW cars. We hope to provide you with good help. For more information, please come to our website http://www.lutongqixiu.com consulting service
