1.發動機冷車抖
1. Cold engine shaking
發動機在冷啟動怠速時怠速抖動熱車后正常。主要原因是發動機內部積碳太多，在冷啟動噴油嘴噴出的汽油會被積炭大量吸收，導致冷車啟動的混合氣過稀，造成得啟動困難，直到積炭吸收的汽油飽和才容易著車，而著車后吸附在積炭上的汽油又會重新吸入汽缸內燃燒使混合氣變濃，發動機的可燃混合氣時稀時濃，造成冷車啟動后怠速抖動。另外一方面是由缺火造成多是火花塞、點火線圈等故障造成，清除缸內積碳或更換部件可解決。
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.發動機熱車抖
2. The engine is hot and the car shakes
濟南哪里有寶馬汽車維修人員發現汽車發動機會出現熱車怠速時出現抖動現象。熱車怠速抖的原因有很多，常見的是發動機缺火，一般檢查火花塞、點火線圈、噴油嘴及油路、排氣是否堵塞、燃油標號是否匹配、清除發動機積碳、節氣門是否積碳、發動機膠塊是否牢固等。
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.發動機異響
3. Abnormal engine noise
發動機異響分為涼車異響和熱車異響。涼車異響多是因為汽車長時間停放后機油流回油底殼，在冷啟動時油泵不能在及時建立油壓形成油膜，在冷啟動時零件得不到潤滑造成異響，因為不論是液壓挺柱還是機械搖臂都會有一定的氣門間隙或由于機油壓力不夠正時鏈條(帶智能可變配氣或氣門升程系統)未能正常工作才導致噠噠的響聲。此外發動機還有一個元件也會出現噠噠的響聲——碳罐電磁閥(清污閥)。而熱車異響的問題一般比較嚴重也不好檢查，一般發動機出現校桿、敲缸時車主要心里準備(可能拉缸)，不過幾率很小(多跟進氣提前角有關系)。曲軸箱通風泄漏也會引發異響且聲音比較大，汽車皮帶在一定轉速時也會出現異響，多為皮帶打滑或者老化。當發動機的異響中有金屬敲擊聲明顯時，建議直接去修理廠檢修。
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.發動機積碳
4. Engine carbon buildup
積碳的形成主要是發動機在做功時不完全燃燒，在加上燃油和機油中的雜質在燃燒時產生的膠狀物質，久而久之便形成了積碳。積碳會造成涼車發動機抖動、怠速發動機抖動、動力性下降、油耗升高、出現啟動困難、怠速不穩、加速不良、尾氣超標、油耗增多等現象，解決辦法可通過清除積碳緩解。
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.zhongzaojixie.com consulting service
