Ignition Coil 8567157-04 856715704 for BMW

Car ignition coils can be replaced by themselves. ‌ While the process of replacing an ignition coil requires some hands-on skills and tools, it does not require a deep knowledge of automotive theory. Here are the steps to replace the ignition coil: ‌12

‌ Preparations ‌ : Make sure the vehicle is turned off and cooled and disconnect the battery to prevent electric shock or damage to electronics. Get the tools you need to replace the ignition coil, such as a screwdriver and a new ignition coil.
‌ Open engine cover ‌ : Use a tool to pry open the engine cover and locate the ignition coil.
‌ Removing the old ignition coil ‌ : Remove the screws around the ignition coil using a screwdriver, clean up the dust and debris around the ignition coil, and then remove the old ignition coil.
‌ Install new ignition coil ‌ : Install the new ignition coil in its original position, ensuring that it is securely connected to the spark plug terminal.
‌ fixing and connecting ‌ : Use a suitable sleeve tool to tighten the fixing screw of the ignition coil and connect the ignition coil plug corresponding to each cylinder.
‌ test ‌ : Start the vehicle and check that the ignition coil is working properly to ensure that the engine starts normally and there are no air leaks or other problems.
‌ done ‌ : If all is well, put the hood back on and finish replacing the ignition coil.
While it is possible to replace the ignition coil yourself, it is recommended to be safe during the operation and ensure that all steps are performed correctly to avoid damaging the vehicle or causing personal injury.

The main manifestation of insufficient ignition coil energy ‌
‌ engine starting difficulty ‌ : Insufficient ignition coil energy will cause the engine to be difficult to start, and it may take several attempts to succeed.
‌ weakened power ‌ : the vehicle's acceleration and climbing ability is reduced, and it feels that the power is insufficient during driving.
‌ increased fuel consumption ‌ : Increased fuel consumption due to inadequate combustion.
‌ jitter and idling instability ‌ : the engine jitter obviously at idle, and may also jitter during driving.
‌ stalling ‌ : In extreme cases, insufficient ignition coil energy may cause the engine to suddenly stall.
The specific cause of insufficient ignition coil energy
‌ winding short circuit ‌ : lead to voltage reduction, spark plug electrode too fast black (carbon deposit).
‌ Open circuit or ground fault ‌ : prevents the generation of high voltage, resulting in failure to ignite.
‌ surface discharge ‌ : discharge caused by dirt or moisture on the surface of the coil.
‌ insulation aging ‌ : Insulation aging caused by frequent ignition under high temperature or heavy load conditions, affecting the voltage output.