Ignition coils, remember the four big words "Look, smell, ask and cut"
See if there are any obvious cracks on the surface, and measure the voltage-resistance!
There are a few one-piece ignition coils in division-type American cars, and more than 90% of them are two or four. Multi-cylinder cars have six or eight ignition coils. You can use a simple method of swapping! Read the fault such as the second cylinder misfire, you can swap the ignition coils of the second cylinder and the third cylinder, and the fault changes to the third cylinder misfire. At this time, it is easy to judge that the ignition coil is damaged! When replacing the ignition coil, you must choose the big brand "Torch" ignition coil. A good ignition coil can perform better and is not easy to be damaged, but it can better protect the spark plug below! It is very important to recognize the brand "Torch"
Once the ignition coil is damaged, the spark plug will not be able to ignite the combustible mixture, which will easily lead to insufficient engine cylinders, resulting in violent shaking. If the cylinder lacks too much or two adjacent working cylinders lack cylinders at the same time, the engine may not start normally.
Increased fuel consumption and reduced power:
Even if the ignition coil damage does not lead to a shortage of engine cylinders, the combustion of the engine's combustible mixture will still be affected due to the weakened spark plug flashover ability, resulting in adverse reactions such as increased fuel consumption and reduced power.
A large amount of carbon deposits:
When the flashover ability of the spark plug is weakened, it will also lead to incomplete combustion of the combustible mixture. The incomplete combustion of the combustible mixture will produce a focal substance called carbon deposits, and the car exhaust will emit black smoke.
If the ignition coil is severely damaged, resulting in too many engine cylinders or two adjacent working cylinders lacking cylinders at the same time, the engine may not start normally, and the car will not be able to run normally.
If the ignition coils only impair the spark plug's ability to flash, the vehicle is drivable. Of course, if you insist on driving, there will be adverse phenomena such as increased fuel consumption and reduced power.