Coil: Electrical device that creates the sparks that can be seen in spark plugs.
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It is a high-current generator. The engine's computer sends a signal to the coil so that it can boost the energy that will be conducted through some special wires to the spark plugs and, in one of its ends, the spark that will later spark the fuel mixture inside of the cylinders will be generated.
Hello I was having trouble coming to a stop and my engine wants to stall so I finally came to replace the throttle body and did a tune up while under the hood with spark plug and ignition coil replacement and oil change. When I finished I come to turn the key and no start. I continue to replace the fuel pump, Mass, map sensors and crank position sensor. With my finally replace was the fuel injectors. After following the repair Manuel. Its turns on for a second and doesn’t stay on. I did a compression test and it passed with 170 psi every cylinder when I was driving lasted there was some loud noise coming from the engine but they went away. I check all the fuses and nothing blown