Then there is a no spark condition and engine will not run. If it has more than one coil pack it will miss on the cylinders controlled by the defective coil pack.
No spark no bang. It won't run.
When i stops firing. The check engine light will come on when it goes bad.
Most automobiles will not start with a nonfunctioning coil pack. The coil pack will cause the spark plugs not to fire.
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Symptoms of a bad coil pack can vary. Most common is a Misfire which will turn on the check engine light. the most common way to test a coil pack is with a volt meter set to OHMS
symptoms are: you can hear the engine missing, spitting and sputtering, loss of power...you can tell if it is a coil pack by unscrewing the spark plug that it connects to coil pack. when you look at your spark plug it should be a light grayish, white..this means the coil pack is working....it is best if you do this with new spark plugs, because your spark plugs could be bad. but you do this process until you find a bad plug then, that coil pack probably is the bad coil pack.
A bad coil pack would not smell like gasoline.
When an ignition coil goes bad the car will not run right, or not at all. An intermittent coil will cause shudder, or a jerking motion. When the coil has no output then the cylinder that the coil feeds cant burn the fuel and cause power.
One of the symptoms of a bad boil pack is a rough idle. Other symptoms include a loud engine, loss of power, and a check engine light that goes on and off.
bad coil pack... replace coil pack
Bad coil or coil pack.
Go to AutoZone have them rear your codes for FREE. This way you will know which Coil Pack is goig bad / or is bad. If you have a 4.6L you will have only 2 Big Coil Packs. If you have the 5.4L you will have 8 Coil Packs , One coil pack for each cylinder.