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Definition: A transformer in the ignition circuit that steps up the voltage provided to the spark plugs.

Related Resources:

The Ignition System
Here I discuss how the engine produces the spark and how it does it at the proper time.

Troubleshooting No-Start Problems
Key won't turn? It's raining and your car won't start? This will give you some possible reasons why.

Ignition Coils
How to inspect, test and replace the ignition coil in your car.

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