Before I get into testing and inspecting ignition coils, it is important to understand the basic operation of an ignition coil. The function of any ignition coil is to convert a low voltage, usually 12 volts, into a voltage high enough, 35,000 volts and up, to jump the spark plug gap and ignite the fuel-air mixture in the combustion chamber. It performs this function by making use of the principle of induction. The inside of a coil consist of primary and secondary windings of wire coiled around a vertically mounted soft-iron core. Because of the ratio of primary to secondary windings, a small input voltage is transformed into a very large output voltage.
What you will need:
¼ Drive Socket Set
Dielectric Grease
Regular Blade Screwdriver
Phillips Screwdriver
Specifications for your coil(s)
Needle Nose Pliers
Ohmmeter
Spark Plug Tester
Before You Start:
Follow these instructions carefully. Read and be sure you understand them before you begin.
Gather together all of your tools and supplies before you begin.
Allow plenty of time to do the job so you don't have to hurry.
Remember that these are general instructions. For more detailed instructions pertaining to your specific vehicle, consult an appropriate repair manual.
Safety is important whenever you're working around machinery. Beware of hot objects, sharp instruments and hazardous materials.
Don't substitute tools unless you're sure you won't compromise either your safety or the performance of your vehicle.
Never work on a vehicle that is only supported by a jack. Use jack stands to support the vehicle while you work. Work on a solid, level surface. Never jack a car up on dirt or grass.
When taking ohm readings, it is best to disconnect the negative battery cable..
Disconnecting the battery will cause the erase preprogrammed electronic radio stations. Write down radio presets and be sure you have your radio security code, if applicable.
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