Ignition Coils

Although the fundamentals of an ignition coil have not changed, the demands placed onthem have. Tighter emissions regulations, less engine space and requirements for better fuel economy and higher ignition voltage – up to 45,000 volts in modern cars - means that coil technology is constantly evolving. As a leading OE manufacturer, Delphi has been at the forefront of many of these changes. With more than 100 years of OE ignition system expertise, we’ve created advanced magnetic design and modelling capabilities that are second to none. The result, an efficient coil design that delivers optimum engine performance, exhaust emissions and fuel economy.

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Optimum wire length

More wire generates differences in voltage, and in turn extra pressure, that can cause the breakdown of insulation and wire coatings. So, we tightly control the length of wire between adjacent primary and secondary windings. The result? Our secondary winding is thinner and much longer than the primary in order to get the output needed for the voltage to jump the spark plug gap.

Smart processes

Ignition coil windings should also be evenly distributed and neatly wrapped. That’s why we wind both primary and secondary coils as smoothly and tightly as possible, directly onto a proprietary steel core. This approach helps to ensure maximum magnetic power in every turn of the wire. We also wind our secondary coils into more bays than many of our competitors for more consistent voltage distribution and reliable coil performance.

High quality components

We only ever use high-quality wires, and coating that resists the cracks, pin holes and imperfections that might cause other ignition coils to fail. A special Epoxy helps insulate these wires and keeps them separated. Gaps in the epoxy can reduce the integrity of the insulation, so we also employ a special vacuum technique to remove air bubbles and imperfections, and help prevent internal arching and shorts.

The Delphi Difference

100 years of OE experience, supplier to the world’s top automakers
OE heritage and knowledge built into every aftermarket part
Comprehensive portfolio for a wide range of vehicles and model years
Streamlined SKUs for easy inventory management
Support through tools, tips and training

Related product resources and downloads

Delphi Technologies Expert replacing an Ignition Coil.

Ignition 1 min read

How to replace an ignition coil

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Ignition Vehicle Electronics & Engine Management How to Technicians 1 min read

Resource Highlights

A failing ignition coil can lead to a variety of issues. Follow our steps for a complete removal and refit.

How do I gain access to the ignition coil?

Before you do anything, you first need to remove the scuttle panel, oil cap and engine cover so that you can get to the ignition coil. Remember to gently lift the engine cover taking care not to over-stress the wires going over the engine bay.

How do I remove the ignition coil itself?

This is simple to do once you’ve gained access to the ignition coil. Just release the locking clip, then remove the electrical harness. The ignition coil is now ready to be removed.

How do I securely fit the new ignition coil?

Ensure the new ignition coil is central over the spark plus. Place it firmly downwards to make a good weatherproof seal. Once you’ve done this, take the electrical harness and place it over the connector of the ignition coil and slowly push down the locking clip until you hear a click that it’s in place. Now, replace the removed engine cover, oil cap and scuttle panel.

Do I need to use a diagnostic tool?

After you’ve fitted the new ignition coil, you then need to clear any fault codes and check it is working correctly using a diagnostic tool. Check in the DS diagnostic tool help file to see if an engine adaptation reset is required