Should I replace all the ignition coils at once?

On a vehicle with any mileage, generally yes. Coils age together and a failing one is often the result of firing a worn plug, so replacing a single coil frequently just moves the misfire to the next cylinder within months.

What are the symptoms of a failing ignition coil?

A rough idle, a stumble or hesitation under acceleration, poor fuel economy, and a check-engine light — flashing rather than steady if the misfire is severe enough to risk the catalytic converter.

Are the spark plugs pre-gapped?

Yes. Modern plugs are gapped at the factory and most iridium and platinum types should not be re-gapped by hand, because bending the fine centre electrode damages it. Check the gap rather than adjust it.

Delphi Ignition Coil and Spark Plug Set

Delphi · SKU SAP-00129 · Our ref TC3089

This set supplies one ignition coil and one spark plug per cylinder. They are bundled because a coil usually fails after being asked to fire a worn plug, so replacing a single coil often just moves the misfire to the next cylinder. Symptoms are a flashing check-engine light, a rough idle, or a stumble under acceleration.

Supplied by Delphi.

In the box: One ignition coil per cylinder; One spark plug per cylinder, pre-gapped; Dielectric grease.

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Specifications

Imperial first, metric alongside.

Includes: One ignition coil per cylinder; One spark plug per cylinder, pre-gapped; Dielectric grease
Shipping: Parcel
CoreCharge: No

Common questions

Should I replace all the ignition coils at once?: On a vehicle with any mileage, generally yes. Coils age together and a failing one is often the result of firing a worn plug, so replacing a single coil frequently just moves the misfire to the next cylinder within months.
What are the symptoms of a failing ignition coil?: A rough idle, a stumble or hesitation under acceleration, poor fuel economy, and a check-engine light — flashing rather than steady if the misfire is severe enough to risk the catalytic converter.
Are the spark plugs pre-gapped?: Yes. Modern plugs are gapped at the factory and most iridium and platinum types should not be re-gapped by hand, because bending the fine centre electrode damages it. Check the gap rather than adjust it.

Checking the fit

We confirm the fit by hand on every order. Send your VIN, or the year, engine and trim, and a person checks this part against it before you pay.

Ignition Coil and Spark Plug Set by vehicle — prices, what owners report to NHTSA, and the recalls to check first:

Delphi Ignition Coil and Spark Plug Set

Specifications

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Common questions

Checking the fit