Aston Martin Spark Plugs and Coil Packs

Overview

Ignition service on an Aston Martin can range from a satisfying preventative job to an access-heavy exercise better left to a specialist. This guide helps you decide where that line sits and how to approach the work safely.

Applies to: v8-vantage, v12-vantage, db9, db11, dbx, vantage-v8, vantage, db12.

Tools and consumables

Tools

• Socket and extension set: Access varies significantly by model and engine.
• Spark plug socket: Use the correct size and a quality insert.
• Torque wrench: Required for correct plug installation.
• Inspection light: Useful for checking plug wells and surrounding seals.

Consumables

• Correct spark plugs: Use only the exact plug type approved for the engine.
• Coil packs if replacing: Replace suspect coils with known-correct parts.
• Dielectric grease if appropriate: Use only where the official procedure allows it.

Preparation

• Confirm the exact engine variant and the approved plug and coil parts.
• Allow the engine to cool fully.
• Plan access carefully; on some models, time disappears in trim and manifold access rather than the plug change itself.

Access

• Remove covers and intake pieces carefully as required by the model.
• Inspect plug wells for oil, moisture, or debris before removing any coil packs.
• Label coils or connectors if the layout is not immediately obvious.

Remove

• Remove the coil pack and inspect its condition.
• Withdraw the spark plug carefully, noting any abnormal resistance or thread feel.
• Inspect the old plug for clues about mixture, oiling, or heat.

Install

• Install only the exact approved plug at the correct gap if gap adjustment is permitted.
• Torque the plug correctly and refit or replace the coil pack.
• Reassemble intake and trim carefully so no vacuum or wiring issue is introduced.

Final checks

• Start the engine and listen for a clean idle.
• Road-test gently and check for stored fault codes if the car had a previous misfire issue.
• If the misfire remains, move from parts-changing to proper diagnosis.

Torque and specs

When to stop and call a specialist

• If plug threads feel abnormal.
• If access requires more disassembly than you are comfortable refitting correctly.
• If a misfire remains after ignition service, because catalyst damage is then a real risk.