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Corvette: How to Replace Coil Packs

Replacing a bad ignition coil is dead simple. Read on to have your Corvette running on all cylinders in no time.

January 22, 2015

This article applies to C4-C7 Corvettes (1984-2014).

The coil packs that come stock on the Corvette are fairly tough and rarely need replacing; however, sometimes they do fail. A failing coil pack will feel like a dead spark plug and even the diagnostic trouble code will be the same. Luckily, removing the coil packs is as easy as unscrewing a few bolts.

Materials Needed

  • Ignition coils
  • Socket wrench

Step 1 – Disconnect the battery

It is always a good idea to unplug the negative battery terminal when working on a vehicle's electrical system. Disconnect the negative battery terminal (black).

Figure 1. Remove the circled negative battery cable.

Step 2 – Remove engine covers

Simply pull the engine covers off to expose the fuel rails and ignition coils. Check for cracks on the coil packs, signs of melting or any other damage.

Figure 2. Engine covers removed.

Pro Tip

If you have bad ignition coils, don't be tempted to replace them with expensive aftermarket coils for the sake of improved performance. They're not any "better" in a practical sense. They do, however, look great.

Step 3 – Unplug and unbolt ignition coils

Disconnect the ignition coils from the spark plug wire and the electrical connector. Each ignition coil is secured to the fuel rail cover by two bolts. Remove these bolts with a socket wrench and pull the ignition coil away.

  • Figure 3. Unplug ignition wires.
  • Figure 4. Ignition coil bolts.

Step 4 – Re-installation

Installation is the opposite of removal. Replace the blown coil pack with a new one. Tighten the bolts to reconnect the spark plug wires and electrical connectors.

Featured Video: How to Diagnose a Bad Coil Pack

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