How to Replace the Ignition Coil in a Chevy Avalanche

On a Chevy Avalanche, either the crankshaft sensor or the powertrain control module (PCM) sends a signal to the ignition module, which triggers the ignition coil. When the ignition coil triggers, it sends a spark to the spark plugs. If the coil is damaged, replace it.

Instructions

1

Determine the type of ignition system on your Chevy Avalanche. In a distributor ignition system, usually found in 7.4L, 5.7L, 5.0L and 4.3L engines, the distributor houses the ignition coils. A distributorless ingition system (DIS), used by 8.1L, 6.0L, 5.3L and 4.8L engines, may use an Avalanche ignition coil, but you won't find a distributor.

2

Disconnect the cable for the negative battery. You may want to wrap a cloth or another non-conductive material around the end to prevent an accidental connection, which could start a fire or electrocute you.

3

Unhook the spark plug wires from the ignition coil. You also need to remove the ignition coil harness electrical connector with a screwdriver.

4

Loosen the bolts that secure the ignition coil with a wrench and release the ignition coil.

5

Put the new Chevy Avalanche ignition coil in place and reassemble the parts. If you have a Torque wrench, tighten the bolts from Step 4 with 106 inch pounds of torque (12 Nm). The bolts usually have self-tapping threads; use extra care to prevent stripping the threads as you work.