How to Replace the Toyota Tundra Spark Plug Wires

Spark plug wires should be inspected each time plugs maintenance occurs.

Spark plugs wires should be visually inspected each time new spark plugs are installed, every 30,000 miles, or every 24 months. Perform a visual inspection in a dark area with the engine running to see if any sparks or arcing is visible, in which case the wire is bad. If sparks are observed, identify the wire with a number and continue to inspect all other wires. Replacing the damaged wires is a matter of only a few steps following identification.

Things You'll Need

• New spark plug wires

Instructions

1. Disconnect a single wire from the spark plug by grabbing onto and twisting the rubber boot until it is free. Do not grasp the wire itself to remove, as it does not effectively remove the boot area from the plug.

2. Disconnect the other end of the wire from the ignition coil by lifting up on the locking mechanism, or claw, and pulling the end of the wire away from the coil.

3. Replace the wire with a new one specific to your engine model. Reconnect the end to the ignition coil and make sure the locking mechanism clips back into place. Then, secure the boot end over the top of the spark plug making sure not to bend the wire sharply during connection.

4. Move on to the next damaged wire, if applicable. Continue replacing wires one by one until all damaged wires have been replaced.

Tips & Warnings

• If wires are mixed up during replacement, it can cause issues with the firing order, so it is imperative that only one wire is replaced at a time.

References

• "Chilton Toyota Tacoma Repair Manual"; Mike Stubblefield; 2005