Sparkplugs are a normal maintenance item that need to be replaced. While most modern sparkplugs are good for 100,000 miles, they are subject to early failure sometimes. You can easily replace your sparkplugs with the right tools. The 2.4 l engine is available in many Toyota, Chrysler and General Motors vehicles; although the engines require different types of sparkplugs, the replacement procedure is bascially the same for all 2.4 l engines since they are all four-cylinders.
Allow the engine to cool off for at least 30 minutes before beginning. Unhook the negative battery cable a few minutes before you start.
Disconnect one sparkplug wire at a time to avoid cross-connecting the wires when you replace the spark plug. If you don't have the sparkplug wire removal tool, you will have to wiggle the wire to disconnect its boot from the sparkplug.
Use the sparkplug socket attachment to remove the sparkplug from the cylinder. This is a good time to inspect the well for contaminants. If you see oil or water in the sparkplug well, you may have an engine problem that caused premature sparkplug failure.
Insert the new sparkplug and carefully tighten with your hand to avoid cross-threading the cylinder thread. After the sparkplug is secure, tighten it with the sparkplug socket.
Reattach the sparkplug wire and repeat the procedure for all four sparkplugs.
