1998 Subaru Forester Q&A
1998 Subaru Forester Question: Spark Plug Replacement
You don't need any special tools to change spark plugs. When removing the wires grab the wire by the boot and pull off with a slight twisting motion. If the wires have been on for a while some of them can be stubborn to get off. As for tools needed get the proper size spark plug socket, extention, and ratchet and gap gauge. A universal is also handy to have. When replacing the spark plugs it is often easier to use a piece of rubber hose that the spark plug fits tightly into. Then insert the plug into the hole and turn in. remove hose and tighten with socket. - Dave_sab.
Sometimes the Check Engine Light illuminates because the computer detects misfires. Subaru released an improved spark plug wire set to solve the problem. The ignition coil should also be inspected ...