Spark plug wires carry the electrical signal from the ignition system to the spark plugs to ignite the fuel in the combustion chamber. Symptoms of faulty spark plug wires include a decrease in engine power and acceleration, reduced fuel efficiency, and the check engine light illuminating. To replace the spark plug wires, the battery must first be disconnected. Then each wire is removed one by one by pulling upward on the boot end only, ensuring the new wire is the same length. Finally, the battery is reconnected.

1. What is Spark Plug Wires and How Do Replace Spark Plug Wires of My Car
What is Spark Plug Wires?
The purpose of your vehicle’s spark plugs is to ignite the fuel and air available in the combustion
chamber. They do this because of a signal received from the computer module or distributor cap.
If the ignition cable, or spark plug wire, carrying this signal fails, the operation of the engine becomes
mistimed and under-powered. One or more cylinders will misfire or weaken. Another result of the fuel
and air not combusting completely is a buildup of gases and residue in your injectors or cylinders.
Symptoms of a Bad or Failing Ignition Cable:
1. The decrease in power, acceleration, and fuel efficiency:
One of the most common symptoms of an issue with the Spark Plug is engine performance problems.
The Spark Plug carries the spark from the coil and distributor to the spark plugs so that engine
combustion can occur. If there is any issue with the spark plug wires the engine spark can be disturbed,
which can result in engine performance issues such as misfires, a reduction in power and acceleration,
as well as a reduction in fuel efficiency. In severe cases, bad cables may even result in engine stalling.

2. 2. Check Engine Light comes on:
Another symptom of a potential issue with the Spark Plug is an illuminated Check Engine Light. Faulty
cables can lead to engine misfires as well as excessively rich air-fuel ratio, both of which can set off the
Check Engine Light if detected by the computer. A Check Engine Light can also be set off by a number of
other performance issues, so having the computer scanned for trouble codes is highly recommended.
Replacing the Spark Plug Wires:
Step 1: Disconnect the battery. Disconnect the negative battery cable to cut power to the Spark Plug.
Step 2: Locate the Spark Plug. The cables will be routed from the spark plugs on the top of the cylinders
to the distributor cap or module that powers them.
Step 3: Replace the cables. One by one, remove and replace the spark plug wires. To remove an old
cable, pull directly upward on the boot of the cable on the spark plug end, and then pull upward on the
boot connected to the distributor cap or module. Be sure to only pull on the boot; DO NOT pull on the
cable itself. Make sure that the length of the cable you disconnected is the same as the length of the
new cable. Extra wire is unnecessary and your engine may not have room to compensate
Step 4: Reconnect the battery. Reattach the negative battery cable to the terminal to restore power.

3. For more error code diagnostic and repair tips, feel free to contact us at PARTSAVATAR CAR INTERIOR &
EXTERIOR PARTS, TORONTO, our professional mechanics will help you to diagnose and fix it.