Distributor Cap and Rotor Replacement 919.637.8833

What is a Distributor Cap and Rotor?

The distributor cap and rotor are essential components in older vehicles with a distributor-based ignition system. They work together to deliver electrical current from the ignition coil to the correct spark plugs, igniting the fuel-air mixture in the engine cylinders.

The distributor cap is a plastic component that holds the ignition system contacts. The rotor is a rotating part inside the cap that sends electrical current to the spark plugs in the correct firing order.

Signs of a Faulty Distributor Cap and Rotor

• Engine misfires
• Rough idle
• Difficulty starting the engine
• Poor acceleration
• Visible cracks or corrosion on the components

How to Replace the Distributor Cap and Rotor: Step-by-Step Guide

Follow these steps to replace your distributor cap and rotor. Make sure to refer to your vehicle's service manual for specific details.

Tools Needed:

• Replacement distributor cap and rotor
• Screwdriver and socket wrench
• Pen and paper (to write down the firing order)
• Anti-seize lubricant (optional)
• Safety gloves and eyewear

Step 1: Safety First

Turn off the engine and disconnect the battery to avoid any electrical accidents while working with the ignition system.

Step 2: Locate the Distributor Cap and Rotor

Find the distributor cap on top of the distributor. The rotor is located inside the cap. The distributor is usually found near the front of the engine.

Step 3: Mark the Firing Order

Before removing the components, note down the firing order of your engine. The firing order specifies the sequence in which electrical current flows to the spark plugs.

Step 4: Remove the Distributor Cap

Unscrew or unclip the distributor cap, being careful not to disturb the rotor’s position. Set the cap aside.

Step 5: Remove the Rotor

Remove the rotor from the distributor shaft. It is usually held in place with a screw or clip. Set the old rotor aside and place the new one on the shaft.

Step 6: Install the New Rotor and Distributor Cap

Place the new rotor on the shaft and secure it. Then, install the new distributor cap, ensuring it aligns with the spark plug wire terminals.

Step 7: Reconnect the Spark Plug Wires

Reconnect the spark plug wires to the correct terminals on the new distributor cap, following the firing order.

Step 8: Reconnect the Battery and Test the Engine

Reconnect the battery, start the engine, and check for proper performance. The engine should start smoothly, idle evenly, and accelerate without hesitation.

Labor Prices for Distributor Cap and Rotor Replacement

The following table outlines the typical labor prices for replacing a distributor cap and rotor in different vehicle types: