Repair Guide - 2007 Ford Focus Ignition Coil replacement
This guide explains how to diagnose and replace a failed ignition coil on a 2007 Ford Focus. This is a common non-typical problem with this model.
Tools and Materials Needed:
- Ignition Coil
- Screwdriver set
- Multimeter
- Anti-seize compound
- Socket set
- Ratchets and extensions
Diagnostic Steps:
- Start the engine and listen for a misfire. If the engine runs rough or doesn't run smoothly, it may be a sign that the ignition coil is failing.
- Scan the computer using a professional-grade scanner. If the scanner shows an ignition coil-related fault code, this confirms the diagnosis.
- Using a multimeter, check the primary and secondary resistance of the ignition coil. If the resistance is not within the manufacturer's specified range, the coil needs replacement.
Repair Steps:
- Remove the plastic cover from the top of the engine. This will generally involve removing a few small bolts or screws.
- Disconnect the electrical connector from the ignition coil. Be careful not to pull on the wires directly.
- Remove the bolts securing the ignition coil to the engine and carefully pull the old coil out.
- Before installing the new ignition coil, apply a small amount of anti-seize compound to the spark plug well to ensure a good electrical connection.
- Install the new coil, securing it with the original bolts. Reconnect the electrical connector.
- Start the engine to verify the repair. If the engine misfires are gone and the engine runs smoothly, the repair is complete.
Pitfalls and Tips:
- Pitfall: If the new ignition coil doesn't solve the problem, the spark plug or the plug wire may be the issue.
- Tips: Always use a high-quality, brand-name coil to ensure longevity. Generic brands may fail prematurely.