Jensen Motors - 1973 - Jensen Interceptor III: Troubleshooting and Repairing Faulty Ignition Coil

A faulty ignition coil can cause a variety of problems with your 1973 Jensen Interceptor III, including misfires, poor fuel economy, and engine stalls. In this guide, we'll walk you through the steps of diagnosing and repairing a faulty ignition coil.

Tools and Equipment Needed:

• Multimeter
• Screwdriver Set
• Replacement Ignition Coil
• Spark Plug Socket
• Mechanic's Gloves
• Safety Glasses

Diagnosing the Problem:

If your Jensen Interceptor III is underperforming, the ignition coil might be at fault. Follow these steps to diagnose the problem:

1. Firstly, inspect the ignition coil for visible damage or oil leakage.
2. Second, use a multimeter to measure the resistance of the ignition coil. The typical resistance readings should be between 0.75 and 0.81 ohms for the primary winding, and between 10,000 and 11,000 ohms for the secondary winding.
3. If the measurements fall outside these ranges, it's likely the ignition coil is faulty and will require replacement.

Replacing the Ignition Coil:

Once you've determined the ignition coil is faulty, follow these steps to replace it:

1. First, disconnect the battery to ensure safety. Remember to wear your mechanic's gloves and safety glasses.
2. Locate the ignition coil. It's typically located on the right side of the engine, near the distributor.
3. Mark the cables connected to the ignition coil to remember their proper location, then remove them carefully.
4. Next, remove the fastening screws with a screwdriver to remove the ignition coil.
5. Once the old coil is removed, install the new ignition coil and reattach the cables according to the marks you made.
6. Reconnect the battery and start the car. If the issue persists, it might be a sign of a more serious problem, requiring professional attention.

Tips for Ensuring a Successful Repair:

• When measuring the resistance of the ignition coil, always double-check your readings. Incorrect readings can lead to a misdiagnosis.
• Be careful not to pull too hard on the cables attached to the ignition coil to avoid causing any damage.
• Consider investing in a quality replacement ignition coil with a warranty to safeguard against future ignition troubles.