However, before jumping to conclusions about the coil, you should also consider other possibilities:
* Ignition Control Module (ICM): This module controls the coil's operation. A faulty ICM can prevent the coil from firing.
* Distributor Cap and Rotor: These components distribute the high voltage to the spark plug wires. Worn or damaged components can prevent spark.
* Spark Plug Wires: Cracked or damaged wires can prevent the high voltage from reaching the plugs.
* Crankshaft Position Sensor (CKP): This sensor tells the computer the engine's rotational position, allowing for proper timing of the spark. A bad sensor will prevent sparking.
* Ignition Switch: A faulty ignition switch might not be sending power to the ignition system.
* Fuses and Relays: Check the fuses and relays associated with the ignition system.
To diagnose the problem effectively, you should:
1. Check for power at the coil: Use a multimeter to check for power at the coil's positive terminal when cranking the engine. If there's no power, trace the wiring back to find the problem.
2. Inspect the distributor cap and rotor: Check for cracks, burns, or corrosion.
3. Inspect spark plug wires: Look for cracks, damage, or loose connections.
4. Test the coil: While you can test the coil with a multimeter, it's often easier to borrow a known good coil to test if that resolves the issue.
5. Check for codes: If your car has an OBD system (though 1988 might be borderline), check for any diagnostic trouble codes.
Replacing the coil is relatively inexpensive, but it's crucial to identify the root cause before replacing parts unnecessarily. A systematic approach using testing is the best way to diagnose the problem.
