1. Ignition Coil: Even with a new distributor, the ignition coil itself could be faulty. Test it for proper resistance using a multimeter. The specifications should be in your car's repair manual. A visual inspection for cracks or damage is also worthwhile.
2. Ignition Control Module (ICM): This is a common point of failure in many vehicles, including the Mitsubishi-based Eagle Summit. The ICM controls the timing and firing of the ignition coil. It's often located near the distributor or firewall. These can be difficult to test without specialized equipment, so replacement is sometimes the easiest solution if you suspect it.
3. Crankshaft Position Sensor (CKP Sensor): This sensor tells the computer the engine's rotational speed and position. Without a proper signal from the CKP sensor, the computer won't send the signal to fire the ignition coil. It's typically located on the engine block near the crankshaft pulley.
4. Camshaft Position Sensor (CMP Sensor): Similar to the CKP sensor, but monitors the camshaft. A faulty CMP can prevent the ignition system from working properly.
5. Wiring and Connections: Carefully inspect all wiring related to the ignition system, from the distributor to the coil, ICM, and computer. Look for broken wires, corrosion, loose connections, or damaged connectors. Pay close attention to the ground wires, as a poor ground can cause all sorts of electrical gremlins.
6. Computer (ECU): While less likely, a faulty engine control unit (ECU) could be responsible. This is a more involved diagnosis and often requires professional equipment.
7. Distributor Cap and Rotor: Although you have a new distributor, double-check the cap and rotor for cracks, carbon tracking, or worn contacts. Even a seemingly new distributor can have internal issues.
8. Fuel Pump Relay: Though seemingly unrelated to spark, a faulty fuel pump relay could prevent the ignition system from functioning. Some systems require the fuel pump to be running before the ignition system will work.
Troubleshooting Steps:
1. Check for power at the coil: With the ignition on, use a multimeter to test for battery voltage at the coil's positive terminal. There should be power.
2. Check for a ground: Ensure the coil has a good ground connection.
3. Test the ignition coil resistance: Use a multimeter to test the coil's primary and secondary resistance against factory specifications.
4. Check all fuses and relays: Ensure all fuses related to the ignition system are intact and relays are working properly.
5. Visual inspection: Thoroughly inspect all wiring and connectors in the ignition system.
If you're not comfortable performing these tests, take it to a qualified mechanic. They'll have the tools and expertise to diagnose the problem accurately. Remember to always disconnect the negative battery cable before working on the electrical system.
