Ignition System Components:
* Ignition Control Module (ICM): This is a very common culprit. The ICM receives signals from the crankshaft position sensor and other sensors and then sends the signal to the distributor to create the spark. A faulty ICM will prevent spark entirely.
* Crankshaft Position Sensor (CKP): The engine computer needs this sensor's signal to know where the crankshaft is in its rotation to time the spark. A bad CKP sensor will prevent the computer from sending the signal to the ICM.
* Camshaft Position Sensor (CMP): Similar to the CKP, a faulty CMP sensor can disrupt the timing signals and prevent spark. This is less likely to cause a complete lack of spark than the CKP, often resulting in rough running or misfires instead.
* Ignition Coil: While less likely given you've replaced the distributor, a faulty coil could still be the issue. The coil provides the high voltage needed for the spark. Test it with an ohmmeter.
* Wiring: Check all wiring related to the ignition system. Look for broken, frayed, or corroded wires between the distributor, ICM, coil, and sensors. A poor connection anywhere in the chain can interrupt the signal.
* Ignition Switch: Ensure the ignition switch is functioning correctly. A faulty switch might not be sending power to the ignition system.
Other Possibilities:
* Fuel Pump Relay (or Fuse): Though it seems unrelated to spark, a failed fuel pump relay can sometimes prevent the engine computer from functioning correctly, which in turn can affect the spark. Check the relay and any relevant fuses.
* Engine Computer (PCM): While rare, a faulty PCM can cause all kinds of electrical issues, including a lack of spark. This is usually diagnosed last.
* Incorrect Distributor Installation: Though you've replaced the distributor, double-check its installation. It's possible it's not correctly seated or the rotor isn't properly aligned.
Troubleshooting Steps:
1. Check for power at the coil: With the ignition on, you should have power at the coil. This will eliminate issues with the ignition switch and main wiring.
2. Test the ICM: This is the most likely culprit. You'll need a multimeter or a dedicated ignition system tester to check its output.
3. Inspect all wiring: Carefully examine all wiring related to the ignition system for damage.
4. Test the crankshaft position sensor: This is crucial for proper ignition timing.
5. Verify distributor installation: Make sure the distributor is properly seated and the rotor is aligned correctly.
Important Note: Working on your car's ignition system involves high voltage. Disconnect the negative battery terminal before starting any electrical tests. If you are not comfortable performing these tests, it's best to take your vehicle to a qualified mechanic. They have the tools and expertise to diagnose the problem efficiently and safely.
