Ignition System Components:
* Cranking the engine: If the engine isn't cranking at all, the problem is *before* the ignition system. Check the battery, cables, starter motor, and ignition switch.
* Ignition Coil: This is a common failure point. A bad coil won't produce the high voltage needed for spark. You can visually inspect it for cracks or damage, but testing with a multimeter is recommended.
* Ignition Module (or Control Module): This controls the ignition coil's firing. A faulty module prevents the coil from receiving the signal to fire. These often require specialized testing equipment.
* Distributor Cap and Rotor: Inside the distributor, these components distribute the high voltage to the spark plug wires. Corrosion, cracks, or worn contacts will prevent proper spark delivery. Inspect for any damage or carbon buildup.
* Spark Plug Wires: Cracked, damaged, or poorly connected wires can interrupt the high-voltage signal to the spark plugs. Visually inspect for cracks or damage. Check the connections at both ends.
* Spark Plugs: While unlikely to *completely* prevent spark (unless severely fouled), faulty spark plugs can significantly weaken or eliminate the spark. Check their condition and gap.
* Ignition Switch: A faulty ignition switch might not be sending power to the rest of the ignition system.
Other Potential Causes:
* Computer/PCM (Powertrain Control Module): The PCM controls many aspects of the engine, including the ignition system. A faulty PCM can disrupt spark. Diagnosing PCM issues requires specialized equipment.
* Crankshaft Position Sensor (CKP): This sensor tells the PCM the position of the crankshaft, allowing it to time the spark correctly. A faulty CKP sensor will prevent spark.
* Cam Position Sensor (CMP): Similar to the CKP sensor, but for the camshaft. Also essential for proper spark timing.
* Wiring Harness: Damaged or corroded wiring anywhere in the ignition system can interrupt the electrical signal. Carefully inspect the entire harness for damage. Look especially at areas prone to wear and tear.
Troubleshooting Steps:
1. Check the basics: Battery voltage, connections, starter.
2. Visual Inspection: Carefully inspect the distributor cap, rotor, spark plug wires, and ignition coil for visible damage.
3. Spark Test: Use an inline spark tester to check for spark at the spark plug wires. This will quickly isolate the problem to either before or after the coil.
4. Multimeter Testing: Test the ignition coil and other components with a multimeter according to the specifications in a repair manual.
5. Professional Diagnosis: If you can't pinpoint the issue, take it to a mechanic or auto electrician. They have the tools and expertise to diagnose more complex problems.
Important Note: Always disconnect the negative battery cable before working on any electrical components in your vehicle to prevent accidental shocks or damage. A repair manual specific to your 1992 Dodge Dakota is highly recommended for detailed diagrams and specifications.
