* Crankshaft Position Sensor (CKP): This sensor tells the computer the engine's rotational position, crucial for timing the spark. A faulty CKP sensor will prevent the engine from firing.
* Cam Position Sensor (CMP): Similar to the CKP, but it monitors the camshaft's position. A bad CMP also prevents proper ignition timing.
* Ignition Coil(s): These deliver the high voltage spark to the spark plugs. A weak or failing coil won't produce enough spark to ignite the fuel. This is more likely if you have multiple cylinders not firing.
* Spark Plugs and Wires: Worn or fouled spark plugs or damaged/loose wires will prevent a strong spark from reaching the combustion chamber.
* Fuel Pump: The fuel pump delivers fuel to the engine. A failing pump might not supply enough fuel pressure, or no fuel at all. You can often check this by listening for the pump's prime when you turn the key to the "on" position (before cranking).
* Fuel Injectors: These spray fuel into the cylinders. Clogged or malfunctioning injectors can prevent proper fuel delivery.
* Fuel Pressure Regulator: This regulates fuel pressure in the system. A faulty regulator could lead to low or inconsistent fuel pressure.
* PCM (Powertrain Control Module): The computer controls the entire ignition and fuel system. A faulty PCM can cause a wide variety of issues, including failure to start. This is less likely, but possible.
* Security System: Some 1999 Dodges have security systems that can prevent the engine from starting if the system detects a problem.
Troubleshooting Steps:
1. Check for obvious issues: Look for loose or corroded connections in the ignition system.
2. Listen for the fuel pump prime: Turn the key to the "on" position (without cranking) and listen for a whirring sound from the fuel pump. If you don't hear it, the fuel pump might be the culprit.
3. Check for spark: Use a spark tester to check if the spark plugs are receiving spark. If not, focus on the ignition coil, wires, and sensors.
4. Check fuel pressure: A fuel pressure gauge is needed to accurately measure fuel pressure. Low pressure points to a pump, regulator, or injector problem.
5. OBD-II Scanner: A scan tool can read diagnostic trouble codes (DTCs) stored by the PCM, which can often pinpoint the problem.
It's highly recommended to have a qualified mechanic diagnose the issue if you're not comfortable performing these checks yourself. Improperly diagnosing and repairing automotive systems can be dangerous.
