1. Fuel System:
* Fuel Pump: A weak or failing fuel pump might provide enough fuel for the initial start but not enough to sustain running. Listen for the pump's whirring sound when you turn the key to the "on" position (before cranking). If you don't hear it, the pump might be bad. Low fuel in the tank can also mimic this.
* Fuel Filter: A clogged fuel filter restricts fuel flow. This is a relatively inexpensive and easy part to replace.
* Fuel Injectors: Clogged or faulty injectors can prevent sufficient fuel delivery. This often requires specialized tools and knowledge to diagnose.
* Fuel Pressure Regulator: This regulates fuel pressure in the system. A faulty regulator can cause erratic fuel delivery.
2. Ignition System:
* Distributor (if applicable): Older Celebrity models might have distributors. Worn points, a bad rotor, or a failing ignition coil could prevent sustained running.
* Ignition Coil: This provides the high voltage to the spark plugs. A failing coil can cause intermittent or weak sparking.
* Spark Plugs & Wires: Worn, fouled, or loose spark plugs or damaged wires prevent proper ignition. Inspect for cracks, corrosion, or gaps that are outside the specifications.
* Crankshaft Position Sensor (CKP Sensor): This sensor tells the engine's computer where the crankshaft is. A faulty CKP sensor can prevent the engine from receiving the signals it needs to stay running.
* Cam Position Sensor (CMP Sensor): Similar to the CKP sensor, but for the camshaft. A faulty CMP sensor will also prevent the engine from running properly.
3. Air Intake System:
* Vacuum Leaks: Leaks in the intake manifold or vacuum lines can disrupt the air/fuel mixture, causing the engine to stall. Listen carefully for hissing sounds around the intake manifold.
* Mass Airflow Sensor (MAF Sensor): This sensor measures the amount of air entering the engine. A dirty or faulty MAF sensor can provide incorrect readings, leading to a poor air/fuel mixture.
* Throttle Position Sensor (TPS): This sensor tells the engine computer the position of the throttle. A faulty TPS can cause the engine to run poorly or stall.
* Air Filter: A severely clogged air filter restricts airflow, starving the engine of oxygen.
4. Other Potential Causes:
* Idle Air Control (IAC) Valve: This valve regulates airflow at idle. A dirty or faulty IAC valve can cause stalling.
* Computer/ECM Problems: While less common, a failing engine control module (ECM) can cause various problems, including stalling. This typically requires professional diagnosis.
* Coolant Temperature Sensor: An inaccurate reading from this sensor can cause the engine to run lean and stall.
Troubleshooting Steps:
1. Check the basics: Make sure the battery is fully charged, and all connections are secure.
2. Listen for unusual sounds: Pay attention to hissing (vacuum leaks), whirring (fuel pump), or clicking (ignition).
3. Check engine codes: Use an OBD-II scanner to read any diagnostic trouble codes (DTCs) stored in the car's computer. These codes will give clues to the problem.
4. Visual inspection: Check for obvious problems like loose wires, broken parts, or leaks.
5. Start with the easiest and cheapest fixes: Replace the air filter, check the fuel level, and inspect spark plugs and wires.
If you're not comfortable working on your car, take it to a qualified mechanic for diagnosis and repair. Providing the year of your Celebrity will help narrow down the possibilities, as different models have different systems.
