Fuel System:
* Fuel pump: A failing fuel pump might not deliver enough fuel at the required pressure, leading to the engine stalling. Listen for the fuel pump's whine when you turn the key to the "on" position (before cranking). A weak or absent whine suggests a problem.
* Fuel filter: A clogged fuel filter restricts fuel flow, causing similar symptoms to a failing fuel pump.
* Fuel pressure regulator: A malfunctioning regulator can cause erratic fuel pressure, leading to stalling.
* Dirty injectors: Clogged or malfunctioning fuel injectors prevent proper fuel delivery to the cylinders.
Ignition System:
* Crankshaft Position Sensor (CKP): This sensor tells the computer the engine's rotational position. A faulty CKP sensor will cause the engine to stall unexpectedly.
* Cam Position Sensor (CMP): Similar to the CKP, a bad CMP sensor disrupts the timing and can cause stalling.
* Ignition coil: A failing ignition coil can prevent spark to one or more cylinders.
* Ignition module: This controls the spark to the coils. A faulty module can cause intermittent or complete loss of spark.
* Worn distributor cap and rotor (if applicable): While less common on later models, these parts could cause intermittent spark issues.
Other Potential Causes:
* Mass Airflow Sensor (MAF): A faulty MAF sensor provides incorrect air/fuel mixture information to the computer, potentially leading to stalling.
* Throttle Position Sensor (TPS): An inaccurate TPS reading can cause the engine to mismanage the air/fuel mixture.
* PCV valve: A clogged PCV valve can cause excessive crankcase pressure, affecting engine performance and potentially leading to stalling.
* Alternator: A failing alternator won't charge the battery, and eventually the engine will die when the battery is depleted. Check the battery voltage while the engine is running.
* Vacuum leaks: Leaks in vacuum lines can disrupt engine operation and cause stalling.
* Engine coolant temperature sensor: An inaccurate reading from this sensor can cause the engine to run lean or rich and stall.
* Computer/ECM Issues: While less common, a problem with the engine control module itself can cause erratic behavior and stalling.
Troubleshooting Steps:
1. Check the obvious: Start with the simplest checks: Battery voltage, fuel level, and any obvious vacuum leaks.
2. Listen for the fuel pump: Turn the key to "on" and listen for the fuel pump whirring.
3. Check engine codes: Use an OBD-II scanner to retrieve any diagnostic trouble codes (DTCs) stored in the car's computer. These codes provide valuable clues about the problem.
4. Visual inspection: Look for any loose wires, corroded connections, or obvious signs of damage in the engine bay.
5. Systematic approach: Based on the results of the initial checks, you can start testing individual components (e.g., testing fuel pressure, checking sensor readings).
Recommendation: Unless you're comfortable working on cars and have the necessary tools, it's best to take your Camaro to a qualified mechanic for diagnosis and repair. The problem could be simple or complex, and improper diagnosis can lead to further damage or unnecessary expense.
