Simple Checks (Do these first):
* Fuel:
* Empty Tank: The most obvious – is your gas tank nearly empty? The fuel pump might be struggling to draw fuel.
* Fuel Filter: A clogged fuel filter restricts fuel flow. This is a relatively inexpensive and easy part to replace.
* Fuel Pump: A weak or failing fuel pump might provide enough pressure to start the engine but not enough to keep it running. You might hear a buzzing sound from the fuel pump when you turn the key to the "on" position (but not cranking). A mechanic can test fuel pressure.
* Ignition System:
* Distributor Cap and Rotor: These components wear out over time and can cause intermittent starting problems. Inspect for cracks, corrosion, or burnt contacts.
* Ignition Coil: A failing ignition coil won't provide consistent spark.
* Spark Plugs and Wires: Worn or fouled spark plugs or damaged wires can prevent consistent ignition. Check for cracks, corrosion, or gaps that are out of spec.
* Air Intake System:
* Air Filter: A severely clogged air filter restricts airflow, starving the engine of oxygen. Replace it if it's dirty.
* Vacuum Leaks: Leaks in the vacuum lines can disrupt engine timing and operation. Inspect all vacuum hoses for cracks or disconnections. A hissing sound is a good indicator.
More Complex Issues (Requires more diagnostic tools or a mechanic):
* Computer Problems (ECM/PCM): The Engine Control Module (ECM) or Powertrain Control Module (PCM) could be malfunctioning. This requires more advanced diagnostic equipment.
* Crank Position Sensor (CPS): This sensor tells the computer the engine's rotational speed. A faulty CPS can prevent consistent operation.
* Throttle Position Sensor (TPS): If the TPS is faulty, the computer may not be getting accurate information about the throttle position, leading to running issues.
* Mass Airflow Sensor (MAF): This measures the amount of air entering the engine. A bad MAF sensor can cause erratic running.
* Fuel Injectors: Clogged or malfunctioning fuel injectors can cause the engine to start but not run smoothly.
Troubleshooting Steps:
1. Start with the simple checks. Check the fuel level, air filter, and visually inspect the distributor cap, rotor, spark plugs, and wires.
2. Listen carefully: Are there any unusual noises (clicking, buzzing, hissing)? This can give clues about the problem.
3. Check for error codes: If your Caprice has a check engine light, you might be able to retrieve diagnostic trouble codes (DTCs) using an OBDI scanner (specific to older vehicles like yours). This can point to a specific problem area.
4. Seek professional help: If you're not comfortable working on your car yourself, take it to a mechanic. They have the tools and expertise to diagnose and repair the problem effectively.
Remember safety first when working under the hood. Disconnect the negative battery terminal before starting any work on the electrical system. Good luck!
