* Fuel Delivery Problems: This is the most common reason. Starting fluid provides a highly flammable vapor that ignites easily, allowing the engine to crank and briefly run. However, once the fluid is gone, the engine needs a proper supply of fuel from the:
* Fuel Pump: It might be failing, not delivering enough fuel pressure, or completely broken.
* Fuel Filter: A clogged filter restricts fuel flow.
* Fuel Injectors: They could be clogged, faulty, or have low fuel pressure.
* Fuel Lines: Leaks or blockages in the fuel lines will prevent fuel from reaching the engine.
* Ignition System Problems: Even if fuel is delivered, the engine won't run if the spark isn't strong enough.
* Spark Plugs: They might be worn, fouled, or damaged.
* Ignition Coils: These can fail and not produce sufficient spark.
* Ignition Wires/Distributor (older cars): Damaged wires or a malfunctioning distributor can interrupt the spark.
* Crankshaft Position Sensor (CPS) or Camshaft Position Sensor (CMP): These sensors tell the computer the engine's rotation, and a faulty sensor can prevent proper ignition timing.
* Vacuum Leaks: A significant vacuum leak can disrupt the engine's air-fuel mixture, making it difficult to stay running even if fuel and spark are present. This is less likely but should be considered.
* Other Possibilities:
* Mass Airflow Sensor (MAF): A faulty MAF sensor can provide incorrect air readings, leading to a poor air/fuel mixture.
* Throttle Position Sensor (TPS): A bad TPS can also cause problems with the air/fuel mixture.
What to do:
1. Safety First: Work in a well-ventilated area. Starting fluid is highly flammable.
2. Don't keep trying: Repeatedly using starting fluid can damage the engine.
3. Check for Obvious Issues: Look for any visible fuel leaks, damaged wires, or loose connections.
4. Professional Help: This is beyond a simple DIY fix for most people. Take your car to a qualified mechanic. Trying to diagnose and fix fuel system or ignition issues without proper knowledge can be dangerous and may lead to further damage. The mechanic will have the tools (fuel pressure gauge, etc.) to diagnose the problem accurately.
Trying to troubleshoot this yourself without experience could be risky and potentially lead to further damage. A professional diagnosis is recommended to safely identify and resolve the issue.
