If your Mustang isn't starting or running properly, here are some possibilities and what to check:
* Dead Battery: This is the most common cause of no-start issues. Check the battery voltage and have it tested if needed.
* Faulty Fuel Pump: A failing fuel pump can cut off fuel supply. This often requires professional diagnosis and replacement. You might hear a humming sound from the fuel pump when you turn the ignition on – if you don't hear it, it could be a sign of a problem.
* Fuel Filter Clog: A clogged fuel filter will restrict fuel flow. This is a relatively easy replacement, and if your Mustang is quite old, it's probably due for a change.
* Bad Crankshaft Position Sensor (CKP): This sensor tells the PCM the engine's rotational position. A faulty one prevents the engine from starting.
* Ignition System Problems: This includes issues with the ignition coil, spark plugs, or wires.
* PCM Problems: A failing PCM can cause a variety of issues, including fuel delivery problems. This is a more complex problem requiring professional diagnosis.
* Inertia Switch (sometimes called a crash switch): Some older vehicles have a manual inertia switch that cuts off fuel in a collision. This is usually found under the dash or in the engine bay. However, this is less common in 2004 Mustangs. Check your owner's manual to be sure.
What you should do:
1. Check the obvious: Battery voltage, fuel level (is the tank actually low?), and check for any obvious damage to fuel lines or components.
2. Consult your owner's manual: It might offer troubleshooting steps for starting problems.
3. Get a professional diagnosis: If you can't identify the problem yourself, take your Mustang to a qualified mechanic or auto repair shop. They have the tools and expertise to diagnose the underlying cause and fix it safely and effectively. Trying to fix fuel system problems without proper knowledge can be dangerous.
Don't assume there's a simple "reset" switch for a fuel cutoff. Focus on identifying the actual cause of your fuel-related issue.
