Here's a breakdown of troubleshooting steps:
* New Key Programming: Ensure your new keys are properly programmed to your vehicle's computer. A new ignition cylinder requires reprogramming the keys' transponder chips, or the car's computer won't recognize them, preventing the engine from starting, even if it cranks. You'll likely need a locksmith or dealership to do this.
* Ignition Switch: While you replaced the *cylinder*, the *switch* itself (the part that actually engages the starter) might be faulty. This is a separate component. If the key turns, but nothing happens, suspect the switch.
* Starter Motor: The starter motor is responsible for cranking the engine. It could be failing, seized, or have a faulty solenoid. Listen carefully when you turn the key; if you hear a click or nothing at all, the starter is a prime suspect.
* Battery and Connections: A weak battery or corroded battery terminals can prevent the engine from turning over. Check the battery voltage and clean the terminals.
* Neutral Safety Switch: On automatic transmissions, the neutral safety switch prevents starting unless the transmission is in Park or Neutral. If this switch is faulty, the car won't start, even with a properly programmed key.
* Wiring: A problem in the wiring between the ignition switch, starter motor, and other components can prevent starting. This is a more complex issue to diagnose.
* Immobilizer System: Your Ford Explorer may have a sophisticated anti-theft system that's preventing starting. Even with new keys and a new ignition cylinder, if the system is malfunctioning, it will block the engine.
What to do next:
1. Verify Key Programming: This is the most likely culprit. Get the keys properly programmed.
2. Listen Carefully: When you turn the key, what sounds do you hear? A click? Nothing? This will help pinpoint the problem.
3. Check Battery Voltage: Use a voltmeter to check the battery's voltage.
4. Inspect Wiring: Look for any loose or damaged wiring around the ignition switch and starter motor.
5. Seek Professional Help: If you're not comfortable diagnosing electrical problems, take your Explorer to a mechanic or auto electrician. They have the tools and expertise to properly diagnose the issue.
Ignoring the key programming aspect is the most common reason why replacing the ignition cylinder doesn't fix the starting problem. Get that sorted first.
