Here's a breakdown of where to look next, along with some troubleshooting tips:
1. Fuel System
* Fuel Pump: The fuel pump delivers gas to the engine. Check if it's working by listening for a humming sound near the fuel tank when you turn the ignition key to the "on" position (don't start the engine). If you don't hear it, you may need a new fuel pump.
* Fuel Filter: A clogged fuel filter can prevent fuel from reaching the engine. Check its condition and replace it if necessary.
* Fuel Lines: Ensure the fuel lines are connected properly and free of leaks.
2. Spark Plugs and Wires
* Spark Plugs: Replace the spark plugs. Even if they look decent, they could be worn down or fouled, preventing a strong spark.
* Spark Plug Wires: Inspect the spark plug wires for cracks, worn insulation, or corrosion. If you find any issues, replace the wires.
3. Distributor
* Distributor Cap and Rotor: The distributor cap and rotor are responsible for delivering spark to the spark plugs. Inspect them for cracks, wear, or corrosion. Replace them if necessary.
* Distributor Timing: If the distributor timing is off, it can affect spark delivery. Consider checking and adjusting it.
4. Ignition Coil
* Primary and Secondary Circuits: The ignition coil creates the high voltage needed to ignite the fuel-air mixture. Inspect its primary and secondary circuits for any damage or wear.
5. Sensors
* Crank Sensor: This sensor tells the computer when the engine is turning. If it's faulty, the engine won't start.
* Cam Sensor: This sensor monitors the camshaft's position and helps control ignition timing. A faulty cam sensor can cause starting issues.
6. Electrical System
* Fuses and Relays: Check all relevant fuses and relays for blown or faulty components.
* Wiring: Inspect all wiring for loose connections, shorts, or damage.
* Battery Connections: Ensure the battery terminals are clean, tight, and corrosion-free.
7. Starter
* Solenoid: The solenoid engages the starter motor. Make sure it's working properly.
* Starter Motor: Test the starter motor itself to confirm it's turning over the engine.
Additional Tips
* Check for Codes: Use an OBD-II scanner to check for diagnostic trouble codes. This can help you pinpoint the problem.
* Professional Assistance: If you're not comfortable diagnosing these components yourself, it's best to take the van to a qualified mechanic for a proper inspection.
* Look for Common Issues: Do some research on common problems for your specific model year and engine.
Remember: Troubleshooting automotive issues can be tricky. Be sure to consult your vehicle's owner's manual or a reputable repair manual for specific instructions and safety precautions.
