1. Ignition System:
* Distributor Cap and Rotor: Check for cracks, wear, or corrosion on the cap and rotor. Replace if needed.
* Spark Plugs and Wires: Inspect the spark plugs for wear, fouling, or damage. Make sure the wires are securely connected and in good condition.
* Ignition Coil: A faulty coil will prevent spark. Test the coil's output with a spark tester or multimeter.
* Ignition Control Module (ICM): The ICM controls the timing and spark. This can be tricky to test without a specific tool, but a common symptom is intermittent starting issues.
* Crank Position Sensor (CPS): This sensor tells the ICM when to fire the spark. If it's faulty, you won't get a spark. You can test its resistance with a multimeter.
2. Fuel System:
* Fuel Pump: Even though you think you have fuel, the pump may be weak or failing. Listen for the fuel pump priming when you turn the key to the "on" position.
* Fuel Filter: A clogged filter can restrict fuel flow. Replace it.
* Fuel Pressure Regulator: A faulty fuel pressure regulator can cause low fuel pressure.
* Fuel Injectors: Inspect the injectors for clogs or damage. They can be tested with a fuel pressure gauge or injector tester.
3. Other Considerations:
* Battery: Ensure the battery has enough charge. A weak battery can sometimes affect the ignition system.
* Timing Belt/Chain: If your timing belt/chain has jumped, your valves and pistons won't be in sync, resulting in no spark. Check the timing belt/chain condition.
Troubleshooting Tips:
* Start Simple: Always start with the easiest and most common issues first.
* Use a Test Light or Multimeter: These tools can help you isolate problems in the ignition system and fuel system.
* Check for Codes: If your truck has an OBD-II port, use a code reader to see if any diagnostic trouble codes are stored.
* Visual Inspection: Before starting, visually inspect the wiring harnesses and connectors for damage or corrosion.
Important Safety Note:
* Be careful working around car parts: Avoid touching wires or components while the engine is running. Disconnect the battery when working on the electrical system.
Let me know if you have any further questions.
