Distributor Cap and Rotor: Inspect the distributor cap and rotor for cracks, corrosion, or other damage. Replace them if necessary. Ensure the rotor is seated correctly and there is adequate contact between the rotor and the distributor cap terminals.
Distributor Pick-up Coil: This is responsible for sending a signal to the ignition module when the engine is cranking. Test the pick-up coil resistance with a multimeter and replace it if the resistance is out of specifications or the coil is damaged.
Ignition Module: The ignition module controls the spark timing and provides the trigger signal to the ignition coil. Inspect the ignition module for any signs of damage, such as cracks, burnt components, or loose connections. Test the module according to the manufacturer's specifications.
Wires and Connections: Check all the ignition wires, coil wires, and other electrical connections related to the ignition system for damage, rust, or poor connections. Clean or replace the terminals as needed.
Computer System: If your 1985 Toyota pickup has an electronic ignition system, there might be an issue with the computer (ECU) that controls the ignition process. Consider scanning the vehicle for error codes related to the ignition.
Grounding: Check the engine grounding straps and connections. Ensure they are clean, secure, and provide a good electrical connection between the engine and the vehicle's chassis.
It's recommended to use a systematic approach to diagnose the issue by thoroughly inspecting and testing each component in the ignition system. Consulting a qualified mechanic or referring to the specific workshop manual for your vehicle's model and year can provide additional guidance and troubleshooting steps.
