1. Check Fuel Delivery:
- Verify that there is proper fuel pressure at the fuel rail using a fuel pressure gauge.
- Try turning the ignition on and listening for the fuel pump to engage when you turn the key. If you don't hear the fuel pump priming, it could be an issue with the pump itself or its electrical circuit.
2. Check for Spark:
- Remove a spark plug wire from one of the spark plugs and hold the metal end close to the engine block while someone cranks the engine. Look for a strong spark.
- If there's no spark or the spark is weak, the problem could be with the TFI module, ignition coil, ignition module, or related wiring.
3. Check TFI Module and Wiring:
- The TFI module is usually located on the distributor body. Look for any loose connections, corrosion, or damage to the wiring harness connected to the module.
- Disconnect the TFI module connector and check the pins for damage or corrosion. Clean the pins if necessary.
- You can also test the TFI module by using an ohmmeter or following specific diagnostic tests outlined in the repair manual for your vehicle.
4. Check EEC Module:
- The EEC module is typically located in the engine compartment or under the dashboard. Inspect it for any signs of damage or corrosion.
- You may need a diagnostic scanner or specialized knowledge to troubleshoot the EEC module, as it involves accessing and interpreting diagnostic codes.
5. Check Fuel Injectors:
- Listen carefully near the fuel injectors while someone cranks the engine. You should hear a clicking sound from each injector indicating that they are receiving power.
- If you suspect a faulty injector, you can remove it and test its resistance or resistance/flow according to the repair manual.
Remember that diagnosing electrical problems can be challenging and often requires specialized tools and knowledge. If you are not confident in performing these checks, it's advisable to seek assistance from a qualified mechanic or an auto electrical specialist.
