1. Engine timing: Verify that the engine timing is correct. If the timing is off, the fuel and air mixture will not be properly compressed and the engine will not start.
2. Fuel pressure: Check the fuel pressure to ensure that it is within the specified range. If the fuel pressure is too low, the fuel injectors will not be able to deliver enough fuel to the engine.
3. Fuel injector pulse: Check the fuel injector pulse to ensure that the fuel injectors are receiving a signal to open. If the fuel injectors are not receiving a signal, they will not be able to deliver fuel to the engine.
4. Idle air control valve (IACV): The IACV regulates the amount of air that bypasses the throttle valve when the engine is idling. If the IACV is not functioning properly, the engine may not be able to idle or may stall when the accelerator is released.
5. Throttle position sensor (TPS): The TPS provides information to the engine control module (ECM) about the position of the throttle valve. If the TPS is not functioning properly, the ECM will not be able to properly control the fuel and air mixture.
6. Mass air flow sensor (MAF): The MAF sensor measures the amount of air that enters the engine. If the MAF sensor is not functioning properly, the ECM will not be able to properly control the fuel and air mixture.
7. Oxygen sensor: The oxygen sensor measures the amount of oxygen in the exhaust gas. If the oxygen sensor is not functioning properly, the ECM will not be able to properly control the fuel and air mixture.
If you have verified that all of these items are functioning properly, you may want to consider having a mechanic diagnose the problem.
