* Injector Issues: This is the most likely culprit. One or more fuel injectors might be clogged, faulty, or not receiving the proper electrical signal to open and spray fuel. This could be due to:
* Clogged injectors: Dirt, debris, or varnish buildup can prevent proper fuel flow.
* Faulty injector solenoids: The electrical component that controls the injector's opening and closing might be malfunctioning.
* Low injector voltage/wiring problems: A weak signal from the PCM (Powertrain Control Module) due to damaged wiring or a faulty PCM.
* Fuel Pressure Problems: While you say fuel is getting *to* the engine, the pressure might be insufficient. This could stem from:
* Faulty fuel pump: The pump might be weak or failing to deliver enough pressure.
* Clogged fuel filter: A restricted filter limits fuel flow, reducing pressure at the injectors.
* Fuel pressure regulator: This component might be faulty, allowing too little pressure to reach the injectors.
* Vacuum Leaks: A significant vacuum leak can affect the operation of the fuel pressure regulator and potentially disrupt fuel delivery, although this is less likely to completely stop fuel from reaching the cylinders.
* Ignition System Problems: While fuel is necessary for combustion, a weak spark or a missing spark in one or more cylinders could also contribute to a lack of combustion even with fuel present in the intake manifold. This would manifest as misfires or a complete lack of power from a particular cylinder. You need to check spark as well.
* Intake Manifold Leaks: A large leak in the intake manifold could cause a significant loss of vacuum, resulting in poor or inconsistent fuel delivery to the cylinders.
* Computer/PCM Problems: The PCM controls fuel injection. A faulty PCM could send incorrect signals to the injectors, leading to the problem.
Troubleshooting Steps:
1. Check for spark: Ensure that you have spark at each spark plug. This is crucial to eliminate this possibility.
2. Check fuel pressure: Use a fuel pressure gauge to measure the pressure at the fuel rail. This will help diagnose fuel pump or regulator issues.
3. Inspect fuel injectors: Visually inspect the injectors for signs of damage or leaks. Ideally, you'd use a fuel injector tester to check their operation.
4. Check fuel filter: Replace the fuel filter, as it's a relatively inexpensive part that can cause significant problems.
5. Check for vacuum leaks: Inspect all vacuum lines and the intake manifold for leaks.
6. Scan for codes: Use an OBD-II scanner to read any diagnostic trouble codes stored in the PCM. This will give you clues about potential problems.
It's unlikely to be just *one* single problem. A systematic approach, checking the points above, is required. If you are not comfortable working on your engine, take it to a qualified mechanic. Attempting repairs without proper knowledge can lead to further damage.
