1. Verify fuel pressure and volume: Check the fuel pressure regulator and fuel pump to ensure they are functioning correctly.
Ignition System:
2. Check spark plugs and wires: Make sure the spark plugs are in good condition and properly gapped. Test the spark plug wires for resistance.
3. Check ignition coil and distributor cap (if applicable): Ensure the ignition coil is providing sufficient voltage to the spark plugs, and inspect the distributor cap for cracks or damage.
Compression Test:
4. Perform a compression test on all cylinders to ensure adequate engine compression.
Engine Timing:
5. Verify the timing belt or chain is properly aligned and not stretched or damaged.
Air Intake System:
6. Check for any restrictions in the air intake system such as a clogged air filter or dirty throttle body.
Throttle Position Sensor:
7. Inspect the throttle position sensor to make sure it's functioning correctly.
ECM (Engine Control Module):
8. Scan for any trouble codes stored in the Engine Control Module (ECM). This may provide additional clues about the issue.
Fuel Injectors:
9. Check the fuel injector flow rate and operation. Clean or replace them as needed.
Vacuum Leaks:
10. Inspect the vacuum hoses and connections for any leaks.
Fuel Filter:
11. Replace the fuel filter if it is clogged.
Remember to approach the diagnosis systematically, starting with the basics and gradually checking more specific components. It may be helpful to consult a professional mechanic for further assistance if the issue persists.
