Possible Causes:
* Compression Issues: Even with fuel and spark, the engine needs sufficient compression to ignite the fuel mixture.
* Low compression: Could be caused by worn piston rings, a blown head gasket, or valve issues.
* Check: Use a compression tester to measure compression in each cylinder.
* Timing Issues: The spark needs to occur at the precise moment the fuel mixture is compressed.
* Timing belt/chain issues: Worn or broken timing components can lead to improper timing.
* Check: Inspect the timing belt/chain for wear and tear. Ensure the timing marks are aligned correctly.
* Fuel Delivery Problems: While it's getting fuel, the amount or pressure might be insufficient.
* Clogged fuel filter: Restricts fuel flow.
* Faulty fuel pump: Not delivering enough pressure.
* Check: Replace the fuel filter. Test fuel pressure at the fuel rail.
* Electrical Problems: Even with spark, there could be issues with the ignition system.
* Faulty spark plugs/wires: Weak or misfiring spark.
* Ignition coil: Not providing enough voltage.
* Check: Replace worn spark plugs and wires. Test the ignition coil for proper output.
* Air Intake Issues: An obstruction in the intake manifold can prevent the engine from drawing in enough air.
* Clogged air filter: Restricting airflow.
* Intake manifold leak: Drawing in unmetered air.
* Check: Replace the air filter. Inspect the intake manifold for cracks or leaks.
* Starter Issues: The starter motor might not be engaging or turning the engine over.
* Faulty starter: Worn out or damaged starter motor.
* Battery Issues: Weak or dead battery.
* Check: Test the starter motor by jumping it. Check the battery voltage and amperage.
Troubleshooting Steps:
1. Check for fuel: Remove the fuel line at the injector rail and see if fuel is flowing freely.
2. Check for spark: Remove a spark plug wire, ground it to a metal part of the engine, and crank the engine to check for spark.
3. Check for compression: Use a compression tester.
4. Inspect the timing belt/chain: Look for wear, damage, or misalignment.
5. Inspect the fuel filter: Replace if necessary.
6. Test the fuel pressure: Use a fuel pressure gauge.
7. Inspect the spark plugs and wires: Replace if necessary.
8. Test the ignition coil: Check for proper output.
9. Inspect the air filter and intake manifold: Ensure they are clean and free of leaks.
10. Test the starter motor: Jump it to see if it engages.
Important Notes:
* Safety First: Disconnect the battery before working on the ignition system or fuel lines.
* Consult Repair Manuals: Refer to your vehicle's repair manual for detailed instructions and specifications.
* Professional Assistance: If you're not comfortable with automotive repairs, seek professional help from a qualified mechanic.
Let me know if you have more information or want to explore a specific area in more detail.
