Engine Turns Over but Car Won’t Start

Possible Causes

If your engine cranks but doesn’t start, the first thing to check is the fuel supply. Ensure that there is enough fuel in the tank and that the fuel pump is working properly. You can check the fuel pump by listening for a humming sound when you turn on the ignition. If you don’t hear anything, the fuel pump may be faulty.

If the fuel supply is fine, the next step is to check the ignition system. The ignition system is responsible for creating a spark that ignites the fuel in the cylinders. If any component of the ignition system fails, the engine will not start.

Some common ignition-related problems include:

Faulty spark plugs
Worn-out ignition coil
Defective ignition control module
Bad distributor

In addition to fuel and ignition, an engine also needs air to run. If the air intake is blocked or restricted, the engine will not be able to draw in enough air and will not start.

Some common air-related problems include:

Clogged air filter
Faulty mass air flow sensor
Vacuum leak

The electrical system is responsible for powering the engine’s electrical components, including the fuel pump, ignition system, and starter motor. If there is a problem with the electrical system, it can prevent the engine from starting.

Some common electrical-related problems include:

Dead battery
Loose or corroded battery terminals
Faulty alternator
Wiring problems

In some cases, an engine that cranks but doesn’t start may be due to a mechanical problem. These problems can be more difficult to diagnose and repair.

Some common mechanical-related problems include:

Seized engine
Broken timing belt or chain
Faulty valves
Low compression

Troubleshooting Tips

If your engine is cranking but not starting, there are a few things you can do to troubleshoot the problem:

Check the fuel level and listen for the fuel pump when you turn on the ignition.
Inspect the spark plugs and ignition wires for damage or wear.
Clean the air filter and check for any vacuum leaks.
Test the battery and alternator to ensure they are working properly.
If you are not comfortable troubleshooting the problem yourself, take your car to a mechanic for diagnosis and repair.

Conclusion

If your car’s engine is cranking but not starting, there are a number of possible causes. By following the troubleshooting tips above, you can narrow down the problem and get your car back on the road.