Empty, or very low fuel tank.

Add some new gas to the tank. Sometimes the fuel gauge doesn't

work correctly to show the actual fuel level.

Fuel is not being delivered correctly.

Monitor constant fuel pressure at the fuel rail. Monitor the injector signal at each cylinder. Also, ensure cylinders are not getting flooded.

There may be vacuum air leaks in the system.

Make sure that all hoses on the air intake system are securely

attached. You can also perform a smoke test to detect any air leaks.

The airflow or air mass meter is not working correctly.

Try disconnecting the air meter to see if the car is able to stay

running without them. This might may indicate you could have

a bad air meter. Also, extremely dirty air meters should be replaced

The Crankshaft Reference Sensor is not working properly.

With a Multimeter test the Crankshaft Reference Sensor (See our YouTube video). Also, sometimes in modern cars, you can use your scan tool to see if your ECU is detecting an RPM signal.


No compression in the cylinders or the engine.

Perform a compression check on all the cylinders.

Engine or Distributor timing is off.

Ensure that the timing is correctly set



Some of the testing procedures described in this guide could be dangerous if done improperly. We recommend that they are performed by an ASE certified mechanic




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