All four cylinders flood immediately with gas flooding the spark plugs preventing it from starting

WELDERMAN62

MEMBER
2005 NISSAN ALTIMA
2.5L
4 CYL
263,000 MILES

I have replaced everything fuel related; fuel pump, sensors, temperature control, air filter, new spark plugs, new coils and it still floods. I listen to the injectors with a screwdriver, and they are all ticking like it's supposed to be sounds like it's working fine. Do I need to replace the injectors or is it something else that is flooding the cylinders?

1 Reply

JACOBANDNICKOLAS

MECHANIC
109,747 POSTS

Hi,

Do you have a live data scan tool? If you do, check to see what the coolant temp sensor signal is to the PCM. If it is indicating extreme cold temperatures (for example -40F) the computer will cause the injectors to stay open longer to allow the engine to run in those conditions. If it is actually 70F, it will flood the engine.

However, if the plugs are getting wet immediately when the key is first turned on (without cranking), then we need to test fuel pressure to confirm it isn't too high and the injectors are good.

If you haven't checked the pressure, you should, it could have a faulty regulator. Here is a link that explains how it's done:

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Also, here is a link that explains how to test injectors:

https://www.2carpros.com/articles/how-to-test-a-fuel-injector

I have one other thought. Have you checked to make sure the plugs are getting spark? I ask because if they aren't burning the fuel, they certainly get wet. Here is a link that explains how to check.

https://www.2carpros.com/articles/how-to-check-for-ignition-spark

Let me know your thoughts and what has been done as far as these tests.

Take care,

Joe