Fuel injectors not closing

Good evening,

If the injectors are not closing and flooding the engine, it may be the PCM as that is what controls the injector commands.

If you remove the wires from the injectors, does it still spray fuel into the cylinders?

If it does, the injectors are bad.

If it does not then the PCM may be the failure.

The code for the sensor may mean it sees lower pressure from the excessive fuel flow.

Roy

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

P0191
Descriptor
Fuel Rail Pressure Sensor Circuit Performance (Frp)
Probable Causes
Circuit Resistance Excessive
Fuel Rail Pressure (FRP) Sensor Damaged
High Fuel Pressure
Low Fuel Pressure
Low or No Fuel

Welcome back and thanks for starting a new thread.

The code you gave me can indicate a couple things. When you say the injectors are not closing, is the engine flooding? The code indicates an issue with the fuel rail pressure sensor. I have attached a picture to show you the possible things that could set the code.

The first thing you need to do is check fuel pressure. If it is too low or too high, that will set the code. Here is a link that shows how to check pressure:

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

The pressure you should find is between 35 and 70 psi. That seems like an exceptionally large range, but that is what the manual says.

Check this first and let me know what you find.

Take care,
Joe

Adrianne:

It could be the PCM, but if it is flooding, that tells me the pressure is most likely too high and the regulator is not doing its job.

Let us know what you find.

Joe

Welcome back:

The pressure looks good. Which leads me to question the sensor or a wiring issue, or the PCM. Interestingly, the injectors should not open/leak with that pressure unless actuated. So, if they are sticking open all the time, as Roy said, I question the PCM or an injector. However, if all are leaking, it would be hard to believe they all went bad at once.

Let us know.

Take care,
Joe