apprentice guy
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Freshman User
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apprentice guy
Hey guys.am new here to this forum.have a 05 f350 v10.truck started shutting off.at ambient temp of 40 degress.turned it back on gave me a po191.have not check fuel psi.order gauge.replaced fuel filter,fuel pump module.runs also cleaned maf.but today at 40 degree in the morning.starts fine.warmed her up put it drive.stumbled and turned off.had a hard time restarting.once on.i reved it to 3500 rpm.then the idle went low and off she goes.any help will be appreciated.
Senior User
Joined: Feb 2011
Posts: 421
Likes: 2
From: FT. Rucker AL
Possible causes
- High fuel pressure
- Low fuel pressure
- Damaged FRP sensor
- Excessive resistance in the circuit
- Low or no fuel
- Wiring harness connector of the fuel pressure sensor
- Fuel Rail Pressure Sensor
- Fuel
- Vacuum leaks
Read more: OBD2 - OBDII Code P0191 FORD - Fuel Rail Pressure Sensor Circuit Range/Performance | Engine-Codes.com
P0191 FORD Description
The Fuel Rail Pressure (FRP) sensor is a diaphragm strain gauge device in which resistance changes with pressure. The electrical resistance of a strain gauge increases as pressure increases, and the resistance decreases as the pressure decreases. The varying resistance affects the voltage drop across the sensor terminals and provides electrical signal to the Powertrain Control Module (PCM) corresponding to pressure.
Strain gauge type sensors are consider passive sensors. A passive sensor is connected to a voltage divider network so that varying the resistance of the passive sensor causes a variation in total current flow.
Voltage that is dropped across a fixed resistor in series with the sensor resistor determines the voltage signal at the PCM. This voltage signal is equal to the reference voltage minus the voltage drop across the fixed resistor.
The FRP sensor measures the pressure of the fuel near the fuel injectors. This signal is used by the PCM to adjust the fuel injector pulse width and meter fuel to each combustion cylinder.
Read more: OBD2 - OBDII Code P0191 FORD - Fuel Rail Pressure Sensor Circuit Range/Performance | Engine-Codes.com
Hope this helps.
- High fuel pressure
- Low fuel pressure
- Damaged FRP sensor
- Excessive resistance in the circuit
- Low or no fuel
- Wiring harness connector of the fuel pressure sensor
- Fuel Rail Pressure Sensor
- Fuel
- Vacuum leaks
Read more: OBD2 - OBDII Code P0191 FORD - Fuel Rail Pressure Sensor Circuit Range/Performance | Engine-Codes.com
P0191 FORD Description
The Fuel Rail Pressure (FRP) sensor is a diaphragm strain gauge device in which resistance changes with pressure. The electrical resistance of a strain gauge increases as pressure increases, and the resistance decreases as the pressure decreases. The varying resistance affects the voltage drop across the sensor terminals and provides electrical signal to the Powertrain Control Module (PCM) corresponding to pressure.
Strain gauge type sensors are consider passive sensors. A passive sensor is connected to a voltage divider network so that varying the resistance of the passive sensor causes a variation in total current flow.
Voltage that is dropped across a fixed resistor in series with the sensor resistor determines the voltage signal at the PCM. This voltage signal is equal to the reference voltage minus the voltage drop across the fixed resistor.
The FRP sensor measures the pressure of the fuel near the fuel injectors. This signal is used by the PCM to adjust the fuel injector pulse width and meter fuel to each combustion cylinder.
Read more: OBD2 - OBDII Code P0191 FORD - Fuel Rail Pressure Sensor Circuit Range/Performance | Engine-Codes.com
Hope this helps.
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Freshman User
Joined: Dec 2012
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05 f350 stalling in cold weather.
Cool thanks.ill just ordered my fuel psi tester with the autometer#3280 fuel rail adapter.i scaned it.and thats what is showed the fuel rail sensor.will check fuel psi and give results back.should ne here jan 4.
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Senior User
Joined: Feb 2011
Posts: 421
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From: FT. Rucker AL
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05 f350 stalling in cold weather.
Laughing Gas
Joined: May 2008
Posts: 939
Likes: 1
From: Central Kansas
Where are you planning on testing the fuel pressure? Not sure, is that adapter supposed to thread into the fuel rail somewhere? There's not a schrader valve on the 3v motors. You need a scanner capable of reading it electronically.
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firemarshalmike
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Jan 19, 2014 09:25 PM