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Old 07-31-2005, 10:43 AM   #1 (permalink)
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I have an 02 Taurus 3.0L, car intermittently stalls and boggs down. Car will restart and I must feather the gas to keep it going. Code p0191 popped up along with codes related to running rich. I know p0191 is for the fuel rail pressure sensor. A technician has checked it and believes I need the pressure regulator replaced because the vehicle is showing 60 lbs of fuel pressure. I am concerned as to whether or not the fuel rail sensor could cause these symptoms or if another problem exists and the sensor is simply letting us know. I don't want to throw parts at it. The fuel filter is not very old. Thanks, in advance
ps. I don't think this car actually has a fuel regulator, rather a sensor
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Old 07-31-2005, 11:36 AM   #2 (permalink)
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DD12 DTC P0191: CHECK FUEL PRESSURE
Diagnostic Trouble Code (DTC) P0191 indicates the FRP sensor signal has exceeded the Self-Test Calibration limits and can only be retrieved during KOEO and KOER Self-Test. DTC P0191 (FRP) circuit fault low limit is 1.7 volts at 551 kPa (80 psi) and 3.8 volts at 930 kPa (135 psi) for the high limit.

Possible causes:

High pressure.
Low fuel pressure.
Damaged FRP sensor.
Excessive resistance.
Low or no fuel.
Key on.
Verify there is sufficient fuel (1/8 tank or greater).
Key off.
Fuel pressure gauge connected to Schrader valve.
Key on.
Is the pressure reading between 551 kPa (80 psi) and 930 kPa (135 psi)?
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Old 07-31-2005, 12:13 PM   #3 (permalink)
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key on engine off - the pressure is around 35psi
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Old 07-31-2005, 02:09 PM   #4 (permalink)
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I had a simular problem a long time ago and they found it had a bad O2 censor, or at least that is what they said. They replaced it, removed my SuperChip(Blamed the chip for the problem), reflashed the CPU and no more problem. That was about 60, 000 mile ago. I just turned 100K on my '02 and it is still running great.
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Old 08-01-2005, 10:08 PM   #5 (permalink)
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Quote:
Originally posted by ted75@Jul 31 2005, 12:13 PM
key on engine off - the pressure is around 35psi


So it's supposed to be between 80 and 135, and it's 35psi?

That strikes me as frightening.
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Old 08-01-2005, 10:29 PM   #6 (permalink)
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That seems very high. Haynes says that for 2001 models, pressure is supposed to be 45-56 psi at the Schrader valve with engine off. Okay, Haynes, and different year, but still...
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Old 08-02-2005, 05:46 AM   #7 (permalink)
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The Ford manual for '01 specs 35-65 psi. What is the pressure when the vacuum hose to the fuel pressure regulator is off and the engine running?
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Old 03-02-2011, 07:23 PM   #8 (permalink)
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yes, i know this is a old thread, a freind has a 2003 sable with this trouble code, it will start but has no power, acts like a fuel problem to me, when i changed the fuel filter under the car, i turned the key on and looked under the car expecting to see fuel running out, there was none. it wouldnt start for me then but is running now, just not well once you pull out onto the road and hit the gas. ive seen no schader valve to take a pressure reading, where did they hide it? and where is this sensor that "might" be bad? i think her payments to autozone are more than the car payments lately.
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Old 03-02-2011, 07:39 PM   #9 (permalink)
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Not sure on an 03, but on gen3 tecs, the test port (schrader valve) is on the pass. front side of the rail and the fpr (fuel press. reg.) is on the driver front side of the rail. The 03 will have a fuel pressure sensor with an elec. conn.
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Old 03-02-2011, 07:42 PM   #10 (permalink)
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thank you, the autozone desk help is not much help!
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