Random P0193 2006 Taurus Vulcan - Taurus Car Club of America : Ford Taurus Forum
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post #1 of 11 (permalink) Old 07-14-2019, 06:33 PM Thread Starter
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Random P0193 2006 Taurus Vulcan

Hoping I can get some guidance on this one. I keep getting a P0193 Fuel Rail Pressure sensor A circuit High CEL every few weeks. Occasionally it will be accompanied by a P2198 O2 Bank 2 Sensor stuck rich. The code only throws on start up and when it does motor stumbles and loss of power (even may stall) when restarted it goes right back to normal. Ive changed the FRPS now and the code returns. Found a small vacuum leak on the FRPS where it enters the intake manifold and sealed that. Currently the car has 144K miles on it. New fuel pump and filter were put on it in Febuary by my mechanic when it went out ( I was leaving on a business trip the next day so had them do it) they used NAPA parts. I had a little rough idle a month so ago, so gave it new plug's (NGK iridium gap .044") new wires (motorcraft), New PVC valve (motorcraft), new Cam sensor and synchro (it was chirping awhile back, motorcraft parts for both), and new IRMC gasket (motorcraft). After the CEL comes on and car restarts fuel pressure is at 60psi with ignition on, and runs from mid 40's to low 50's driving around with different loads. If I really jump on it it will drop to high 30's but bounce right back to mid 40's after a second or two. Idles right at 700rpm and doesn't lope or stutter. Fuel mileage goes bad and then seems to return to normal. Freeze Frame data for the P0193 is:
Load PCT% - 40
ShrtFT1 - -7.0
LongFT1- -3.9
ShrtFT2- -6.3
LongFT2- -1.6
RPM - 869
Spark Adv - 8
MAF - 1,130
O2B1S1 - .940
O2B1S2- .078
O2B2S1 - .825
O2B2S2- .105
FRP - 78.2 Psi
FLI%- 43.9
CateMP11 Fdeg - 953.42
CateMp21 Fdeg - 953.42

Any advice where I should look next is appreciated.

-Larry
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post #2 of 11 (permalink) Old 07-14-2019, 07:13 PM
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Quote:
Originally Posted by Pennywise67 View Post
Hoping I can get some guidance on this one. I keep getting a P0193 Fuel Rail Pressure sensor A circuit High CEL every few weeks. Occasionally it will be accompanied by a P2198 O2 Bank 2 Sensor stuck rich. The code only throws on start up and when it does motor stumbles and loss of power (even may stall) when restarted it goes right back to normal. Ive changed the FRPS now and the code returns. Found a small vacuum leak on the FRPS where it enters the intake manifold and sealed that. Currently the car has 144K miles on it. New fuel pump and filter were put on it in Febuary by my mechanic when it went out ( I was leaving on a business trip the next day so had them do it) they used NAPA parts. I had a little rough idle a month so ago, so gave it new plug's (NGK iridium gap .044") new wires (motorcraft), New PVC valve (motorcraft), new Cam sensor and synchro (it was chirping awhile back, motorcraft parts for both), and new IRMC gasket (motorcraft). After the CEL comes on and car restarts fuel pressure is at 60psi with ignition on, and runs from mid 40's to low 50's driving around with different loads. If I really jump on it it will drop to high 30's but bounce right back to mid 40's after a second or two. Idles right at 700rpm and doesn't lope or stutter. Fuel mileage goes bad and then seems to return to normal. Freeze Frame data for the P0193 is:
Load PCT% - 40
ShrtFT1 - -7.0
LongFT1- -3.9
ShrtFT2- -6.3
LongFT2- -1.6
RPM - 869
Spark Adv - 8
MAF - 1,130
O2B1S1 - .940
O2B1S2- .078
O2B2S1 - .825
O2B2S2- .105
FRP - 78.2 Psi
FLI%- 43.9
CateMP11 Fdeg - 953.42
CateMp21 Fdeg - 953.42

Any advice where I should look next is appreciated.

-Larry
Fuel pressure too high. If the FPDM does not regulate the pump "effective volts" the pump runs full tilt and the pressure bypass in the pump will bypass the fuel to protect the pump. Nominal pressure relief is 80#. Since you get a pressure reading from the OBDII the sensor must be working but the FPDM is not. Regulated pressure by the FPDM ~38-44#.

See diagram, note, the + is battery volts, and the - is adjusted by the system.
-chart-
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Last edited by chartmaker; 07-14-2019 at 07:19 PM.
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post #3 of 11 (permalink) Old 07-15-2019, 06:43 AM Thread Starter
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Join Date: Apr 2019
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Thanks Chartmaker, I didnt even consider the FPDM as an issue. I will order a new FPDM and pull the back seat and check the connections. Thank you!

Larry
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post #4 of 11 (permalink) Old 07-19-2019, 07:03 PM Thread Starter
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Quote:
Originally Posted by chartmaker View Post
Fuel pressure too high. If the FPDM does not regulate the pump "effective volts" the pump runs full tilt and the pressure bypass in the pump will bypass the fuel to protect the pump. Nominal pressure relief is 80#. Since you get a pressure reading from the OBDII the sensor must be working but the FPDM is not. Regulated pressure by the FPDM ~38-44#.

See diagram, note, the + is battery volts, and the - is adjusted by the system.
-chart-
Replaced the FPDM and the codes returned shortly. 78psi spike on startup and 52-55psi during idle. Any suggestions on what to check next? could this be injector related?

Larry
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post #5 of 11 (permalink) Old 07-19-2019, 08:51 PM
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Was the fuel pump a universal pump that was installed on the old pump module or was the hold assembly replaced? Also the vacuum hose connection to the manifold could be blocked with crud.
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post #6 of 11 (permalink) Old 07-20-2019, 07:26 AM
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Also possible the FPTS itself is bad. I would head to the JY and grab 1 or 2 and try them.
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post #7 of 11 (permalink) Old 07-20-2019, 07:39 AM Thread Starter
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I assumed they replaced the whole unit. I didn’t ask since I was rushing back out for a work emergency, but I will dig out the receipt and check. Which vacuum line you referring to? The one that comes off the fuel rail pressure sensor and runs to the intake?

Jeff K, are you referring to the fuel rail pressure sensor? I have tried 2 brand new ones, different brands one from rock auto and one from Napa.

One note while I had the back seat out replacing the module, I could hear a faint sucking sound while car was running that would stop if I unplugged the module.
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post #8 of 11 (permalink) Old 07-20-2019, 09:38 AM
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Try to clean out the fitting on the intake manifold that the vacuum hose connects to. Disconnecting the connector on the module stops the pump which makes a whining noise.
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post #9 of 11 (permalink) Old 07-21-2019, 05:04 PM Thread Starter
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I checked all the vacuum lines from the fuel pressure sensor to the intake manifold. All were clear and pulling a vacuum. Made sure the PVC valve hose was clear also. Rechecked for any vacuum leaks or loose connections. Car is idling a little rough with a slight stumble now. When I turned it on this afternoon after checking everything fuel pressure was running in the high 30’s psi then after idling awhile jumped up to the mid 50’s. Since there is no return line could a clogged canister purge valve cause high fuel pressure?

Also what part is the FPTS that JeffK was referring to? Thanks for the help.

Larry
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post #10 of 11 (permalink) Old 07-21-2019, 09:02 PM
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If the car's idle is rough then you may have a vacuum leak. Check long term fuel trims.
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