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Ford Truck Club Forum > FORD F-100 | F-150 SERIES > 1992-1996 Ford F150



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  #1  
Old May 4th, 2013, 11:23 PM
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Default Codes

Twisted was driving the truck today and told me that the CEL had intermittently come on. So I ran a KOEO test and this is what popped up.

121 closed throttle TPS voltage high or low
Ok, I may need a new TPS.

172 Engine lean right bank (p/s) I have one O2 sensor so how can it tell one bank from another?

327 DPFE or PFE circuit voltage below .02 volts

Can't help but wonder if 327 is related to the 172. Not sure. I've had problems with the DPFE code before back when I went to Texas last November. Back then I replaced the EGR valve and the EVR sensor on top but not the DPFE. IIRC, its the vac solenoid on the d/s bank of the engine, right?

Any suggestions?



1994 F150 XLT ExCab SB 306, 4R70w, 8.8 3.55 open, MSD StreetFire coil, Taylor Siro Pro wires, MSD cap and rotor, 1.72 Roller Rockers, 2º cam advance w/ Cloyes Street True Roller timing set, Flat top Hyperutectic pistons, Flowtech Long Tube headers, Xpipe, High flow Magnaflow converters, Spintech XL Sportsman DIDO muffler.

  #2  
Old May 5th, 2013, 09:16 AM
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I think 172 is because you have only 1 O2 sensor.
  #3  
Old May 5th, 2013, 10:16 AM
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http://www.troublecodes.net/Ford/

(R) = Engine Running test (M) = Memory code (O)=Key On Engine Off test

172
(R,M)
Oxygen sensor not switching - system is or was lean - Single, Right or Rear HO2S - Fuel control

121
(O,R,M)
Throttle Position (TP) sensor out of range - TPS

327
(O,R,M)
EGR feedback signal is/was low - EVR or PFE

2003 F-150 XL RCSB 2wd 4.2 5 speed 3.55 LS
  #4  
Old May 5th, 2013, 10:43 AM
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Quote:
Originally Posted by BigBlue79 View Post
I think 172 is because you have only 1 O2 sensor.
Maybe, but that really doesn't make sense to me. With the factory exhaust the O2 was in a little cross over tube just before the Y in the pipe. Now it is plumbed into the P/S header collector. The codes states that it is a lean condition for the P/S of the engine. How does it differentiate the exhaust gasses from one side of the engine to the other when the exhaust was stock, Especially now that it has no idea what the D/S of the engine is doing? Is the EEC capable of some sort of pulse timing the exhaust flow in measuring O2 in the exhaust from bank to bank? If that's the case I need to replumb the O2 sensor in the X pipe.
There must be another way the EEC is calculating this or the code explanation from oldfuelinjection is inaccurate. Right now I think that I have to assume the whole system is lean, or at least when the CEL pops up. I going to run a KOER and CBST later today and see what I get. I didn't last night due to the noise of it all and it being late.



1994 F150 XLT ExCab SB 306, 4R70w, 8.8 3.55 open, MSD StreetFire coil, Taylor Siro Pro wires, MSD cap and rotor, 1.72 Roller Rockers, 2º cam advance w/ Cloyes Street True Roller timing set, Flat top Hyperutectic pistons, Flowtech Long Tube headers, Xpipe, High flow Magnaflow converters, Spintech XL Sportsman DIDO muffler.

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Old May 5th, 2013, 09:18 PM
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I've cleared the codes and will see if they return. If not ill rerun a full string of tests next weekend. As of right now nothing is showing but system pass.



1994 F150 XLT ExCab SB 306, 4R70w, 8.8 3.55 open, MSD StreetFire coil, Taylor Siro Pro wires, MSD cap and rotor, 1.72 Roller Rockers, 2º cam advance w/ Cloyes Street True Roller timing set, Flat top Hyperutectic pistons, Flowtech Long Tube headers, Xpipe, High flow Magnaflow converters, Spintech XL Sportsman DIDO muffler.

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Old May 5th, 2013, 09:20 PM
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IIRC on my 88, which retained Factory Emissions, my O2 sensor was screwed into a bung that was welded in between the Forks of the Y so both sides were read.
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Old May 5th, 2013, 09:35 PM
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Yup that's how the 94 was setup stock. The question is, as far as the O2 and the 171 code is concerned, how does a single O2 differentiate the difference between one bank and the other? I think there's no way and glc's description of the code makes more sense. 1 O2 means the entire engine was lean at one time. The only thing I'm concerned with now is the TPS and DPFE codes. I should see something next weekend as I will have a little bit of traveling again next weekend. About 300 miles worth. If there's a problem it will likely rear its ugly head. I've got roadside so no worries.

Afterthought: I'm kind of wondering if I have a bad ground somewhere. Hmmmmm



1994 F150 XLT ExCab SB 306, 4R70w, 8.8 3.55 open, MSD StreetFire coil, Taylor Siro Pro wires, MSD cap and rotor, 1.72 Roller Rockers, 2º cam advance w/ Cloyes Street True Roller timing set, Flat top Hyperutectic pistons, Flowtech Long Tube headers, Xpipe, High flow Magnaflow converters, Spintech XL Sportsman DIDO muffler.

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Old May 6th, 2013, 02:06 AM
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Where you have your sensor plumbed in, you really are only measuring one side. The EEC of course thinks it's a single.

2003 F-150 XL RCSB 2wd 4.2 5 speed 3.55 LS
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Old May 6th, 2013, 02:14 PM
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I understand that but wouldn't it still measure the o2/exhaust levels the same as if it we're stock? I mean, its kinda obvious, to me anyway, that with a single O2 sensor stock that it would in no way be able to determine a lean condition from one bank to the other. The entire engine would have to of been lean at one instance.



1994 F150 XLT ExCab SB 306, 4R70w, 8.8 3.55 open, MSD StreetFire coil, Taylor Siro Pro wires, MSD cap and rotor, 1.72 Roller Rockers, 2º cam advance w/ Cloyes Street True Roller timing set, Flat top Hyperutectic pistons, Flowtech Long Tube headers, Xpipe, High flow Magnaflow converters, Spintech XL Sportsman DIDO muffler.

  #10  
Old May 6th, 2013, 02:49 PM
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Idk, I could be wrong.



1994 F150 XLT ExCab SB 306, 4R70w, 8.8 3.55 open, MSD StreetFire coil, Taylor Siro Pro wires, MSD cap and rotor, 1.72 Roller Rockers, 2º cam advance w/ Cloyes Street True Roller timing set, Flat top Hyperutectic pistons, Flowtech Long Tube headers, Xpipe, High flow Magnaflow converters, Spintech XL Sportsman DIDO muffler.



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