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OP
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What makes PO172 "system too rich, bank one" happen? 
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98 Contour SE Sport 2.5 Duratec ATX The wifey's car
89 Taurus SHO - 246K miles
94 SHO ATX - 190K
1997 F-150 5.4L ATX - The Workhorse 150K.
ANY THREAD WITH "OMG" or "WTF" ETC IN THE TITLE WILL BE IGNORED!
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I have a real time scanner but I don't have the manual to tell me how to use it.
I don't understand why I don't get rich on bank 2 also.
Can anybody tell me how to check the system in KOER mode.
I'm trying to avoid the expense of any unnecessary labor or manuals, ect. because I need to sale this car.
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What engine, year and mileage? What air filter are you using? Clean the MAF. What scanner is it? You might be able to download instructions or the manual.
Some reasons for P0172 from TSB.
P0172 - System Too Rich (Bank 1) The Adaptive Fuel Strategy continuously monitors fuel delivery hardware. The code sets when the adaptive fuel tables reach a lean calibrated limit.
Fuel System:
�· Excessive fuel pressure
�· Leaking/contaminated fuel injectors
�· Vapor recovery system concern
Base Engine:
�· Oil overfill
�· Cam timing concern
�· Low cylinder compression
�· Excessive engine wear
Powertrain Control System:
�· PCM concern
Induction System:
�· MAF contamination
"Always do the cheap and easy ones first."
1996 V6 ATX 96K miles
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2000 CSVT, 83,000 miles, paper air filter, Actron CP9145 scanner, and I have cleaned MAF.
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Last edited by Tony2005; 07/21/06 04:45 PM.
"Always do the cheap and easy ones first."
1996 V6 ATX 96K miles
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If you are getting a rich code set on only one bank, you need to look for something that can affect only one bank. Things to look at: - injectors for that bank. (though would probably lead to a misfire if they weren't operating properly.. note I said PROBABLY)
- spark plugs for that bank. Check gap, etc.
- faulty O2 sensor on that bank
Things NOT to check, or not LIKELY to cause the problem: - MAF, TB, etc (anything that is before the air-path splits in to seperate banks)
'99 CSVT - Silver #222/276
In a constant state of blow-off euphoria.
Originally posted by Kremitthefrog:
I like to wear dresses and use binoculars to watch grandmas across the street.
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I agree. I'm thinking it may be an injector leaking. I was having the 1/4 tank returnless fuel pump issue and had removed the pump several times in attemps to clean the sock filter and remove the disk screen, which didn't help, so I installed the fsvt pump. During these removals the fuel pressure has been very low. I'm not sure how low because my pressure gauge needs a new seal so I have not bothered with putting it on to check for leak down while the key is off. I remember changing the fuel filter a couple of years ago and the pressure was unbelievable. I thought it was never going to stop spraying! Is there a way I could use my scanner to determine if an injector is leaking? I already have the manual that Tony linked for me. (Thanks Tony) I believe there is also a manual that is more detailed for around $100 which I don't have just laying around, my kids beat me to it! I have replaced the lower bank one O2 sensor, still get PO172, so I switched it out with bank two's lower sensor, and I still get PO172.
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Originally posted by brett64:
..
I have replaced the lower bank one O2 sensor, still get PO172, so I switched it out with bank two's lower sensor, and I still get PO172.
P0172 has nothing to do with lower O2 sensors. Just plug in your scanner and drive the car for a while then download the info from the scanner. All the info on how to download the P/ID and freeze frame data is in the downloaded manual. Then post the data and more help will be coming. If you can't do that, then send it in for a one hour scan diagnostic and they will be able to tell you if you injectors are bad or whatever.
"Always do the cheap and easy ones first."
1996 V6 ATX 96K miles
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I replaced the bank 2 sensor because the shop that installed a new clutch, etc. pinched the wire and it was measuring 5.8 ohms. I figured that it was sending a low signal back to the PCM which was richening the fuel mixture then causing the PO172 code. So while I was under the car one day I decided to switch the two.
The freeze frame I have is:
RPM 2713
CALC Load % 12.2
Coolant temp. 183
LT FTRM 1 % -24.2
ST FTRM 1 % -6.3
LT FTRM 2 % -18.8
ST FTRM 2 % -7.0
Veh. speed 45
Fuel sys 1 CLSD
Fuel sys 2 N/A
I don't have a clue what all this means.
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