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1979-2004 V6 Mustang Tech Discussions

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Unread 01-05-2011   #1 (permalink)
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Unhappy 2000 Mustang dtc codes P0171/P0174 /P0455

Hello,

I just bought a 2000 Mustang convertible V6.
The service engine light is on so I did the dtc check. My obd11 Reader gave me the codes of P0171 Bank 1 P0174 Bank 2 too Lean and P0455 Evap System Leak detected (gross leak/no flow). The Freeze frame was on the P0174.

I am also new at the ob11 readers! Can someone help me as to where I go from here? I have read so many things as to clean the MAF, check the fuel lines, check the gas cap (which was the first thing I did) replace the Evap canister etc. Not sure what to do next. You guys really seem to know your stuff. Thanking you in advance.
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Unread 01-05-2011   #2 (permalink)
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Per the freeze frame data what was the ECT (coolant temp sensor) reading when the codes set?
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Unread 01-05-2011   #3 (permalink)
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I would look for a large vacuum leak in the line to the Canister Purge Solenoid. You need to find something that would cause both banks to be getting too much air or not enough fuel. Since you don't mention any driveability issues, I would assume that fuel delivery isn't the first area to check. I think excess air is the most likely cause. For the evaporative monitor to run, the PCM commands the canister vent solenoid to close, sealing the system and then commands the purge solenoid on to pull a vacuum on the vent side of the fuel system. It then monitors the fuel tank pressure to determine if there is a leak. The 455 code means that the computer didn't see any or very little pressure change in the fuel tank pressure. This is my rationale for closely checking for a vaccuum leak in the purge line, this should be a large vaccum hose that connects near the throttle body-runs to the purge control solenoid or valve and then runs back to the fuel tank. If it isn't obvious you might get a length of fuel line or something similar and hold one end to your ear and work along the line listening for a whistle. The other option is to take it to a shop and have them diagnose the problem. I would use my smoke machine to check for the leak, expensive machine but speeds things up alot.
Good Luck!!!!!
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Unread 01-06-2011   #4 (permalink)
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Quote:
Originally Posted by jrowledge View Post
I would look for a large vacuum leak in the line to the Canister Purge Solenoid. You need to find something that would cause both banks to be getting too much air or not enough fuel. Since you don't mention any driveability issues, I would assume that fuel delivery isn't the first area to check. I think excess air is the most likely cause. For the evaporative monitor to run, the PCM commands the canister vent solenoid to close, sealing the system and then commands the purge solenoid on to pull a vacuum on the vent side of the fuel system. It then monitors the fuel tank pressure to determine if there is a leak. The 455 code means that the computer didn't see any or very little pressure change in the fuel tank pressure. This is my rationale for closely checking for a vaccuum leak in the purge line, this should be a large vaccum hose that connects near the throttle body-runs to the purge control solenoid or valve and then runs back to the fuel tank. If it isn't obvious you might get a length of fuel line or something similar and hold one end to your ear and work along the line listening for a whistle. The other option is to take it to a shop and have them diagnose the problem. I would use my smoke machine to check for the leak, expensive machine but speeds things up alot.
Good Luck!!!!!
Good info.....

Or, start your car, and spray carb cleaner over all the vacuum lines to see if there is a leak.....
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Unread 01-06-2011   #5 (permalink)
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If looking for a common cause for ALL of the issues, focus on the EVAP purge line between the throttle body and vapor management valve in the right hand fender well. Look for a leak in this line. The fuel vapors are very hard on rubber parts which degrades the lines.
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Unread 01-06-2011   #6 (permalink)
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I would be very careful spraying carb cleaner, as it is flammable you can cause yourself issues(like a fire). This is only effective if you are watching o2 sensor waveforms or short term fuel trim. The computer is fast enough to compensate in idle air control to cover up any change the carb cleaner might make.
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Unread 01-13-2011   #7 (permalink)
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Quote:
Originally Posted by shinerstang View Post
Good info.....

Or, start your car, and spray carb cleaner over all the vacuum lines to see if there is a leak.....

Thanks but don't think I want to cause a fire

Last edited by cowgirlup4267; 01-13-2011 at 04:54 PM. Reason: posted on wrong answer
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Unread 01-13-2011   #8 (permalink)
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Thank you very much for the much needed detailed information. I will try this and see what I find
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Unread 01-13-2011   #9 (permalink)
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Quote:
Originally Posted by jrowledge View Post
I would look for a large vacuum leak in the line to the Canister Purge Solenoid. You need to find something that would cause both banks to be getting too much air or not enough fuel. Since you don't mention any driveability issues, I would assume that fuel delivery isn't the first area to check. I think excess air is the most likely cause. For the evaporative monitor to run, the PCM commands the canister vent solenoid to close, sealing the system and then commands the purge solenoid on to pull a vacuum on the vent side of the fuel system. It then monitors the fuel tank pressure to determine if there is a leak. The 455 code means that the computer didn't see any or very little pressure change in the fuel tank pressure. This is my rationale for closely checking for a vaccuum leak in the purge line, this should be a large vaccum hose that connects near the throttle body-runs to the purge control solenoid or valve and then runs back to the fuel tank. If it isn't obvious you might get a length of fuel line or something similar and hold one end to your ear and work along the line listening for a whistle. The other option is to take it to a shop and have them diagnose the problem. I would use my smoke machine to check for the leak, expensive machine but speeds things up alot.
Good Luck!!!!!


Very detailed information - Thank You so very much
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Unread 01-13-2011   #10 (permalink)
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Quote:
Originally Posted by cowgirlup4267 View Post
Thanks but don't think I want to cause a fire



Carb cleaner will not cause a fire. It is done as a normal process for finding vacuum leaks. This is not my first rodeo......
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