p0171 and p0174 codes - Ranger-Forums - The Ultimate Ford Ranger Resource


4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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Old 08-05-2012
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p0171 and p0174 codes

i have an 07 sohc and the cel will not go away i keep getting the lean condition bank 1 and 2 codes and cant get it to stay off ive changed the fuel filter,pump plugs are new intake gaskets are changed and the 90 degree hose on the pcv isnt cracked or broken and i cant find any vacum leaks anywhere ive tried propane with a long hose starting fluid and brakleen the truck runs fine but im sick of the light always coming on any help would be awesome
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Old 08-05-2012
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Do you have a K&N or a cold air kit? It is probably your mass air senser the baro reading is probably wrong. K&N oil can ruin them. If you know someone that has a scan tool that can read pids baro should be around 155 depending on your elevation. when they get to reading lower they will lean you out.
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Old 08-05-2012
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There is an air line that is prone to cracking. It runs along side of the passenger side of the engine and connects to the intake right after the throttle body. It cracks right at a 90 degree bend at the front of the motor. Mine cracked on the bottom and took a while to find, so keep a sharp eye.
I have a k&n as well and have not had any issues with my maf
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Old 08-05-2012
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what airline the one the pcv from the intake to the valve cover
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Old 08-05-2012
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and yes i do have a cold air kit but it is an afe oilless filter the truck has 160000 kms on it
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Old 08-12-2012
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Its a vacuum elbow. Rubber 90 degree elbow that runs with a plastic tube from below the throttle cover/throttle body area over to the drivers side valve cover. The little rubber elbow gets dry, cracks and leaks air & vacuum causing those codes. I replaced mine last year with a whole new assembly.
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