Lean Condition
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Posting Guru
Joined: Mar 2007
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Lean Condition
06 5.4 in a Super Duty....
The engine runs fine. on my way home from work... cruising at 45 mph my yellow check engine light came on....
I ran up to the parts store I am runnin lean on both banks the code reader says
PO 171 & PO 174
Any ideas ? I will start lookin for vacuum leaks tomorrow eve after work.
The engine runs smooth, and has power. It acts no different. Exhaust smells normal.
The engine runs fine. on my way home from work... cruising at 45 mph my yellow check engine light came on....
I ran up to the parts store I am runnin lean on both banks the code reader says
PO 171 & PO 174
Any ideas ? I will start lookin for vacuum leaks tomorrow eve after work.
The engine runs smooth, and has power. It acts no different. Exhaust smells normal.
Freshman User
Joined: Feb 2014
Posts: 29
Likes: 0
06 5.4 in a Super Duty....
The engine runs fine. on my way home from work... cruising at 45 mph my yellow check engine light came on....
I ran up to the parts store I am runnin lean on both banks the code reader says
PO 171 & PO 174
Any ideas ? I will start lookin for vacuum leaks tomorrow eve after work.
The engine runs smooth, and has power. It acts no different. Exhaust smells normal.
The engine runs fine. on my way home from work... cruising at 45 mph my yellow check engine light came on....
I ran up to the parts store I am runnin lean on both banks the code reader says
PO 171 & PO 174
Any ideas ? I will start lookin for vacuum leaks tomorrow eve after work.
The engine runs smooth, and has power. It acts no different. Exhaust smells normal.
Mountain Pass
Joined: May 2011
Posts: 222
Likes: 11
From: Strasburg,CO
I'm having the same issue. I have replaced MAF sensor throttle body motor and throttle body gasket the vacuum lines from the break booster to the other side of engine compartment, the vacuum line elbow at the back of the motor the the f150 ' s were recalled for. (I have an 06 F250 5.4 too) the only thing I can think of is to replace the intake manifold gaskets. Have not found any vacuum leaks other than the elbow in back of the motor.
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Posting Guru
Joined: Mar 2007
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Mine was simply a dirty MAF.
Make sure you reset the computer or your check engine light and codes will remain.
I disconnect the battery, then connect the pos and neg cables together for 20 min, then separate and reconnect them to the battery. This wil reset to factory settings. I then drove to and from work, 25 miles each way gives the computer time to complete atleast 1 cycle.
Make sure you reset the computer or your check engine light and codes will remain.
I disconnect the battery, then connect the pos and neg cables together for 20 min, then separate and reconnect them to the battery. This wil reset to factory settings. I then drove to and from work, 25 miles each way gives the computer time to complete atleast 1 cycle.
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