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O2 sensors

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Old Nov 17, 2013 | 02:12 PM
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O2 sensors
after replacing the O2 sensors (all four.My 2001 Expedition 5.4l keeps idling high then low and stalls. the only codes that come up are the bank 1 and bank 2 sensors for the O2. any ideas?
 
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Old Nov 17, 2013 | 03:28 PM
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Whar are the specific codes?
 
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Old Nov 17, 2013 | 04:31 PM
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O2 sensors do NOT cause "lean" codes, they're simple the messenger.

You most likely have a severe vacuum leak.
 
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Old Nov 17, 2013 | 04:41 PM
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The codes are P0171 and P0174. if it's a vacuum leak where would i start looking
 
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Old Nov 17, 2013 | 05:52 PM
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The infamouse leaking PCV elbow at the back of the intake manifold?
 
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Old Nov 18, 2013 | 10:52 AM
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Originally Posted by pdqford
The infamous leaking PCV elbow
Leaking, broken, cracked, crushed, snapped...that's a lot of responsibility for one little elbow.
 
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Old Nov 18, 2013 | 12:52 PM
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Originally Posted by alloro
Leaking, broken, cracked, crushed, snapped...that's a lot of responsibility for one little elbow.
That's why I try to limit my elbow's responsibility to 12 ounces during the week.

Weekends, more...
 
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Old Nov 18, 2013 | 02:06 PM
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Originally Posted by projectSHO89
Weekends, more...
That's why God gave us 2 elbows. Use the second one on the weekend so you can rest the first one.
 
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Old Nov 18, 2013 | 05:49 PM
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: !!!
 
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Old Nov 19, 2013 | 04:35 AM
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PCV hose it was. Thanks. g
 
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