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Need help o2 sensor

bigred4x4

Off-road enthusiast
Elite Explorer
Joined
October 6, 2008
Messages
755
Reaction score
77
Location
Va
City, State
chesapeake virginia
Year, Model & Trim Level
'96 xlt 4x4
Ok so I start up the truck runs fine o2 sensors switching like normal then after warm up and a short drive the o2 sensors stick around .8 volts and idle is a little high and get a lean and sometimes rich bank 1&2 code from time to time just rebuilt engine with new plugs wires gaskets checked for vacuum leaks checked fuel pressure and injector leak down just replaced maf and tps and ect sensor ....... what am I missing? Next I'll try o2 sensors and iac valve other then that I'm stumped
 




bigred4x4

Off-road enthusiast
Elite Explorer
Joined
October 6, 2008
Messages
755
Reaction score
77
Location
Va
City, State
chesapeake virginia
Year, Model & Trim Level
'96 xlt 4x4
Also another thing sometimes I have to wiggle the fuel pump relay to start it otherwise fuel pump won't come on when you turn the key have already replaced relay no change
 




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