Hey all. I have been having a problem with my truck lately that has become an annoying problem. I have a 1998 4.6L with true dual exhaust and an Air Force One intake. Truck works good except sometimes it starts rough and hesitates a little then runs fine. I also keep getting rich and lean codes for both banks so I am wondering if its my O2 sensors. Please help...

 

Whats the DTC #?

 

P0171 System Too Lean (Bank 1)
P0172 System Too Rich (Bank 1)
P0174 System Too Lean (Bank 2)
P0175 System Too Rich (Bank 2)

They don't follow any particular order or time frame they just keep showing up from time to time. Mostly lean codes though.

 

The Air Force intake could be your problem. A custom to should solve it. Do a search on AF1 intake.

 

I don't think its the AF1 intake. I can't be certain because I put that engine in after the intake was installed. My old engine (Ford or Volcan rebuild) blew up at about 52k and warranty ran out at 42k I think so this other 4.6L has about 111K. When I put that engine in I installed that intake at the same time. I will try to swap AF1 intake to stock one again but I am not to sure that will work. What symptoms tell you your Oxy sensors are bad?? If it makes a difference I do have a true dual exhaust with both cats and resonators cut but I did that with the old engine and never had any of those codes. Please help!!!