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2003 Lincoln Navigator Question: my 2003 aviator i coded it out with a OBD and po171 and po174 came up

 

Question

bigblock44, Jenison, MI, November 29, 2012, 06:35
 Rookie

this is lean cylinders left bank and leaan cylinders right bank. What would cause this?

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  • Answer #1

    Greg's Orange Auto (13943 Answers) , Orange, CA - (714) 361-9386
    globalhelper November 29, 2012, 06:52
     Master

    look for vac leak. poss pcv hose is bad and causing leak. fords are good for this. it could also be serveral other items like mass air flow or injectors issue. if you can't find a vac leak have a smoke test done on car and that will show you any leaks. but pull pcv hose and insp that 1st. DO YOU HAVE HIGH IDLE?

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    bigblock44, November 29, 2012, 07:17
     Rookie

    no only when it first starts. only issue besides the check engine light on is a slight shake of the engine

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    globalhelper, November 29, 2012, 07:23
     Master

    i believe you have a vac leak causing the problem ck pcv hose 1st its very common

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    bigblock44, November 29, 2012, 08:15
     Rookie

    yes it was a collapsed elbow and there was a hole in it. You were spot on Thank You!

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    globalhelper, November 29, 2012, 12:46
     Master

    you are so welcome,its people like you that make my time on this site worth it

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