Question about 2004 Chevrolet Avalanche

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The Check engine Light Comes On After Installing A Throttle body spacer and A K+n Filter, (Which We Had On Our ) '04 Suburban 5,3 Liter 295 Hp Vortec. the codes Are ''0171, 0174''. We Had It Installed By A Real Inspection Mech. I Saw Them 1st disconnecteed the neg battery term, and then Disconnect the Air Sensors. Now It Didn't Come right on Right Away, But A Few Hors Later, Took It Back, And Those Were The Codes, And He erased Them? And It The Chek Engine Light Came Back On??? Thanks For Any Advice. I Also Did Buy a Superchips Computer, But Haven't Used It At All, To Scared To Do it BY Myself, And The Mechanic That Instaklled the Parts Won't Use The Superchips Either, But That Might B Needed ?? To Adjust These Codes????BUt I Don't Know And Aren't Asamed To Admit It... Thank To Whoever Helps Us Out !!! James Woodf

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  • james_maribe Mar 03, 2009

    This Is James Again With The )4 Avalanche,

    The Codes " Mean Too Rich" And "system Too Lean" Thank You !!! James

  • james_maribe Mar 04, 2009

    Thank You "

    keeperoffire" I Appreciate That, I Put A New Mass Air-Flow Sensor On, And The Check Engine Light Still Came on as Too Rich.... And I Had The Comp Re-set Again, Now I Did Fail To Mention That I also Have a Remote Start... Which Since this Installation, Has been Giving Us problems as well. Thanks Again For Your And Any Further Suggestions !!! Take It Easy !!! James

  • james_maribe Mar 05, 2009

    You'll Never Beleive That It Was The KenWood Deck I Have Installed Instead Of Factory, This deck Didn't Let the On-Star Loop To Complete, Because Of The Deck. No One Wasn't prepared For Hearing That 's All That Was Needed To Correct The Problem, The Installer Had To Unplug A Few Fuses, Then The Computer Was Programmable To Accept the New Bolt -On Performance Parts.... So At Least There's The Legitimate Fix To he Problem In Case Anyone Else Runs Into It. Thanks Again For Your Time,


  • james_maribe Mar 06, 2009

    Well Thank You..... Yeah That Is Def A Messed Up Backwards Way Of Finding Out A Diagnosis... But Yeah Much Releived !!! , It Wasn't Able To read The Codes Properly B-Cause The Aftermarket Deck Interrupted The Loop From On-Star.... And After The Installer Got On THe Phone W"Superchips." , They Told Him To Pull The Radio In-line Fuse From Batt, Then Pull A Few More Fusses From The Fuse Box Under The Hood Behind Battery, And Then All The Suddon, Successs !!!! Yeay....Well Now You Have A New Way To Suggest A Fix In Case Anyone Else Goes Thru This Stuf..... Thanks Again, James W.



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Both a po171 and a po174 are lean codes.Not to say that this is for sure your problem but i have seen several times with the K&N systems where to much oil has been put on the filter and it contaminates the mass air flow sensor.something to try or check.

Posted on Mar 03, 2009

  • Mark Nichols
    Mark Nichols Mar 05, 2009

    I am going to save this e mail and do some checkin and get back to you.Thanks for the feedback.

  • Mark Nichols
    Mark Nichols Mar 06, 2009

    Your welcome.I would of never sent you in that direction,Im glad you got it figured out.I spoke with a couple peaple today and neither of them had sujestions remotely close to that.I will defanately keep that one in the books.thanks for the response.



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