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  1. #11
    Gong Shooter
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    On those you normally have to use your short term fuel trim on the scanner to see if it's the intake gasket, they go lean on one bank when they get the bad intake gasket, changed tons of them. I once had a problem on an 03 5.3 like that and it ended up being that they plugs in it had way too much gap. Though it was a turboed motor, but it's free to check.

  2. #12
    Paper Hunter
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    my 04 5.3 was doing similar stuff. Pull the 02 sensors and shake them, if they rattle, replace them. Fixed all my problems.
    ...An unarmed man can only flee from evil, and evil is not overcome by fleeing from it.
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  3. #13
    I am my own action figure
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    Quote Originally Posted by Martinjmpr View Post
    07 was the first year for the AFM (Active Fuel Management) system. This is the system that would deactivate 4 cylinders for better MPG. I have heard (on message boards) that the 07 and 08 5.3's, in particular, had problems relating to the AFM malfunctioning. Not sure exactly what the symptoms are (my 5.3 is an 04) but it may be something to check.
    Based on the common problems and what you have already eliminated...AFM would be my bet. Have had a few friends that this has happened to with the 07 and 08 5.3s and they had similar symptoms.
    Good Shooting, MarkCO

    www.CarbonArms.us
    www.crci.org

  4. #14
    Machine Gunner Martinjmpr's Avatar
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    The Tahoe/Yukon forum has a lot of good institutional knowledge. I would go there and post the question.

    http://www.tahoeyukonforum.com/

    Warning: The site is ad-heavy and can be a bit buggy.
    Martin

    If you love your freedom, thank a veteran. If you love to party, thank the Beastie Boys. They fought for that right.

  5. #15
    Beer Meister DFBrews's Avatar
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    Figured it out broken valve spring #3 intake going to swap it out and see what happens. I did bore scope the hole and it doesn't appear to have hit the piston
    You sir, are a specialist in the art of discovering a welcoming outcome of a particular situation....not a mechanic.

    My feedback add 11-12 ish before the great servpocaylpse of 2012

  6. #16
    BIG PaPa ray1970's Avatar
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    Quote Originally Posted by DFBrews View Post
    Figured it out broken valve spring #3 intake going to swap it out and see what happens. I did bore scope the hole and it doesn't appear to have hit the piston
    Good catch. I used to replace a lot of broken valve springs on the 3.8 V-6 engines back in the early to mid 1990's. I haven't heard of the 5.3 breaking valve springs. Is this a fairly common problem or did you just happen to have one fail?

  7. #17
    Diesel Swinger Graves's Avatar
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    Quote Originally Posted by DFBrews View Post
    Figured it out broken valve spring #3 intake going to swap it out and see what happens. I did bore scope the hole and it doesn't appear to have hit the piston
    Soooo, I can have my parking spot back meow?
    -Mike

    "I have to return some video tapes"

  8. #18
    Beer Meister DFBrews's Avatar
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    Quote Originally Posted by Graves View Post
    Soooo, I can have my parking spot back meow?
    No.
    You sir, are a specialist in the art of discovering a welcoming outcome of a particular situation....not a mechanic.

    My feedback add 11-12 ish before the great servpocaylpse of 2012

  9. #19
    Beer Meister DFBrews's Avatar
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    Ray I dont know I have not had a chance to do any research on it I found it after work. ( the tahoe is sitting in my working parking I have been working on it as I have had time.

    My last 3 vehicles have been 2 Subies and now a tacoma with a 1991 GMC being the last amercian car i owned. so I am out of the loop on the american engine side.
    You sir, are a specialist in the art of discovering a welcoming outcome of a particular situation....not a mechanic.

    My feedback add 11-12 ish before the great servpocaylpse of 2012

  10. #20
    I am my own action figure
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    Quote Originally Posted by ray1970 View Post
    Good catch. I used to replace a lot of broken valve springs on the 3.8 V-6 engines back in the early to mid 1990's. I haven't heard of the 5.3 breaking valve springs. Is this a fairly common problem or did you just happen to have one fail?
    On AFM engines, yes. Not on the others.
    Good Shooting, MarkCO

    www.CarbonArms.us
    www.crci.org

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