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2002 Denali..Help

Discussion in 'Engine & Drivetrain' started by Gino 15, Mar 27, 2020.

  1. Gino 15

    Gino 15 TYF Newbie

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    Hello all I just purchased a 2002 Denali when she's cold and I start her up she runs really rough, idle jumps high then down really low almost to the point of stalling out then she'll level out and run fine once she's hot. Getting two different codes of random misfire and bank 2 too lean anybody experienced this before and how did you fix it thanks.
     
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  2. wjburken

    wjburken Supporting Member

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    Welcome to the forum from Iowa.

    What codes are you getting specifically?

    Post those up and the folks here can help you get things sorted out.

    Some more information that can be helpful would be how many miles on the vehicle?

    One last thing would be we like to see pictures of folks vehicles so feel free to post a pic or two.

    @PNW VietVet
     
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  3. Gino 15

    Gino 15 TYF Newbie

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  4. swathdiver

    swathdiver Full Access Member

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    Welcome to the forum Gino!
     
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  5. Gino 15

    Gino 15 TYF Newbie

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    Thanks. She has just over 110k, one of the codes is p0300, and I will post the other when it pops up again
     
  6. Doubeleive

    Doubeleive Supporting Member

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    my first guess would be to check for a intake leak, you can check for that pretty easy, when you first start it up in the morning (while it is still cold) spray some starter fluid around the edges of the intake gasket and see if the idle changes, check real good on the passenger side also because that is bank 2. could be something else but it's something to try that is easy and only cost a couple bucks for a can of starter fluid.
     
  7. Scottydoggs

    Scottydoggs Full Access Member

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    sound sliek its over due for a tune up, and maybe a bad o2 sensor, or a vac leak can cause a lean code. depending on the code of course.
     

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