2013 Tons of Loss of power driving up hills in the Mountains

Discussion in 'General GM Discussions' started by Mro111, Jan 18, 2018.

  1. Mro111

    Mro111 New Member

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    Hello,

    I have a 2003 GMC Yukon V8 5.3 SL
    and it seems to drive just fine in the flat city surface streets but when i take it to the mountains driving up a hill i lose a significant amount of power. I have done a tune up changing spark plugs and wires but still scratching my head. Any Suggestions??

    Thanks!!
     
  2. Tim W

    Tim W Timbrage: Engage

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    what modifications do you have? how many miles on it? what parts did you use when you tuned it up?
     
  3. elkhornson

    elkhornson GMFS Member

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    I would have a good mechanic determine whether you have a blown head gasket (not unusual with GM engines). It won't show on a scope but having coolant going into the cylinders will make the engine function as though it was getting too much fuel and stalling as a result. Failing Throttle Position Sensor will have a similar impact on performance.
     
  4. Tim W

    Tim W Timbrage: Engage

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    that's a bit extreme with the information given
     
  5. Phildirt

    Phildirt n. fil-dert.

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    This dude dips in once every 2 months or so and goes full negative nancy on about 6 threads and then dips back out. I think he’s hit his quota today.
     
  6. rayw

    rayw New Member

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    believe I would check the catalytic converter could be stopped up or mabe a sock filter in the fuel tank
     
  7. tyoneal

    tyoneal New Member

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    I had the same problem with a 97 k2500 Suburban with a 454.

    Going up a strong grade is always going to slow you down, the biggest is the rise in elevation due to being in the mountains. Mine was a total dog in the mountains.

    Get a turbo or a SC and that will help immensely at high altitudes. (The air is Thinner than at sea level.)

    Try running at high altitude yourself, as you need the denser air so does your truck.

    For me it was night a day, plus it becomes a screamer on a level road.

    Good Luck,

    Ty
     
  8. Mro111

    Mro111 New Member

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    I have 105k miles OEM spark Plugs and K&N Cold Air intake with 4inch lift kit. I notice other trucks even older climbing up the hills easier and faster. Thank you for your comments this will give me a place to start.
     
  9. Phildirt

    Phildirt n. fil-dert.

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    ...what size tires/what gear ratio? That is where I’d start. Not with spark plugs.
     

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