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Power lag on hills

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Dewy86k5, Feb 2, 2001.

  1. Dewy86k5

    Dewy86k5 Newbie

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    Location:
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    Besides the problem with my choke, I have a serious power lag going up hills. I am moving from VA to Washington, and going over some of the mountain passes I'll be strugeling to do even 40 mph. Before I left VA I replacer the heads, pu a new q-jet carb on, and punched out the cat and put a new muffler on. I'm not sure if the q-jet is tuned right, but the parts house I got it from said that it came pre-tuned for a 305.

    Any sujgestions would be greatly appreciated.
     
  2. fr8train

    fr8train 1/2 ton status

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    Any mods to your truck? What is your gear ratio? Tire size? Have you done a tune up in awhile? Is it sluggish on flat land? More info needed. Will post as much as possible to help.

    " What day is today?....Febuary.....Its nudie magazine day!!!!!!!! " - Billy Madison
     
  3. Dewy86k5

    Dewy86k5 Newbie

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    No mods that I know of. I've only had it since Dec. and I was just trying to get it running good enough for the trip. It seems a little slugish when starting out (flat), but once you get her going she does ok (nothing to write home about). Don't know the gear ratio, running 31x10.5x15. Also someone cut out all the emessions vacuum system.
    Right now I'm in San Diego, and have to go over 2 or 3 more mountain passes to get to Seattle. I'm dreading the trip up there, but don't have any time to work on it before I go. Just trying to figure out what to do once I get there.
     
  4. HarryH3

    HarryH3 1 ton status Author

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    Sounds like a combination of having a 305, 3.08 gears and driving at altitude. The altitude really dogs engine power. 3.08 gears keep the engine below the power band most of the time. They work great for getting better mileage on flat land but they aren't the best for long climbs at altitude. There should be a tag in the glove box of your truck that has a bunch of 3-digit codes. The gear ratio codes start with the letter G. Get those codes and we can tell you what gears you have ( or at least what gears the truck left the factory with).

    <font color=black>HarryH3 - '75 K5</font color=black>
    <A target="_blank" HREF=http://ThunderTruck.ColoradoK5.com>http://ThunderTruck.ColoradoK5.com</A>
     
  5. blazen91

    blazen91 1/2 ton status

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    Gutting the cat could be a problem also. An engine needs back pressure for toque. I would guess most of your problem is gears. I know my 3.08's suck on hills.

    <A target="_blank" HREF=http://www.blazen91.coloradok5.com>http://www.blazen91.coloradok5.com</A>
    Protect the land FOR the people
    Not FROM the people
     
  6. Emmettology 101

    Emmettology 101 3/4 ton status

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    A 305 is bad on power, especially when combined with 3.08 gears.. I would probably save for a 350 swap.

    Mike [​IMG]
    See <font color=green>EMMETT</font color=green> -&gt; <A target="_blank" HREF=http://emmett.coloradok5.com>http://emmett.coloradok5.com</A>
     
  7. 4GUNZ4X4Z

    4GUNZ4X4Z 1/2 ton status

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    Gears gears gears. I've got 3.08's and I've got serious lag going up hills and I've got a punched out 350 w/lots of torque enuff to blow a 208 into 4pieces, twist a drive shaft like a soda pop can, and bust a rear yoke in half all in 1 shot. Thx to a hill named U-Joint.

    3.08's no good...bad...bad. Darn boat anchor's.

    <font color=blue>Professional <font color=red>JEEP EATER</font color=red> it's a population control thing.</font color=blue>[​IMG]
     

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