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q-jet about to get tossed!!!!!!

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by CAROLINAK5, Sep 5, 2001.

  1. CAROLINAK5

    CAROLINAK5 1/2 ton status

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    ok i got the thing mounted. it idles good runs fine on the road until you kick it to get the 4-barrel...then the truck wants to hesitate and the truck slows down....what's up? any ideas?
     
  2. BIGRIG

    BIGRIG 1/2 ton status

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    Do you have your Kickdown hooked up and adjusted right? or may be the rear barrels are not opening.....usasully vacuum secondarys.

    Chris

    MY DRINKING TEAM HAS A FOUR WHEELING PROBLEM![​IMG]
     
  3. Blazer_Boy

    Blazer_Boy 1/2 ton status

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    Probably could stand and overhaul and be re-metered. Q-jets are really good carbs but get knocked on alot because people compare stock ones to Holleys and such.

    <a target="_blank" href=http://www.geocities.com/bigkern76>http://www.geocities.com/bigkern76</a>
     
  4. check your linkage. on some there is a linkage (?) that keeps the secondaries from opening if the choke is on. this could be stuck on yours or your choke could be stuck, causing this to happen.

    <font color=blue>American Pie 2-"Have you seen my flute?" "Yeah, I stuffed it in your box."</font color=blue>
     
  5. ArmyEd

    ArmyEd Registered Member

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    how about some more info on this linkage thing, i think i have that problem too, if the linkage is missing, can you get it someplace to fix it?
     
  6. i think if you were missing that part of the linkage you would have an all together different kind of problem. i guess if it was missing and the motor was cold and you floored it, it would fall on its face because the secondaries would open when they shoulden't and give the motor to much air. but this would only be the case when the motor was cold.
    i'm no carb expert but i've played around with q jets a bit and rebuilt a couple. just play around with the linkage and figure out how they all interact and make sure its all moving smoothly. then start your rig and make sure everything is working right. hope this helps.

    <font color=blue>American Pie 2-"Have you seen my flute?" "Yeah, I stuffed it in your box."</font color=blue>
     
  7. Roostr84

    Roostr84 1/2 ton status

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    Alot of times hesitation in Qjets are solved by tightening the secondary air valve spring up.

    Chris =)

    I think the exhaust fumes have finally gotten to me!!
     
  8. Blazer79

    Blazer79 1/2 ton status

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    I agree with Rooster. It's a small screw on the end of the secondary shaft. There is a tiny allen screw that tightens it so you must loosen it first and then adjust the adj. screw. Tighten it to make the valves harder to open and loosen it to make them open sooner. Move it about 1/8 of a turn and take it for a drive. If that doesn't work, try another 1/8. Don't forget to tighten the allen screw back.

    What this really does is to thread a spring inside. When you tighten the screw, the spring gets stiffer and will delay the opening of the secondary valves.

    Good luck.

    <font color=purple>//////
    <a target="_blank" href=http://blazer79.freeyellow.com>blazer79.freeyellow.com</a></font color=purple><font color=black>
    Soon a 454 K5!!</font color=black>
    [​IMG]
     
  9. CaptCrunch

    CaptCrunch 1/2 ton status

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    I'll give rooster a third vote. Quads aren't all bad... I usually say get to know them by reading or for get it and get your self an Edelbrock which is much more user friendly tuningwise IMO.

    -Mikey
    1987 Chevy K5 Blazer- 350 TBI
    <a target="_blank" href=http://coloradok5.com/gallery/captcrunch>http://coloradok5.com/gallery/captcrunch</a>
     

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