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Why does it stall when I put it in gear?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by BAMA74K5, Apr 13, 2001.

  1. BAMA74K5

    BAMA74K5 Registered Member

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    Every time I put my K5 in gear the engine stalls out. When it is not in gear it idles at about 1000 rpm. I can set the idle up to about 1800 and it will not stall out, but that is way too high of an idle. Is there something I am missing when I am setting my idle speed. The engine is a 350 and the carb is a Q-jet. Any help would be great.

    Thanks in advance,
    Rush
     
  2. Gandolf

    Gandolf 1/2 ton status

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    Try lowering your idle speed to around 750, in neutral, and see if the engine will stay running. If it doesn't, then there is something wrong internally in the Q-Jet idle circuit. This is assuming that the plugs, wires, cap, and rotor are good.

    '89 K5 Silverado..."You can’t have a real adventure, unless the outcome is truly uncertain".
     
  3. dyeager535

    dyeager535 1 ton status Premium Member

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    You very well could have a vacuum leak. Also check everything else already mentioned. With one bad plug I woud get a surge at 60mph..could definitely feel it. Make sure the carb to intake bolts are snug, as well as all the bolts on the top of the carburetor. Depending on the vintage, they are either Torx or flat blade. Do NOT overtighten them, the carb is very soft and the botls will strip out or crack the carb...but they need to be snug.

    Dorian
    My K5 and Chev/Olds tech/links page: <A target="_blank" HREF=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</A>
     
  4. BAMA74K5

    BAMA74K5 Registered Member

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    Does anyone know where I can get a vacuum diagram for my K5. I want to make sure that I have everything hooked up right.

    Thanks

    Rush
     
  5. thatK30guy

    thatK30guy 1 ton status Premium Member

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    Yep, sounds like a vacuum leak. Good luck with the can of carb cleaner to search for the culprit. [​IMG]
     
  6. dyeager535

    dyeager535 1 ton status Premium Member

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    Jeez, a '74 should be about the easiest one out there, no vacuum diagrams needed : ) lol. Lets see, with Q-jet, the drivers side front, small fitting, about midway up the carb is the vacuum advance port. Large one at the bottom is for PCV. Upper front passenger corner, pointing towards the ground at a 45 degree angle, is for the choke pulloff diaphram. Since you have no computer, you should be able to disconnect every single vacuum line, and plug/cap the port at the carb...that will tell you if the vacuum leak is in a line or not. Believe some '74 models got EGR, that should be a "timed" vacuum port on the carb, just like vacuum advance..IE no vacuum at idle. I'm assuming this is for the '74 in your profile right?

    Dorian
    My K5 and Chev/Olds tech/links page: <A target="_blank" HREF=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</A>
     

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