Re: I never thought I would see the day...

Posted by ericlb on May 05, 2017 at 15:53:57 from (67.142.173.25):

In Reply to: I never thought I would see the day... posted by Dave H (MI) on May 05, 2017 at 11:07:00:

i work on my old trucks too as most of these "mechanics" wernt even born when my trucks were built, off idle stumbeling sounds like the accelerator pump diaphragm is failing, and its a wear part, you can look at the linkage on the top left corner, there will be a usually light green metal flat blade with a rod on one end, there may or may not be a extra hole in the bar for the rod, changing the holes, which changes the location of the pump diaphragm in the carb bore, can be done by placing a pocket screwdriver between the piviot pin, [ your going to have to be able to push the pin back in after you move it to the other hole] and the carb body , then push the piun toward the carb body and against the screwdriver, if you used a small enough screwdriver you can then lift up the green metal blade and re position, it then push the pin back in, now, this may or may not fix it, BUT if it changes it, then you onto at least part of the problem, if the skirt on the pump diaphram is torn, and its very likley you will have to order a carb kit, at the local parts store, and theyll need the carb number, not the truck id, more than one carb was used on the same truck in the same year, depending on options the carb number is always a long STAMPED number, not a cast number, once you have the kit, brace yourself cause your going to have to take this thing apart! now dont get the fantoids just yet, go to u-tube and search quadrajet rebuild, i strongly suggest you not only watch the video in its entirity, but download it as well,this allows you to reference it one step at a time, its much easier once you see it done than it is to make sense of the paper instructions that come in the kit. its not that its hard, its not, the main thing is you need to pay attention to where you get stuff from, it has to go back right there again, and work on a clean surface, and i mean clean! once you clean your parts, take plenty of pics with your cell,as you dissassemble the carb, you may want to reference them later, once your sucessfull you can fix others carbs , as your probably the only one around your area that will know how ! $$$

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