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How to diagnose a Quadrajet part 2


 


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How to diagnose a Quadrajet part 3
Let's take a look inside





How to diagnose a Quadrajet part 1
I get lots of questions about poor running issues. Here's how to check them out.





New quadrajet set up
New air-gap manifold and custom/rebuilt q-jet. Sounds good but I still need to set the timing on the distributor and the carb is tuned already. Hope you like, nothing to fancy just a few revs and walk around...the Exhaust is true dual no x/h pipe and it has cherry bomb glasspacks(3 inch)





How to debog your Quadrajet part 3
In the first two videos we looked at operational theory of the Quadrajet. In this episode we'll explore a couple mistakes the home mechanic often makes in an effort to improve the performance of this unit.





How to adjust Quadrajet secondary air doors
These take some trial and error to get them adjusted so that there is no bog, but it's not hard to do-here's how.





How to de-bog your Quadrajet part 1
Sorry guys, I got the videos a bit out of order. The Rochester Quadrajet has gotten a bad rap over the years, often called a Quadrabog or Quadrajunk. In fact, this is a great multipurpose carbureter once you understand how they work and what not to do to them. In this clip I introduce you to the Quadrajet and begin explaining the theory of operation of these units. Enjoy!





Identifying Quadrajet vacuum ports
I always see a lot of questions about what various vacuum ports do on a Quadrajet. Here's a general guide that will point you in the right direction. Remember that there were many different Qjets over the years and vacuum port locations and number will vary. This video is representative of 1975-90 carbs. Enjoy!





quadrajet-cam
See 1976 Chevrolet pickup with Rochester quadrajet upgrade on SBC 350 V8. We removed the hood, mounted a camera looking down on the air horn, and took it for a spin, running wide open on an uphill grade. See how the secondary air valve responds to rpm drop at each upshift of the THM. Also included is a smoking burnout.





How to rebuild a Rochestor Quadrajet part 1
Introduction and beginning the disassembly process





How to measure and adjust Quadrajet float level
I have had several requests for this, so here you go: 1. The airhorn has to be removed to do this, but the carburetor does not have to be removed from the engine. 2. Some data says to measure from the toe(end that is opposite from the hinge), some say 5/16 inward from the end, etc. I suggest following the specs for your particular carburetor. 3. With the float in the raised position and the inlet needle lightly seated, measure from the top of the float to the top edge of the carburetor with NO gasket in place. If you have to adjust the float, bend at the area that has the cutouts, 4, If you are experiencing flooding issues then it is an excellent time to install a new needle/seat and float and that should cure flooding problems that are not choke-related.





Rochester Carburetor Trick!
If your Rochester Quadrajet or Dualjet Carburetor is Hesitating try this Trick!





How to rebuild a Rochester Quadrajet part 3
Finishing up the disassembly.





How To Adjust the Choke on Rochester Carburetor By Hopkins
This video shows how to set the Automatic Choke on a Rochester Carburetor with a 350 (small block) chevy Engine,





Combination valve bad, carburetor bogging
After doing the brakes -- the combination valve is bad-- the valve part is seized. Troubleshooting the bogging... Gapped plugs, plugged vacuum lines, check carb mounting bolts, distro shaft has no wobble, the mechanical advance seems good (I guess-- moves freely), accelerator pump squirts well





re-jet your Quadrajet (part 1)
rejetting a quadrajet





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