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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.





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.





More Quadrajet tuning, some things! Part one in this saga on Sept 13, 2010
The car has a slight stumble and surge at a light throttle cruise at about 55 to 60 MPH. By swapping out the .050 metering rods to .048 units, the stumble and driveability concerns are now gone. Going richer would mean worse fuel mileage one may think? No! Now that the mixture is right, LESS throttle opening is needed now, which means higher vacuum, and this way the metering rods will block off the correct amount of fuel, and in the proper timing and percentages, so the car runs much smoother. As stated many times, patience and reading up on, and understanding how these intricate carburetors work will help out very much! Enjoy!





Understanding the Computer-controlled Quadrajet part 2
Continuing the examination of this carburetor so we can see what's different and what is the same.





Decoding a Rochester Quadrajet part 2: Breaking down the numbers
In this clip we'll learn how to decipher the Identification number and julian date code on the Rochester Quadrajet.





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.





Rochester Quadrajet Dualjet Idle Mixture Plug Removal, Plus "Special" Tool !!!
How to Remove Hardened Idle Mixture Plugs in a Rochester Quadrajet or Dualjet without Destroying the Throttle Body, and, My "Special" Idle Mixture Screw "Adjusting Tool" !!!





Decoding a Rochester Quadrajet part 1: The name
Rochester Quadrajets tend to mystify people because of the various model names assigned to them by GM. Add to that a redesign in the '70s and the confusion only grows. In this video we'll learn the different model names and also how to differentiate between early and later-model Qjets. 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.





for Tim - Rochester tips





How to rebuild a Rochester Quadrajet part 4





Everything you wanted to know about automatic chokes but were afraid to ask
I've noticed many people drive vehicles with inoperative chokes. Even though chokes can be intimidating, repairing and adjusting them actually is very simple. So, stop pumping that accelerator and follow along as we look at how chokes work and how to repair them.





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





Which car is faster? Which Car is Faster?




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