Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem
Video of bog and die problem
dkraven:
https://youtube.com/shorts/2mJjbUTtik4?si=vpl7nwg1yskoEhSa
https://youtube.com/shorts/3TgAzOTXzc8?si=njhpAi5TVdd1Phmq
Here's video of my issue that I posted about previously. It's idling at 1100, of course idle decreases when put in drive, and then when given throttle it dies. Thought it was the accelerator pump but that squirt is decent isn't it? I should add that when given throttle in park there's no bog and it revs nicely.
Tyler73Deville:
Check timing, make sure it's good.
look for vacuum leaks, check the float and the n/s assembly. I see some gas puddling around the pump shaft, buy cliffs SR rebuild kit since the gaskets are high quality and don't "wick" like the other rebuild kits do, it even comes with a new accelerator pump you can launch a flighter jet with and float you said you did not replace in the previous post.
Cliff Ruggles:
Three things need to happen with a quick/heavy application of the throttle to prevent stumble, hesitation, bog or stalling like you are seeing.
The accl pump shot MUST be instant and deliver adequate fuel to cover up a lean condition.
The power piston moves up at the same time and must move quickly with quick throttle movements.
Ignition timing advances with RPM. The advance curve should start right off idle speed and advance smoothly as RPM's increase. A delay there or not advancing at all will add to your carb issues.....
dkraven:
I'm going to rebuild it again with your kit, so will hopefully address accel pump and power piston issues there. Your accel pump quality should make a difference. What should I do to make sure the power piston is performing correctly when I rebuild it?
Someone told me to just add bushings on the primary shaft because there's a good chance I'm losing vacuum there when I apply throttle. Thoughts on that?
Cliff Ruggles:
Installing bushings will do NOTHING for that issue as when you apply throttle vacuum drops off.
Bushings are still a good idea as it reduces side play at the primary shaft to less than .001" and eliminates any vacuum leaks at idle speed which can have a negative effect on idle tuning.....
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