Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

Engine dies on intitial cold start

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liberty:

When starting cold, engine starts and idles fine but if I put it in gear (automatic) it immediately dies.  On restart there is no further problem.  Ambient temperature 60 degrees. Carb: 17058204, electric choke, blocked EGR - GM Crate engine 12499529, 290hp, GM aluminum intake manifold 10185063

Cliff Ruggles:
This is actually the result of being pretty close with your choke pull-off adjustment, but just a tad lean, or the flap is open just a touch more than the engine can tolerate on a cold start-up.

On a good note, it's better than being a bit too rich, as this is not a good scenario for the engine.  You might try adjusting the pull-off slightly by turning the adjustment screw clockwise every so slightly, which should help the situation. 

It make take several cold start-ups to find the most ideal adjustment, and it may require just a bit less choke flap open angle for colder temperatures than what you are seeing now?......Cliff

liberty:

--- Quote from: Cliff Ruggles on January 29, 2009, 05:24:36 AM --- You might try adjusting the pull-off slightly by turning the adjustment screw clockwise every so slightly, which should help the situation. 

--- End quote ---

Thanks for the informatiion - I'll experiment with the pull-off.

Incidentally, I'm a short distance through reading your Q-Jet book and have learned more in an hour of reading than I have in years of magazines.

Cliff Ruggles:
Thanks.  I tried to cover as much about the Q-jet as possible in 128 pages. 

When I prepared my first outline for the book, we had over 70 pages just in the High Performance Chapter!  The publisher wanted 6 chapters pretty close in size, so we had to leave some of the more complicated stuff out.

If/when we do a re-write, I'll put in quite a bit more information on building race units and more complicated modifications, etc.......Cliff

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