Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

Fresh engine won't idle

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77cruiser:
That cam should idle with a min. of 14 inches maybe even 15.

Seff:
Gotcha, thanks. I'll let you know what it idles at.

When should I be considering idle bypass air? The book says "larger camshafts", but doesn't specify how large.

Seff:
The engine idled at 18-19" when I put on the gauge, and now idles at 19" after adjustment. Are you guys SURE this engine needs that many carb mods? I had a vacuum leak back when I initially tried to start it up, mind you.

blazer74:
What's your idle rpm? Seems like a lot of vac for a 221 cam.

Seff:
It was 900 at that time. Any lower and the engine shakes and gets rough. Or, it did. I've since added idle bypass air (0.080" both sides), and have yet to calibrate the idle mixture and idle speed since.

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