General Category > Quadrajet Carb Talk and Tips

Calif. emissions

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Cliff Ruggles:
Should be idling great with stock idle settings.  I'd pull the idle tubes and clean them up or replace, and check the size.  Unless they have been removed, they may be plugged up some, causing the rough idle.

The power curve is EXACTLY what I'd expect for the combination of parts.  882 heads are very restrictive in the exhaust ports, designed for emissions, not for performance.  They work best with dual pattern camshafts, and best suited for low rpm applications.......Cliff

85stepeide:
The carb was purchased 6 years ago from a national carb rebuildeing service. I dont think it has any kind of modifications. My truck has always had a ruff idle. After the first smog test, the smog tech told me the carb was lean, thats when I went to a little larger main jet, but dont remember what I used.  The change did help with cruising and mid range, but still a crappy idle. After 6 years the carb is starting to leak, and the choke is starting to stick ,so now is a good time to rebuild and fix the idle. Ill check the idle tubes, what size do you suggest I use.   

Shark Racer:
Step 1 is to make sure they can flow. In the book, Cliff has some suggestions on tube sizes. Look at the section on performance upgrades to the idle system.

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