Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem
Idle problem
Cliff Ruggles:
The 350 is a small CID engine, so it's seeing that cam as a pretty big camshaft. In any and all cases, give the engine the fuel it wants in all areas to be happy. If it's lean at idle, open up the idle system accordingly.
Compression ratio, cam timing, and ignition timing play a HUGE role in idle quality, and idle fuel requirements.....Cliff
Pat:
I solved a similar problem by accident. My heater wasn't putting out hot air on a freshly rebuilt 350. My carb stumbled upon stepping on the gas and did several adjustments to the carb with no sign of improvement. I was frustated. So one cold morning I covered the grille with tape and plastic to help the heater. To my surprise, my heater put out hot air and the stumble miraculously went away. Just before a full stop, I thought my engine was going to die but it was because it started idling much more smoothly. Going from a 160 to a 195 degree thermostat was the fix. Carbs will work better with a hotter engine while keeping the carb itself as cold as possible. Something to consider.
Cliff Ruggles:
I'm not even sure why they sell 160 degree thermostats, and yes, heat is your friend with these things.
Just curious if the heat crossover in the intake is also blocked off?......Cliff
Pat:
It's nonexistent, Cliff. I have a Vortec engine.
Cliff Ruggles:
For a wet flow system it will work best fully warmed up and heat soaked. That may take a while when there is no heat crossover in the intake, and even longer if the intake has an air gap under it.....Cliff
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