Rochester Quadrajet issue

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83c10_Owner

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Nov 7, 2022
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Location
Texas
First Name
Dan
Truck Year
83
Truck Model
c10
Engine Size
305
I have a Rochester Quadrajet carb 17083224 on a 83 c10 Silverado with a 305 engine. Also everything is stock. My question is, trying to adjust the carbs fast idle and it effects the curb idle. Well I try to fix the curb idle and the fast idle is affected also the next morning. I’m still learning on the carb so is it a vacuum issue or something else. It acts that way during cold or cooler weather not in warmer weather.
 

fast 99

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Spokane, Washington
First Name
Brian
Truck Year
81,85
Truck Model
K20
Engine Size
350
When choke is completely warmed fast idle on right side shouldn't change idle speed. Either choke isn't warmed enough [no preheat], bad choke thermostat [check for open circuit ohm it] linkage is stuck and/or not adjusted correctly. Try pushing down on the fast idle cam with a finger. Needs 12v power on electrical lead at choke thermostat. There are several other adjustments that will effect cold operation but this is where you should start.
 

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