Rochester Qjet Adjustment Advice - Team Camaro Tech
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post #1 of 5 (permalink) Old Dec 29th, 02, 06:47 PM Thread Starter
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Im in need of your expertise, ive got a 305 w/ a rochester qjet carb. now it has 2 adjustment screws on it, one on each side. standing in front of the vehicle looking at the carb there is an adjustment screw on the drivers side in front of the accelerator cable, and on the passenger side under the electric choke is another adjustment screw. now please tell me what each screw is for, and what they are for, and how to adjut them, and what scenarios would i have to adjut them, basically i need to know what steps are necessary to adjust them what the proper procedure . tell me everything i need to know about these 2 screws. thanks

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post #2 of 5 (permalink) Old Dec 30th, 02, 02:17 AM
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I'll try to explain....

The screw on the left (pass) side is the fast idle screw. This comes into play when the choke plate is closed, its linkage pulls in a cam and this screw rides on the cam. To set fast idle, allow the engine to come to complete oper temp. Shut engine off, open throttle part way, manually close choke with finger, close throttle, release choke plate, choke plate should go open since engine is warm.

Start engine and set fast idle rpm by adjusting this screw, say 1400-1600 rpm?

The screw on the right (driver) side? There might be two - one on the carb body. This sets curb idle or base idle with no load or accessories turned on, usually set for 650-850? Whatever the book would suggest.

The other screw - directly in front of the throttle cable. It would be part of a solenoid(?) and would come into play when the A/C is turned on. With this load on the engine, the rpm drops, solenoid kicks out, thereby raising the engine rpm back to the same, if not alittle more than no A/C rpm.

Hope this helps.... Stay warm!!!

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post #3 of 5 (permalink) Old Dec 30th, 02, 02:18 AM
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The one by the throttle is probably your idle. The one near the choke could be how far the choke opens or closes. There really aren't any other adjustments on electronic Quadra Jet carbs. If it's running OK, don't screw with it.



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post #4 of 5 (permalink) Old Dec 30th, 02, 02:33 AM Thread Starter
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Thanks Everett you explained everything to me just the way i was hoping, in words i could understand...that make perfect sense to me and ill now be able to correctly adjust my carb, ill let you know the results. thanks again and Happy New Year

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post #5 of 5 (permalink) Old Dec 30th, 02, 10:25 AM
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Fast idle speed is 2200 rpm's for a first gen Camaro. Might be the same for a later model.
David

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