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09-01-2012, 11:17 PM
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#1 |
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Registered User
Join Date: Oct 2011
Location: oakdale ca
Posts: 552
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idle screw on q-jet?
so my c30 has a 454 with a q-jet carb is there a way i can adjust the idle? it has a bigger cam but doesnt sound like it idling. it i want it to be more loopy. can i slow my idle down? i heard you can adjust your idles on these carbs is that true? any help apperciated thanks
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09-01-2012, 11:29 PM
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#2 |
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Registered User
Join Date: Mar 2012
Location: edgartown mass
Posts: 852
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Re: idle screw on q-jet?
just back out the screew on the throttle linkage and that should do it
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1986 c20 "the hillbilly" 350 sm465 3.42gears 21mpg at 70mph 1985 k30 "the ice cream truck from hell" no rust az truck 197-8??? c30 "ramp truck" 454 1978 monte carlo 350 350th with 2.73 gears. no rust. sc car |
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09-02-2012, 12:48 AM
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#3 |
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Registered User
Join Date: Oct 2011
Location: oakdale ca
Posts: 552
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Re: idle screw on q-jet?
would that be by the carb?
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09-02-2012, 08:09 AM
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#4 |
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Registered User
Join Date: Mar 2012
Location: edgartown mass
Posts: 852
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Re: idle screw on q-jet?
yes it is. it is right where the cable goes to the carb. also i dont know what cam you have but after a point they need more rpm to idle. one i had any less the 1000 it would fade out and stall
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1986 c20 "the hillbilly" 350 sm465 3.42gears 21mpg at 70mph 1985 k30 "the ice cream truck from hell" no rust az truck 197-8??? c30 "ramp truck" 454 1978 monte carlo 350 350th with 2.73 gears. no rust. sc car |
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09-02-2012, 10:18 AM
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#5 |
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Just here to tinker
 
Join Date: Jun 2008
Location: Holland, MI
Posts: 3,689
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Re: idle screw on q-jet?
Umm, what rpm is it idling at now? Is the truck manual or auto? Either way, your idle should be no less than about 650-750. If you're around that rpm and it still doesn't sound lumpy then the cam you have is not that aggressive. That "lumpy" sound comes from valve overlap.
Posted via Mobile Device
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78 C10 SWB Diesel #1 (wrecked)http://67-72chevytrucks.com/vboard/s...1978+silverado 78 C10 SWB Diesel #2 (sold)http://67-72chevytrucks.com/vboard/s...d.php?t=650751 60 GMC Suburban (sold)http://67-72chevytrucks.com/vboard/s...d.php?t=445526 60 GMC 1000 (sold)http://67-72chevytrucks.com/vboard/s...d.php?t=298235 67 GMC 1500 (sold) http://67-72chevytrucks.com/vboard/s...d.php?t=803695 86 Suburban(summer unit) http://67-72chevytrucks.com/vboard/s...d.php?t=810697 88 Suburban 4x4(winter unit)https://67-72chevytrucks.com/vboard/...25#post8900725 |
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09-02-2012, 03:10 PM
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#6 |
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Registered User
Join Date: Oct 2011
Location: oakdale ca
Posts: 552
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Re: idle screw on q-jet?
its auto. when its cold its at like 1k when it warms up its at like 5-600
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