Idle screws on a 2 barrel - The 1947 - Present Chevrolet & GMC Truck Message Board Network

cliffsta · 02-23-2005, 11:50 PM

Well ever since we did the timing set, the carburetor's idle has been WAAAYY high. I know my couisn f'ed with the screw that is on top(?) that you can only get to with the air cleaner off. The other one that is on the throttle is prob wachk too. I know the timing is right (around 8 or 9 BTDC) at the right RPM idle.
It idles about where it should in drive, but when in park or neutral (when its on the high idle screw) its waaay TOO HIGH. As in, if you cut it off without bumping the throttle to get it off that high idle, it knocks LIKE A BEAST from being revved soo high, and the moment turns it over a few more times. Yeah, i know, major looseness of the motor. What ya expect, its got somewheres around 160G, the supposed end of the life of a 305.
So if i play with that screw on top (?) of the carburetor, can i get the high idle to be lower, and the idle in gear to be about the same?
This is the OE Rochester DualJet 2 barrel on my 1980 305.
thanks guys

cliffsta · 02-25-2005, 05:08 PM

Wow, no ideas?

TrainD5115 · 02-26-2005, 11:49 AM

There are two options that I see from my exploded view of a dualjet. You have the fast idle screw on the right side which contacts the fast idle cam during warm up. On the left side you have idle stop screw near the idle speed solenoid.

02-23-2005, 11:50 PM	#1
cliffsta Stepsides RULE Join Date: Jul 2004 Location: Pineville, LA Posts: 1,921	Idle screws on a 2 barrel Well ever since we did the timing set, the carburetor's idle has been WAAAYY high. I know my couisn f'ed with the screw that is on top(?) that you can only get to with the air cleaner off. The other one that is on the throttle is prob wachk too. I know the timing is right (around 8 or 9 BTDC) at the right RPM idle. It idles about where it should in drive, but when in park or neutral (when its on the high idle screw) its waaay TOO HIGH. As in, if you cut it off without bumping the throttle to get it off that high idle, it knocks LIKE A BEAST from being revved soo high, and the moment turns it over a few more times. Yeah, i know, major looseness of the motor. What ya expect, its got somewheres around 160G, the supposed end of the life of a 305. So if i play with that screw on top (?) of the carburetor, can i get the high idle to be lower, and the idle in gear to be about the same? This is the OE Rochester DualJet 2 barrel on my 1980 305. thanks guys __________________ 1981 Chevy C10 Custom Deluxe Stepside 350 V8, headers, side exhausts, 3-speed auto SOLD 1980 Chevy C10 Custum Deluxe Stepside 305 V8, Edelbrock Performer Intake, Edelbrock 1406 600CFM 4-barrel, TH350C. Bent rod. SOLD 1984 GMC Sierra Classic Longbed 6.2L Diesel SOLD 2009 Kawasaki KLX-250S too many mods for this signature 1999 Honda Accord EX 4-cylinder, 17" Motegi Wheels 215/45/17 Sumitomo tires, Tein S-Tech lowering springs, KYB GR2 shocks, Acura TL 20mm rear swaybar, debadged, blackhoused headlights, Short-Ram Intake Cardomain of the Accord

02-25-2005, 05:08 PM	#2
cliffsta Stepsides RULE Join Date: Jul 2004 Location: Pineville, LA Posts: 1,921	Wow, no ideas? __________________ 1981 Chevy C10 Custom Deluxe Stepside 350 V8, headers, side exhausts, 3-speed auto SOLD 1980 Chevy C10 Custum Deluxe Stepside 305 V8, Edelbrock Performer Intake, Edelbrock 1406 600CFM 4-barrel, TH350C. Bent rod. SOLD 1984 GMC Sierra Classic Longbed 6.2L Diesel SOLD 2009 Kawasaki KLX-250S too many mods for this signature 1999 Honda Accord EX 4-cylinder, 17" Motegi Wheels 215/45/17 Sumitomo tires, Tein S-Tech lowering springs, KYB GR2 shocks, Acura TL 20mm rear swaybar, debadged, blackhoused headlights, Short-Ram Intake Cardomain of the Accord

02-26-2005, 11:49 AM	#3
TrainD5115 North Coast, baby! Join Date: Jun 2004 Location: Toledo, OH Posts: 437	There are two options that I see from my exploded view of a dualjet. You have the fast idle screw on the right side which contacts the fast idle cam during warm up. On the left side you have idle stop screw near the idle speed solenoid. __________________ Brad 79 Scottsdale C20 350/350 3.73's Still running full CA smog gear!

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.