New Carb - The 1947 - Present Chevrolet & GMC Truck Message Board Network

ppbr2001 · 03-06-2011, 09:44 PM

Just swapped the quadrajet for an Edelbrock 600 performer. Runs great after hitting the throttle but sure idles rough. I hooks a vacuum gauge to it and set the idle mixture at high vacuum but still sounds like it has a race cam in it!!

3r!c84 · 03-06-2011, 09:51 PM

did you mess with the air-fuel mixture screw?

geezer#99 · 03-06-2011, 11:30 PM

Vacuum leak!!! What kind of adaptor did you use?

ppbr2001 · 03-07-2011, 03:44 AM

Used an edelbrock 4 hole quad to square bore adapter.

ppbr2001 · 03-07-2011, 03:45 AM

Where's the air-fuel mixture screw?

oldblue1968chevy · 03-07-2011, 03:31 PM

it only has 2 screws 1 is air 1 is fuel I believe

ppbr2001 · 03-07-2011, 08:53 PM

Could it be the float level? I took the vacuum plug off to hook the gauge up and it idled smoother.

SeanPaintsFlames · 03-07-2011, 10:19 PM

The two screws are left bank-right bank. They need to be even. I would say turn them all the way in, then unscrew them 6 half turns each.

sixshooter798 · 03-14-2011, 11:46 AM

Quote:

Originally Posted by seanpaintsflames

the two screws are left bank-right bank. They need to be even. I would say turn them all the way in, then unscrew them 6 half turns each.

+1

ppbr2001 · 03-09-2011, 01:21 AM

Can't find any vacuum leaks. maybe it ain't supposed to idle smooth!

gchemist · 03-09-2011, 03:34 AM

If you have a vacuum leak, the gauge would tell you. Is the needle steady or moving? What are the RPMs at idle? Which tranny are you running? A 700R4 should have the angle correction bracket installed.

http://www.centuryperformance.com/tu...e-spg-148.html

ppbr2001 · 03-12-2011, 03:34 PM

it has the 700r4 bracket. vacuum gauge is a little jumpy. sprayed ether around fittings and no reaction.

Did readjust float level and helped a little.

rayfinseats · 03-13-2011, 10:38 PM

GO TO Edelbrock.com. They have a bunch of tuning videos for their carbs. Very informative.

http://www.edelbrock.com/automotive_...ech_vids.shtml

ppbr2001 · 03-17-2011, 04:51 PM

Anybody ever drill holes in the primary butterfies?

Goldfinger · 03-17-2011, 08:41 PM

How did you install the egr? mine was sucking air through the manifold and it ran super high and rough. If you need a block off for the egr take the spacer on the egr fill with jb weld bake at 400 for 30m and place gasket sealer on it

ppbr2001 · 03-18-2011, 03:34 PM

Will do. Thanx!!

ppbr2001 · 03-26-2011, 02:49 AM

Just blocked off the EGR valve and it idle as smooth as the top of my head!! Thanks for all the advice!!

gchemist · 03-26-2011, 02:57 PM

Yea, I run mine without the EGR valve!!

oldblue1968chevy · 03-26-2011, 05:30 PM

Whats the EGR tube lol

Goldfinger · 03-30-2011, 11:53 AM

Glad it worked for you. The egr is just an obstruction anyway.

03-06-2011, 09:44 PM	#1
ppbr2001 Registered User Join Date: Mar 2010 Location: Hydro, OK Posts: 89	New Carb Just swapped the quadrajet for an Edelbrock 600 performer. Runs great after hitting the throttle but sure idles rough. I hooks a vacuum gauge to it and set the idle mixture at high vacuum but still sounds like it has a race cam in it!!

03-06-2011, 09:51 PM	#2
3r!c84 Badass Join Date: Jan 2009 Location: lox. fl Posts: 4,586	Re: New Carb did you mess with the air-fuel mixture screw? __________________ Think outside the box? -84c10 (1stcar)→My Build← -00 Saturn 5spd drop a gear and disappear! 1/4:13:90

03-06-2011, 11:30 PM	#3
geezer#99 Registered User Join Date: Aug 2009 Location: Bowser Posts: 13,733	Re: New Carb Vacuum leak!!! What kind of adaptor did you use?

03-07-2011, 03:44 AM	#4
ppbr2001 Registered User Join Date: Mar 2010 Location: Hydro, OK Posts: 89	Re: New Carb Used an edelbrock 4 hole quad to square bore adapter.

03-07-2011, 03:45 AM	#5
ppbr2001 Registered User Join Date: Mar 2010 Location: Hydro, OK Posts: 89	Re: New Carb Where's the air-fuel mixture screw?

03-07-2011, 03:31 PM	#6
oldblue1968chevy Grandpa in the rustmobile... Join Date: Nov 2008 Location: Spokane WA/Viola TN Posts: 11,422	Re: New Carb it only has 2 screws 1 is air 1 is fuel I believe __________________ John Goose-1968 C10 355,9.32-1CR, Vortec Heads ,262 voodoo, 3.73:1 3OTT (HS ride/beater/farm truck) http://67-72chevytrucks.com/vboard/s...d.php?t=317684 Grams 53-1953 Chevrolet Belair http://67-72chevytrucks.com/vboard/s...=1#post4327784 1969 Chevy C10 Shortbed 4.5/6?" Frame off resto http://67-72chevytrucks.com/vboard/s...d.php?t=548136 1999 Toyota Tacoma 4x4

03-07-2011, 08:53 PM	#7
ppbr2001 Registered User Join Date: Mar 2010 Location: Hydro, OK Posts: 89	Re: New Carb Could it be the float level? I took the vacuum plug off to hook the gauge up and it idled smoother.

03-07-2011, 10:19 PM	#8
SeanPaintsFlames Registered User Join Date: Feb 2008 Location: Buford, Ga. Posts: 339	Re: New Carb The two screws are left bank-right bank. They need to be even. I would say turn them all the way in, then unscrew them 6 half turns each. __________________ My 68 cougar restomod build:HERE

03-09-2011, 01:21 AM	#10
ppbr2001 Registered User Join Date: Mar 2010 Location: Hydro, OK Posts: 89	Re: New Carb Can't find any vacuum leaks. maybe it ain't supposed to idle smooth!

03-09-2011, 03:34 AM	#11
gchemist BAD BOW-Silverado XST Join Date: May 2000 Location: Senior Member from Austin, TX Posts: 6,431	Re: New Carb If you have a vacuum leak, the gauge would tell you. Is the needle steady or moving? What are the RPMs at idle? Which tranny are you running? A 700R4 should have the angle correction bracket installed. http://www.centuryperformance.com/tu...e-spg-148.html __________________ Gerardo a.k.a. Mad Chemist Silverado XST videos

03-12-2011, 03:34 PM	#12
ppbr2001 Registered User Join Date: Mar 2010 Location: Hydro, OK Posts: 89	Re: New Carb it has the 700r4 bracket. vacuum gauge is a little jumpy. sprayed ether around fittings and no reaction. Did readjust float level and helped a little.

03-13-2011, 10:38 PM	#13
rayfinseats Registered User Join Date: Dec 2010 Location: sioux city, iowa Posts: 619	Re: New Carb GO TO Edelbrock.com. They have a bunch of tuning videos for their carbs. Very informative. http://www.edelbrock.com/automotive_...ech_vids.shtml Last edited by rayfinseats; 03-13-2011 at 10:41 PM.

03-17-2011, 04:51 PM	#14
ppbr2001 Registered User Join Date: Mar 2010 Location: Hydro, OK Posts: 89	Re: New Carb Anybody ever drill holes in the primary butterfies?

03-17-2011, 08:41 PM	#15
Goldfinger Registered User Join Date: May 2010 Location: laurel hill Fl Posts: 645	Re: New Carb How did you install the egr? mine was sucking air through the manifold and it ran super high and rough. If you need a block off for the egr take the spacer on the egr fill with jb weld bake at 400 for 30m and place gasket sealer on it __________________ 1985 C10 Custom Deluxe LWB 305/700r4 [ Goldfinger ] 1999 k3500 crew cab dually 6.5tdi/4l80e

03-18-2011, 03:34 PM	#16
ppbr2001 Registered User Join Date: Mar 2010 Location: Hydro, OK Posts: 89	Re: New Carb Will do. Thanx!!



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03-26-2011, 02:49 AM	#17
ppbr2001 Registered User Join Date: Mar 2010 Location: Hydro, OK Posts: 89	Re: New Carb Just blocked off the EGR valve and it idle as smooth as the top of my head!! Thanks for all the advice!!

03-26-2011, 02:57 PM	#18
gchemist BAD BOW-Silverado XST Join Date: May 2000 Location: Senior Member from Austin, TX Posts: 6,431	Re: New Carb Yea, I run mine without the EGR valve!! __________________ Gerardo a.k.a. Mad Chemist Silverado XST videos

03-26-2011, 05:30 PM	#19
oldblue1968chevy Grandpa in the rustmobile... Join Date: Nov 2008 Location: Spokane WA/Viola TN Posts: 11,422	Re: New Carb Whats the EGR tube lol __________________ John Goose-1968 C10 355,9.32-1CR, Vortec Heads ,262 voodoo, 3.73:1 3OTT (HS ride/beater/farm truck) http://67-72chevytrucks.com/vboard/s...d.php?t=317684 Grams 53-1953 Chevrolet Belair http://67-72chevytrucks.com/vboard/s...=1#post4327784 1969 Chevy C10 Shortbed 4.5/6?" Frame off resto http://67-72chevytrucks.com/vboard/s...d.php?t=548136 1999 Toyota Tacoma 4x4

03-30-2011, 11:53 AM	#20
Goldfinger Registered User Join Date: May 2010 Location: laurel hill Fl Posts: 645	Re: New Carb Glad it worked for you. The egr is just an obstruction anyway. __________________ 1985 C10 Custom Deluxe LWB 305/700r4 [ Goldfinger ] 1999 k3500 crew cab dually 6.5tdi/4l80e

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