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!!

Re: New Carb
 

did you mess with the air-fuel mixture screw?

Re: New Carb
 

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

Re: New Carb
 

Used an edelbrock 4 hole quad to square bore adapter.

Re: New Carb
 

Where's the air-fuel mixture screw?

Re: New Carb
 

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

Re: New Carb
 

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

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.

Re: New Carb
 

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

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

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.

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

Re: New Carb
 

+1

Re: New Carb
 

Anybody ever drill holes in the primary butterfies?

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

Re: New Carb
 

Will do. Thanx!!

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!!

Re: New Carb
 

Yea, I run mine without the EGR valve!!

Re: New Carb
 

Whats the EGR tube lol

Re: New Carb
 

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