Edelbrock problems??

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Oct 23, 2004 | 06:17 AM

Fleetwood

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Pro

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From: Perth,Western Australia,Australia

Edelbrock problems??

Just replaced my Q-jet(crappy idle,starting & running rich issues) with an Edelbrock 1406,& although the idle & response is much better,there is a couple of issues I have.
First the left side mixture screw has no effect screwed in or out,& second when cruising just off idle,there is a surge & hesitation until I either give it more gas or slow down to an idle.This is a remanufactured carb.Is there anyone who has had these problems or can give me some pointers.

Thanks Neil.

Oct 23, 2004 | 07:24 AM

Love My 72 and 77

Drifting

Joined: Jan 2002

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From: Chico Ca

Did you use an adapter plate? The 1406 is a square bore and the QJ is a spread bore. Did you buy a rebuilt carb from edelbrock or another vendor? I used a new 1903 on my 77 and it works perfectly.

Last edited by Love My 72 and 77; Oct 23, 2004 at 07:28 AM.

Oct 23, 2004 | 08:20 AM

Paul L

Team Owner

Joined: Aug 1999

Posts: 30,995

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From: Ontario

Neil,
The first key question has been posed: the 1406 is a square bore. I have one on my 1967. What intake are you mounting it on?

Oct 23, 2004 | 08:34 AM

Fleetwood

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From: Perth,Western Australia,Australia

Yes I used a spread bore to square bore adaptor,the type with the four holes,as opposed to the open plenum type.
I bought the carb off a vendor on ebay as a remanufactured carb,in appearance it looks brand new.Hopefully I have not made a big mistake here.

Neil.

Oct 23, 2004 | 09:17 PM

gdh

Le Mans Master

Joined: Jan 2000

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From: Canada

I bought a reman'd from Edelbrock 2 summers ago and it has been a joy. Just slapped it on straight out the the box, no more gas leaks like I had with the Holley, downside lost some hp over the Holley. Check the jets etc and clean it out, sometimes some dirt gets in there during packaging.

Oct 23, 2004 | 10:51 PM

AlwaysWave

Le Mans Master

Joined: Feb 1999

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From: Hoosier

Cruise-In III Veteran

Quote:

Originally Posted by gdh

Check the jets etc and clean it out, sometimes some dirt gets in there during packaging.

The Edelbrock is a great carb and easy to maintain. Take a little time and remove it. Blow out all the passage ways and make sure the floats are set to 7/16 off the air horn.

The fact that your idle screw does little makes me think of some dirt clogging. Remember to have both idle screws turned out the exact same amount.

Keep us posted on the results. Once that sucker is dialed in you'll be very happy with it.

Oct 24, 2004 | 01:43 AM

BigBlockk

Drifting

Joined: Sep 2004

Posts: 1,959

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From: North Bend Ohio

Hesitation and surge are signs of a lean condition. Check for obstruction in the idle/ off idle systems. You may also want to look at the power piston spring. It may be a little weak. It may not be allowing the main system to come on line soon enough.

BigBlockk

Later.....

Oct 24, 2004 | 03:17 AM

Fleetwood

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From: Perth,Western Australia,Australia

Thanks to all the replies,I have stripped the carb down since my original post,very simple to work on,blown out all the air passages with compressed air,rebuilt it,& put it back on the car,still the same problem exists.Could it be that one of the drilled passages has not been drilled through,would this coarse an off idle stumble?

Neil.