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09-24-2013, 12:22 PM
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CC Member
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Join Date: Feb 2012
Location: Keller,
TX
Cobra Make, Engine: Lonestar Classics LS427. Self-built 408W, AFR 195 heads, Performer RPM Intake, Quick Fuel 750, 407rwhp, 479rwtq
Posts: 549
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Not Ranked
Edelbrock carb problems
I know this is a Holley sub-forum, but there isn't one for Edelbrock carbs...
My buddy has a 347 SBF stroker with a dual quad setup with two Edelbrock 500cfm mechanical secondary carbs ( I know, overcarb'd). They are setup with a progressive linkage - the rear carb with choke is the main carb. It hits about 20% before the front carb (no choke) starts opening. The secondaries on the primary carb start to open about 40% throttle... anyway, that's not the problem.
The problems is that when the car is cold - choke on for the main carb, it idles fine. Once the choke turns off, it idles fine at around 900rpm. However, once the car/carb gets hot after driving for a few minutes, the idle stays up at around 1500rpm. Blipping the throttle doesn't help. Pulling the pedal up does not help lower the idle back down. Putting a heavy spring on the primary carb resolves the issue but makes the throttle pedal hard to push and impossible to feather.
Any ideas? I'm thinking maybe a slightly bent throttle rod. When the carb heats up, it sticks a little. Any other ideas?
There is no rubbing of the linkage on the filters or intake.
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09-24-2013, 12:54 PM
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CC Member
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Join Date: Aug 2007
Location: Carlsbad,
Ca
Cobra Make, Engine: SPF 2932 with 438 Lykins Motorsports engine. Previous owner of FFR 5452.
Posts: 2,616
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Not Ranked
Not sure if this works on an Ed carb (or if they even have a baseplate) but when my Demon carb exhibited the same symptoms, I ended up replacing the entire base plate. Problem solved.
__________________
Jim
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09-24-2013, 04:14 PM
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CC Member
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Join Date: Dec 2004
Location: Yorba Linda,
CA
Cobra Make, Engine: FFR, V8, Manual Trans, Htr, Wipers, Radio Delete
Posts: 327
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Not Ranked
Sounds like it's not coming off the of the fast idle cam. Usually an easy screwdriver fix.
Frank
__________________
FFR - V8, Manual Trans, PS, Inop Wipers, No Radio, Gas Mileage so-so
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09-24-2013, 08:06 PM
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CC Member
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Join Date: Jun 2011
Location: San Antonio,
tx
Cobra Make, Engine: Fiberfab international classic cobra
Posts: 76
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Not Ranked
I have the twin eds on a 351w had very same problem. Its was the fast idle came. Had to back off scew and spray a little lube on the rod.
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09-26-2013, 07:09 AM
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CC Member
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Join Date: Feb 2012
Location: Keller,
TX
Cobra Make, Engine: Lonestar Classics LS427. Self-built 408W, AFR 195 heads, Performer RPM Intake, Quick Fuel 750, 407rwhp, 479rwtq
Posts: 549
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Not Ranked
Thanks guys. I will try the above.
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09-29-2013, 02:08 PM
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CC Member
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Join Date: May 2008
Location: Brisbane,
QLD
Cobra Make, Engine:
Posts: 2,797
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Not Ranked
The fast idle cams are "weighted" and could be binding on their pivots.
__________________
Gary
Gold Certified Holden Technician
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09-30-2013, 09:40 PM
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CC Member
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Join Date: Feb 2012
Location: Keller,
TX
Cobra Make, Engine: Lonestar Classics LS427. Self-built 408W, AFR 195 heads, Performer RPM Intake, Quick Fuel 750, 407rwhp, 479rwtq
Posts: 549
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Not Ranked
Quote:
Originally Posted by Gaz64
The fast idle cams are "weighted" and could be binding on their pivots.
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How do you go about checking to see if they are binding on their pivots? |
10-01-2013, 01:45 AM
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CC Member
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Join Date: May 2008
Location: Brisbane,
QLD
Cobra Make, Engine:
Posts: 2,797
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Not Ranked
Quote:
Originally Posted by Texasdoc
How do you go about checking to see if they are binding on their pivots?
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Disconnect the rod to the cam, the cam should be free to rotate on it's pivot.
__________________
Gary
Gold Certified Holden Technician
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