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10/11/15 3:38pm - Original Message: 'Holley carb won't idle any lower than 900 rpm'
F4Gary Gold Member
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Grapevine, TX - USA

Vette(s):
1972 LT-1 convertible with factory air.

Joined: 8/26/2006
Posts: 869
Was tinkering with the idle adjustments the other day.  Set the idle mixture screws at best idle, and then played with the idle speed stop.  I can completely remove the idle set screw and the car just sits there at 900 rpm.  Should I back out the little, hard to get to set screw that holds the back butterflies slightly open?  Have I said lately how much I hate my Holley carb?

The idle stop solenoid is not energized when I'm doing this.  It is wired to the compressor engage switch.
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10/12/15 10:09am - Reply: 'Re: Holley carb won't idle any lower than 900 rpm'
kstyer Lifetime Member
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CUYAHOGA FALLS, OH - USA

Vette(s):
1975 C3 Red, T-Tops, Black Interior. All I need is time and money! Getting there!

Joined: 12/2/2003
Posts: 6410
Check  the opening of the secondary throttle plates.  The 4 barrel section may be open a tad.

____________________________________
On the "Tail of the Dragon"
(some day, no strike that, October 2008 it turned red, still in progress!)

(click either image to see a bigger version)
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10/12/15 5:35pm - Reply: 'Re: Holley carb won't idle any lower than 900 rpm'
F4Gary Gold Member
Gold Member
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Grapevine, TX - USA

Vette(s):
1972 LT-1 convertible with factory air.

Joined: 8/26/2006
Posts: 869
OK, I backed off the back barrel set screw and now I can get it down below 800 rpm.  Not sure if Holley would like that solution, but it worked.  Holley says that screw should be backed out 1/2 a turn after it contacts the back barrel stops.Don't know where it is now in relation to that.

I was also able to turn the idle mixture screws in about 1/2 to 1 turn for best idle.

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 Forums -> C3 Fuel, Emission Control, and Exhaust Systems
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