New Holley Carb Won't Idle Down Enough! - Team Camaro Tech
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Old Jun 8th, 07, 12:04 PM
bdzee bdzee is offline
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Join Date: Feb 2003
Posts: 336
Angry New Holley Carb Won't Idle Down Enough!

Just installed a 570 holley street avenger on my 68 327 engine and I could not get the idle down enough so I had to retard the timing down to 4 degrees to get the idle right. I had it previously set at around 10 to 12. Because of this the car is running a little hot and has a slight stumble when I first accelerate. The throttle plates are not sticking and no matter how far down I push the throttles to close and with the screw all the way out it would not idle down unless I turned the dizzy. Any suggestions?
68 convertible 327 Ralley Green, White top, Deluxe Ivory interior, powerglide with white bumblebee stripe
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Old Jun 8th, 07, 12:18 PM
DjD's Avatar
DjD DjD is offline

Join Date: Apr 1999
Location: San Jose, CA
Posts: 25,758
Default Re: New Holley Carb Won't Idle Down Enough!

Pull the carb and check the secondary throttle blades... Back the screw out until it isn't seated, then take out any clearence and tighten it about 1/4 turn.

Before that thought, it just came to me that my Avenger's fast idle was set too high. It adjusts under the choke area. Check the instructions, if I remember they say to turn it the wrong way in them...

"Don't take life so serious, you won't get out alive..."
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Old Jun 8th, 07, 12:56 PM
Steptoe Steptoe is offline
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Join Date: Dec 2005
Location: New Zealand
Posts: 13,259
Default Re: New Holley Carb Won't Idle Down Enough!

Pull the carb and check the secondary throttle blades
If u get a rivet, hammer the end flat and square off, and put a 90 deg bend in a small screw driver...
u can get at the sec adjustment screw, thats on the opposite side to the trottle, under the bottom edge of the carb....close it up (unscrew) till u get adjustment with the main idle stop screw and mixture screws.
Do not adjust so the sec are fully closed...when its like this the butterflys are hard ahainst the carb bores, this can cause jambing and sticking.
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