Page 1 of 2 12 LastLast
Results 1 to 10 of 11

Thread: Holley High Idle

  1. #1

    Holley High Idle

    just resently I got the new motor runnin in my car, 355 sbc in an 89 iroc. Its got a Holley 670 street avenger on it, electric chock, vac secondaries. Once the choke comes off itll idle at around 600rpm(stick car). However when I hit the gas the idle will go up to anywhere from 800-1200rpm. I noticed the throttle linkage isnt returning all the way. I adjusted the idle screw so far that its not even touching anymore. I can push on the linkage and the idle will go down to 600 but come back up once I let go. I figured the return spring was too weak so I bought a CSR throttle bracket with double return springs on it. I can get the idle to hold at 600 but the spriings are so tight I can barely press the gas pedal. The problem has to be somewhere else. Everything on the motor is new so I know the carb linkage isnt all gummed up or anything. Anyone got any ideas?
    Matt

  2. #2
    Senior Member RACING JUNKIE
    Join Date
    Jun 2003
    Location
    Hobbs, NM
    Posts
    842
    I'm just guessing but I'd say your butterflies maybe rubbing. I've fixed that by loosing the screws on the thottle shaft and then gently open and close the throttle until the butterflies are free, then retighen the screws.

  3. #3
    Senior Member RACING JUNKIE
    Join Date
    Sep 2007
    Posts
    4,143
    Quote Originally Posted by dparker
    I'm just guessing but I'd say your butterflies maybe rubbing. I've fixed that by loosing the screws on the thottle shaft and then gently open and close the throttle until the butterflies are free, then retighen the screws.

    X2..just don't take the screws all the way out they are smooged over on the ends to keep them from backing out.

    Also I would still adjust the speed screw back down until it at least touches.

  4. #4
    The screws on the throttle shaft are the ones that hold the butterflies in place. One for each butterfly? Just want to make sure Im picturing the correct ones.

  5. #5
    Senior Member EXPERT BUILDER
    Join Date
    Aug 2005
    Location
    Tell City, IN
    Posts
    356
    Also check the plastic cam on the throttle side it can cause a bind and this type of problem. Not sure what this cam is called but it has a flat screw and 2 or 3 adjustments...

  6. #6
    Senior Member RACING JUNKIE
    Join Date
    May 2006
    Posts
    2,044
    Quote Originally Posted by camaro430sut
    The screws on the throttle shaft are the ones that hold the butterflies in place. One for each butterfly? Just want to make sure Im picturing the correct ones.
    Nope there's two(2) screws for each butterfly, you'll have to remove the carb and then remove base plate to access them.
    Then just slighty loosen the screws per bore (4) then rotate the shaft a couple times to center the butterflies up and enure there is no binding and tigten them back down, recheck your work and put it back together.
    Hope this helps.
    Goodluck, Charles
    ***IN GOD WE TRUST***

  7. #7
    Senior Member DYNO OPERATOR
    Join Date
    Aug 2005
    Location
    Rifle Colorado
    Posts
    585
    Does it do the same thing with the throttle cable unhooked? The cable may be too short or need adjusted to let the throttle close completely.....

  8. #8
    Yup still does it with the cable off

  9. #9
    Senior Member RACING JUNKIE
    Join Date
    Jun 2003
    Location
    Hobbs, NM
    Posts
    842
    Quote Originally Posted by camaro430sut
    Yup still does it with the cable off
    Camaro430 have you adjusted the butterflies yet?

  10. #10
    Administrator RACING JUNKIE bjuice's Avatar
    Join Date
    Apr 2003
    Location
    Greenville s.c.
    Posts
    3,239
    i agree Butterflys or a snug trottle shaft thaat needa little working in

    take the carb off and look at it from all sides,over and under while you pull the blades open...you should be able to feel the drag while the carbs are in your hand...
    Bjuice..

    "I'M YOUR HUCKLEBERRY ! "


Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Email us - Support@RacingJunk.com
Call us - 866.326.9227
Copyright © 2005-2016 RacingJunk.com All Rights Reserved.

Designated trademarks and brands are the property of their respective owners. Use of this Web site constitutes acceptance of the RacingJunk.com
Terms of Use, Classifieds Disclaimer, Privacy Policy, and Cookie Policy