Club Cobra Keith Craft Motorsports  

Go Back   Club Cobra > Engine Building, Tuning, and Induction > Holley Tuning

Welcome to Club Cobra!  The World's largest non biased Shelby Cobra related site!

  •  » Representation from nearly all Cobra/Daytona/GT40 manufacturers
  •  » Help from all over the world for your questions
  •  » Build logs for you and all members
  •  » Blogs
  •  » Image Gallery
  •  » Many thousands of members and nearly 1 million posts! 

YES! I want to register an account for free right now!  p.s.: For registered members this ad will NOT show

MMG Superformance
Nevada Classics
MMG Superformance
Main Menu
Module Jump:
Nevada Classics
Nevada Classics
Advertise at CC
Banner Ad Rates
MMG Superformance
MMG Superformance
MMG Superformance
Keith Craft Racing
May 2021
S M T W T F S
            1
2 3 4 5 6 7 8
9 10 11 12 13 14 15
16 17 18 19 20 21 22
23 24 25 26 27 28 29
30 31          
  #1 (permalink)  
Old 12-27-2020, 01:10 PM
MaSnaka's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Feb 2006
Location: Thousand Oaks, CA
Cobra Make, Engine: Classic Roadster
Posts: 1,312
Not Ranked     
Default Carburetor trouble need help

I have noticed over the last several drives my car has been twitchy at acceleration. Not smooth on take offs. Not sputtering or hesitating or anything like that, but a little jerky. So I checked to see if the cable was sticking, r&r the pedal assembly and lubed with grease. I found no issues. Yesterday I took the Cobra out after it had been sitting for a few weeks. Before I left I had it idling in the driveway and found after a few minutes of warming up there was a rough spot when I would manually blip the throttle by hand. It's almost sticking like its binding until it breaks loose then its fine. So a quick fix I sprayed some WD at the pivot points inside and outside on the primary throttle plate shaft. Oh it smooths out nice. So I go for my drive and everything is great, but then it starts to really hang up. I have to tickle the pedal with my foot to get it to open and once it breaks free everything seems normal. Talk about jerky... This is an intermittent problem as this didn't happen every time but once is too much. Is it possible there is a bushing that wears out where the shaft goes through?? Now the engine is cool there is no sign of this. AED HO 750 which uses the Holly body 4150. Over 10 years old.

Thanks for any help.
John
Reply With Quote
Sponsored Links
Sponsored Links
  #2 (permalink)  
Old 12-27-2020, 02:08 PM
CC Member
Visit my Photo Gallery

 
Join Date: Jul 2009
Cobra Make, Engine:
Posts: 350
Not Ranked     
Default

Probably not your problem, but I find the gas pedal can often catch on the floor-mat.
Reply With Quote
  #3 (permalink)  
Old 12-27-2020, 02:56 PM
Jerry Clayton's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Jul 2005
Location: Bartlett, Ill
Cobra Make, Engine: Everett-Morrison LS1
Posts: 2,425
Not Ranked     
Default

CABLE????? possibly fraying/unraveling inside the housing------common problem with cables-------
Reply With Quote
  #4 (permalink)  
Old 12-27-2020, 05:09 PM
MaSnaka's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Feb 2006
Location: Thousand Oaks, CA
Cobra Make, Engine: Classic Roadster
Posts: 1,312
Not Ranked     
Default

I found the primary plates were sticking when closed all the way. Weird thing is if the engine was off they would not stick. When I start the engine they stick, and so on for about 20 cycles of starting and shutting down. If I turned the idle screw down half a turn to crack them open no problem, but when I'd loosed the screw they would close too far and stick. So I closed them all the way. Loosened the screws that hold the plates to the shaft and let the plates find a new happy place and then tightened the screws. No problems during a short 2 mile drive. Fingers crossed this fix is so simple. Time will tell soon. BTW no floor mat and no fraying of the cable.

John
Reply With Quote
  #5 (permalink)  
Old 12-27-2020, 11:10 PM
CC Member
Visit my Photo Gallery

 
Join Date: Jul 2003
Cobra Make, Engine: Unique Motorcars 289 USRRC, 1964 289 stroked to 331, toploader
Posts: 684
Not Ranked     
Default

Gotta love an easy fix, John! Glad it worked out well for you.
__________________

Paul

Unique Motorcars 289 USRRC
1964 289 5-bolt block
Toploader and 3.31 rear
Reply With Quote
Reply

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -7. The time now is 09:26 AM.


Powered by vBulletin® Version 3.8.0
Copyright ©2000 - 2021, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.6.0
The representations expressed are the representations and opinions of the clubcobra.com forum members and do not necessarily reflect the opinions and viewpoints of the site owners, moderators, Shelby American, any other replica manufacturer, Ford Motor Company. This website has been planned and developed by clubcobra.com and its forum members and should not be construed as being endorsed by Ford Motor Company, or Shelby American or any other manufacturer unless expressly noted by that entity. "Cobra" and the Cobra logo are registered trademarks for Ford Motor Co., Inc. clubcobra.com forum members agree not to post any copyrighted material unless the copyrighted material is owned by you. Although we do not and cannot review the messages posted and are not responsible for the content of any of these messages, we reserve the right to delete any message for any reason whatsoever. You remain solely responsible for the content of your messages, and you agree to indemnify and hold us harmless with respect to any claim based upon transmission of your message(s). Thank you for visiting clubcobra.com. For full policy documentation refer to the following link: CC Policy
Links monetized by VigLink