Surge and stumble at cruise and low RPM - Vintage Mustang Forums
Vintage Mustang Forum
HomeForumGalleryClassifiedsAbout UsAdvertiseContact Us
» Auto Insurance
» Featured Product
Go Back   Vintage Mustang Forums > General Discussion > Vintage Mustang Forum
Vintage-Mustang.com is the premier Ford Mustang Forum on the internet. Registered Users do not see the above ads.
Reply
 
Thread Tools
Old 08-23-2005, 10:28 PM   #1 (permalink)
Senior Member
 
Join Date: Dec 2004
Location: Chicago, IL.
Posts: 284
Default

I took the electric choke off my holley 4160 series carb because its been really warm in chicago.... and I figured the removal of the assembly will aid in air flow.

Now, at low RPMS and at cruising speed I notice a surge and stumble. If I accelerate, it is fine, but if I keep a steady speed or let my foot off, there is a definate stumble/miss/surge.

I plugged the line coming out of the carb that goes to the choke, and that is the only thing that I can figure is causing it. Is this consistant to a vacuum leak? Its really late, and I want to have some ideas on where to look for when I dive into it tomorrow.

Thanks!
DJCarbine is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 08-23-2005, 11:49 PM   #2 (permalink)
wma
Junior Member
 
Join Date: Aug 2005
Location: Irrigon, Oregon
Posts: 9
Default

you may want to look at this http://www.ponycarburetors.com/defau...ors#holley4150
the holley 4160 had a history of this problem to to the fact it was to large for this engine (design Flaw)
__________________
Gary Moore
World Mustang Association
E-Mail Mustang1964_@hotmail.com
Web Page http://mustangdiamond.homestead.com

Personal Cars
  • Mustang 1965
  • Mustang 1985 Convertible Saleen
  • Mustang 1988 LX
  • Mustang 1998 Roush
  • Mustang 2004 Coupe
wma is offline   Reply With Quote Quick reply to this message
Old 08-23-2005, 11:51 PM   #3 (permalink)
Senior Member
 
Join Date: Dec 2004
Location: Chicago, IL.
Posts: 284
Default

The thing is, it ran flawlessly 2 days ago... so I doubt its related to the history of being too big
DJCarbine is offline   Reply With Quote Quick reply to this message
Old 08-24-2005, 08:13 AM   #4 (permalink)
Senior Member
 
mstngjoe's Avatar
 
Join Date: Jul 2000
Location: Oregon
Posts: 3,845
Default

Quote:
you may want to look at this http://www.ponycarburetors.com/defau...ors#holley4150
the holley 4160 had a history of this problem to to the fact it was to large for this engine (design Flaw)
#1...There's no mention of a 4160 Holley on the page you linked to. That is the carb in question here.

#2...The assertion that the Holley 4150 "is just too big" for the Boss and Shelby cars is complete sales b.s. in IMO.
Do the symtoms they list for the 4150 occur? Sure they do. But it's not because the carb is too big. It's because the carb needs rebuilding or is not properly tuned.
__________________
2007 HD Softail Custom
mstngjoe is offline   Reply With Quote Quick reply to this message
Old 08-24-2005, 08:19 AM   #5 (permalink)
Senior Member
 
mstngjoe's Avatar
 
Join Date: Jul 2000
Location: Oregon
Posts: 3,845
Default

Quote:
The thing is, it ran flawlessly 2 days ago... so I doubt its related to the history of being too big
Put it back the way it was before you had the problems. If the problem goes away you have your answer. If not, you've eliminated the possibility and you can go from there.

The symptoms you describe can sometimes be attributed to a lean condition.
__________________
2007 HD Softail Custom
mstngjoe is offline   Reply With Quote Quick reply to this message
Old 08-24-2005, 02:51 PM   #6 (permalink)
Senior Member
 
red1970mustang's Avatar
 
Join Date: Aug 2004
Location: Brandon, Florida
Posts: 695
Default

If you removed the choke and plugged the vacuum that normally pulls through the electric choke. Then you may just need to readjust the idle mixture.
red1970mustang is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Vintage Mustang Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools

Posting Rules
You may post new threads
You may 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 On
Trackbacks are On
Pingbacks are On
Refbacks are Off


Powered by vBadvanced CMPS v3.2.2

All times are GMT -4. The time now is 02:18 PM.


Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
SEO by vBSEO 3.3.2 ©2009, Crawlability, Inc.