weber idles fine then lopes - JeepForum.com

 
LinkBack Thread Tools
post #1 of 7 Old 05-14-2012, 09:42 AM Thread Starter
bluedaffy
Registered User
1989 YJ Wrangler 
 
Join Date: Oct 2011
Location: Stevens Point
Posts: 291
weber idles fine then lopes

So just like the title says, when I'm driving and I come to a stop light, wait to for an old lady to cross the street, etc. the Jeep idles very stable, the rpm gauge holds steady and the Jeep has a nice low shiver at about 500 rpms. It will idle great like this for probably about 15-20 seconds, then it starts to lope a bit. When it starts loping like this it doesn't ever die. Then I take off again, stop at the next stop light and the same (an idle that would make a mother proud and then 15 seconds later starts loping). It makes me think that it could be a float problem, because it idles fine and then the bowl somehow pushes more fuel through to the intake along with the idle jet fuel causing it to lope? I'm not sure. I have the fuel return line connected, and I think it's not clogged (i'm not sure how to test this).

Weber 32/36- (I have gone through the best lean idle adjustment many times)
Timing- either 8 or 10 BTDC, I can't remember off hand.
Vacuum advance is connected to manifold vacuum.

I read that the fuel return line is enough fuel pressure relief to the weber without having to get a pressure regulator, but I'd like to know what others think. Thanks!

bluedaffy is offline  
Sponsored Links
Advertisement
 
post #2 of 7 Old 05-14-2012, 03:42 PM Thread Starter
bluedaffy
Registered User
1989 YJ Wrangler 
 
Join Date: Oct 2011
Location: Stevens Point
Posts: 291
Bump
bluedaffy is offline  
post #3 of 7 Old 05-16-2012, 04:35 PM Thread Starter
bluedaffy
Registered User
1989 YJ Wrangler 
 
Join Date: Oct 2011
Location: Stevens Point
Posts: 291
Bump please
bluedaffy is offline  
post #4 of 7 Old 05-16-2012, 05:21 PM
jhay80
Registered User
1998 TJ Wrangler 
 
Join Date: Mar 2012
Location: Topeka
Posts: 67
Is it a automatic? If so does it do it in gear with the brake on or in park or both? If auto in gear, check the tranny fluid.
jhay80 is offline  
post #5 of 7 Old 05-16-2012, 06:03 PM Thread Starter
bluedaffy
Registered User
1989 YJ Wrangler 
 
Join Date: Oct 2011
Location: Stevens Point
Posts: 291
Thanks, but no it's a manual. It does it whether in gear with the clutch in or in neutral.
bluedaffy is offline  
post #6 of 7 Old 05-16-2012, 09:03 PM
jhay80
Registered User
1998 TJ Wrangler 
 
Join Date: Mar 2012
Location: Topeka
Posts: 67
Maybe check the wires on the electric choke. I wish I could be more help.
jhay80 is offline  
post #7 of 7 Old 05-17-2012, 07:43 AM Thread Starter
bluedaffy
Registered User
1989 YJ Wrangler 
 
Join Date: Oct 2011
Location: Stevens Point
Posts: 291
Thanks jhay80, I checked the choke and everything seems to be functioning properly.

I'm about 92.5% sure that this bouncing of the rpm needle at idle is due to fuel somehow getting past the float and into the intake. I've heard that if the pressure on the fuel pump is too high that it can force fuel past the float needle and continue to fill the bowl until overfill occurs. I have the fuel filter hooked up to the return line in the 12 o'clock position. I do not however have a viton needle and seat, I have the needle and seat and plastic float that came with the weber. Have others had to change to the viton needle to remedy anything like this in the past? I think it's overfill because when I'm backing out of my driveway there is a small downhill grade in the pavement where the street and driveway meet, and every time I'm pulling out (traveling backwards in neutral) the jeep dies when it gets tilted back.

Anyone have to switch to viton?
Anyone have any other ideas on what could be wrong with the carb or out of adjustment to allow excess fuel to make it past the drip into the manifold?

And just for some additional info- yes I have checked that the idle speed screw is not allowing any profession hole to be exposed.

Thanks
bluedaffy is offline  
Reply

Tags
idle , idles rough , weber

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the JeepForum.com 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 e-mail address for yourself.



Email Address:
OR

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.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Jeep Forums Replies Last Post
TJ Morning Start Fine, Idles Fine, Second start requires throttle to start s4ms0n TJ Wrangler Technical Forum 4 11-17-2011 08:03 PM
4.0 idles fine but can't handle load shortstuf YJ Wrangler Technical Forum 6 03-11-2010 03:51 PM
97 tj only has 55k but now hesistates at first but idles fine sumitup TJ Wrangler Technical Forum 2 06-17-2009 01:03 PM
87 idles fine but stalls on acceleration Lunchbox2011 YJ Wrangler Technical Forum 11 01-23-2009 09:50 AM
Idles fine...Won't accelerate! Help!? Hobbes YJ Wrangler Technical Forum 9 02-04-2002 07:29 PM

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 Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome