YJ 4.2 Hesitation when second barrel of Weber opens - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > YJ Jeep Wrangler Forum > YJ Tech Forum

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 03-26-2012, 08:30 AM   #1
Newb
 
Join Date: Feb 2011
Posts: 13
YJ 4.2 Hesitation when second barrel of Weber opens

I have what seems to be a unique issue.

89 Wrangler 4.2, nuttered, only emissions that remains is the vapor canister. Installed Weber 36 DGEV, new plugs/wires, new fuel filter and pump, coil and cap looks new from the PO. Installed Borla header, new intake (stock version) new catalytic converter, and muffler.

At idle the engine runs perfectly and seems to be timed near perfect. Under light acceleration it runs up to 3-4k rpm smoothly and the second barrel of the carburetor opens with no hesitation. Now same scenario but heavier acceleration and once the throttle reaches the point of opening the second barrel it falls flat on its face like it is getting no fuel and then will run up no fine after a second of the hesitation.

Any ideas? I've had no luck calling weber tech support, will continue calling to see if they think it is a jet issue or accelerator pump.

bdr3355 is offline   Quote Quick Reply
Old 03-26-2012, 08:59 AM   #2
Newb
 
Join Date: Feb 2011
Posts: 13
I should note that sometimes it backfires during this hesitation/bogging event, however if accelerating in a higher gear it doesn't backfire.

bdr3355 is offline   Quote Quick Reply
Old 03-26-2012, 09:52 AM   #3
BDK
Jeeper
 
BDK's Avatar
 
Join Date: Nov 2010
Location: Cedar
Posts: 553
I had a weber for over a year and had the same problems, also good luck with weber/redline customer support. I tried calling and leaving messages for almost a week and never heard squat.

Do you have a fuel regulator installed?
BDK is offline   Quote Quick Reply
Old 03-26-2012, 10:22 AM   #4
Newb
 
Join Date: Feb 2011
Posts: 13
I had the Mr.Gasket one installed for awhile and didn't notice a difference. Doesn't seem plausible that fuel pressure could be blamed based on how it boggs down and the return line style fuel filter should prevent over loading of fuel.
bdr3355 is offline   Quote Quick Reply
Old 03-26-2012, 10:37 AM   #5
BDK
Jeeper
 
BDK's Avatar
 
Join Date: Nov 2010
Location: Cedar
Posts: 553
With your fuel filter, is the return line at the 12 o'clock position?
BDK is offline   Quote Quick Reply
Old 03-26-2012, 10:51 AM   #6
Newb
 
Join Date: Feb 2011
Posts: 13
Yes
bdr3355 is offline   Quote Quick Reply
Old 03-26-2012, 10:52 AM   #7
Newb
 
Join Date: Feb 2011
Posts: 13
BDK, Did you test different Jet sizes when you had the Weber?
bdr3355 is offline   Quote Quick Reply
Old 03-26-2012, 11:06 AM   #8
BDK
Jeeper
 
BDK's Avatar
 
Join Date: Nov 2010
Location: Cedar
Posts: 553
I had the shop jet it, I would have to check my receipt, but I think they were 1.08 jets
BDK is offline   Quote Quick Reply
Old 03-26-2012, 11:40 AM   #9
Newb
 
Join Date: Feb 2011
Posts: 13
Did the Jets fix the hesitation?
bdr3355 is offline   Quote Quick Reply
Old 03-26-2012, 12:02 PM   #10
BDK
Jeeper
 
BDK's Avatar
 
Join Date: Nov 2010
Location: Cedar
Posts: 553
Quote:
Originally Posted by bdr3355 View Post
Did the Jets fix the hesitation?
No, I always had issues with the weber. Thats why its for sale right now on CL and a MC2150!
BDK is offline   Quote Quick Reply
Old 03-26-2012, 12:11 PM   #11
Newb
 
Join Date: Feb 2011
Posts: 13
Hmmmm... that isn't very reassuring. It seems like people have good luck with them, but reading up on this hesitation issue today has lead me to think otherwise.
bdr3355 is offline   Quote Quick Reply
Old 03-27-2012, 11:17 AM   #12
Newb
 
Join Date: Feb 2011
Posts: 13
I'm curious now, what carburetor did you find that worked correctly for your setup?
bdr3355 is offline   Quote Quick Reply
Old 03-27-2012, 12:44 PM   #13
BDK
Jeeper
 
BDK's Avatar
 
Join Date: Nov 2010
Location: Cedar
Posts: 553
Quote:
Originally Posted by bdr3355 View Post
I'm curious now, what carburetor did you find that worked correctly for your setup?
the 2150, its way easier to tune. I am going to do a MPI conversion this summer.

BDK is offline   Quote Quick Reply
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Jeep Wrangler Forum 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 Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
What I did to my YJ today 1990_YJ YJ General Discussion Forum 11631 12-17-2014 11:11 PM
95 YJ build 4 Banger OUT, 5.3L IN!!! AZ WRANGLER YJ Build Forum 228 07-26-2014 12:47 PM
'95 YJ Slow and Steady College Budget Build Sasquatch 4x4 YJ General Discussion Forum 68 10-14-2012 05:30 PM
Oil pressure when hot? B-wils-TJ TJ General Discussion Forum 6 03-26-2012 09:07 AM
Interior full of MOLD <-- :( KrzyMoke TJ General Discussion Forum 35 03-26-2012 12:59 AM



Download our Mobile App

» Network Links
»Jeep Parts
» Featured Product

All times are GMT -5. The time now is 12:38 PM.



Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC