Acceleration problems under "load"... Help please - 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 04-01-2012, 05:13 PM   #1
Newb
 
Shtewy's Avatar
 
Join Date: Feb 2012
Location: I live in Candor, NY
Posts: 6
Question Acceleration problems under "load"... Help please

Hi. I'm new here, and I have an '88 Wrangler with a 4.2 6 cyl., Weber Carb. I bought it used about 2 months ago from a dealer and got taken. I had to put a new motor (marshall engine), new starter, fuel pump, alternator, radiator,thermostat and housing, cap, rotor, plugs,and wires and had to pick up a new/used intake manifold. The garage finally got it all changed and running. My problem is it runs fine on flat roads, gets up to speed fine if I'm not getting on it, but when I'm going up a hill or trying to accelerate quicker, it spits and sputters and runs rough and sometimes "pops" back thru the carb or exhaust... (I'm not sure which) I would like to improve it's performance so I'm not afraid to take a long trip through PA hills to visit my daughter. Any help is greatly appreciated. Thank-you

Shtewy is offline   Quote Quick Reply
Old 04-02-2012, 08:06 AM   #2
Jeeper
 
Beachcruiser's Avatar
 
Join Date: Feb 2012
Location: Raleigh, NC
Posts: 429
Makes a big difference where it is 'backfiring' from, as they indicate opposite problems, for the most part.

First priority is to check your ignition timing. It's very easy to set, but you do need a special tool to do so, a timing light. If none of your buddies has one & knows how to use it....you might want to post on your local 4X4 board & ask to borrow one.

Weber carbs tend to like a specific fuel pressure, too much & they run rich, which will cause your symtpoms & a backfire out the tailpipe. Especially if your timing is off. The solution is an inline fuel pressure regulator which can be had for about 25 bucks. Super simple install.

Tho not likely w/ a new fuel pump, you can also be getting too little fuel, which will cause a 'pop' thru the carb.

If you can, pull a spark plug. If the white insulator portion near the tip is darkbrown/black...then it's too much fuel, if it's white/blistered, then it's too little.

Beachcruiser is offline   Quote Quick Reply
Old 04-02-2012, 07:10 PM   #3
Newb
 
Shtewy's Avatar
 
Join Date: Feb 2012
Location: I live in Candor, NY
Posts: 6
Thanks Man! Will pull plugs out tomorrow and see what I'm looking at. The Garage set the timing and they had to advance it a little to get it to start without any problems. I'll check the timing again and see where I'm at also.
Shtewy is offline   Quote Quick Reply
Old 04-02-2012, 07:13 PM   #4
Newb
 
Shtewy's Avatar
 
Join Date: Feb 2012
Location: I live in Candor, NY
Posts: 6
I should say too, that the reason I'm not sure where the poppin' is coming from is because it sounds like from under the hood/down by my feet. The jeep has stock exhaust with the pump lines capped off and has been repaired before the Cat where it had broken.
Shtewy is offline   Quote Quick Reply
Old 05-20-2014, 12:12 PM   #5
Newb
 
Join Date: May 2014
Location: Houston
Posts: 1
I have a 91 jeep Comanche Eliminator truck straight 6 and i have popping from my carb and no power at first but slowly it starts coming back. i might be able to get it up to 35. if i put it to the floor it just pops and bog's down. It has just right at a hundred thousand miles on it. any ideas. thanks
ortizsrh 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:
If you do not want to register, fill this field only and the name will be used as user name for your post.
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
fuel injector problems on 95 wrangler .. Please help!!! rthirteen YJ Tech Forum 8 04-07-2012 07:56 AM
Help with soft top please!!! ptb TJ General Discussion Forum 6 04-02-2012 09:33 PM
transmission help nolanator TJ General Discussion Forum 3 04-01-2012 05:39 PM
Starting problem like twice a week...Need HELP staud11 TJ General Discussion Forum 0 04-01-2012 04:31 PM
Engine trouble!!!! isfiring and no Power!!!HELP!!!! Willy Spicolli JK General Discussion Forum 2 04-01-2012 04:01 PM



» Featured Product

All times are GMT -5. The time now is 04:47 AM.



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