Help with rough idle - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Wrangler Forums > YJ Wrangler Technical Forum > Help with rough idle

Year End Clearance Sale! Save 20%Warn, Smitybilt, Engo, Rugged Ridge Winches at CCORIntroducing MONSTALINER™ UV Permanent DIY Roll On Bed Line

Reply
Unread 04-02-2013, 03:07 PM   #1
akagrifty
Registered User
1989 YJ Wrangler 
 
Join Date: Nov 2012
Location: clementon, nj
Posts: 19
Help with rough idle

I have an 89 wrangler with a 4.2 that has a rough idle and at cold starts surges. This started after I replaced the distributor and spark plugs. I didn't replace the cap, rotor, or wires because they were replaced only 5000 miles ago. I checked all the vacuum lines which was not easy. I did the nutter bypass when I rebuilt the engine 5000 miles ago. The carb is brand new also replaced when the engine was rebuilt. I replaced the distributor because the vacuum advance was bad. The ignition module and capacitor were replaced just before the engine was rebuilt. Does anyone have any suggestions because I am out of ideas of what to check and I don't want to pay for something that I could easily check myself?

akagrifty is offline   Reply With Quote Quick reply to this message
Unread 04-02-2013, 03:24 PM   #2
Old4X
Registered User
1990 CJ7 
 
Join Date: Nov 2008
Location: Ga
Posts: 5,152
Add a dedicated ground to the black wire in the 3 wire bundle coming from the distributor.

Double and triple check your firing order. And change the plugs and wires one at a time to see if you have a bad one or damaged one while working with them.
__________________
418 miles on 19 gallons of gas. Can't beat the BBD !
Old4X is offline   Reply With Quote Quick reply to this message
Unread 04-02-2013, 04:21 PM   #3
akagrifty
Registered User
1989 YJ Wrangler 
 
Join Date: Nov 2012
Location: clementon, nj
Posts: 19
Yeah I forgot to say that i tried grounding out each plug to see if any one cylinder was getting the misfire but that didn't help at all i would get the 1 cylinder misfire along with the other intermittent misfires on all 6 cylinders. I will try the dedicated ground though thanks.
akagrifty is offline   Reply With Quote Quick reply to this message
Unread 04-02-2013, 04:54 PM   #4
Que89YJ
Web Wheeler
1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 15,707
If it is nuttered the you need to add the dedicated distributor ground Old 4x suggested.
Que89YJ is offline   Reply With Quote Quick reply to this message
Unread 04-02-2013, 05:11 PM   #5
akagrifty
Registered User
1989 YJ Wrangler 
 
Join Date: Nov 2012
Location: clementon, nj
Posts: 19
ok I added the ground wire and that did nothing. Let me make sure I understood what you meant. I took the black wire from the distributor cut it. Then I spliced those 2 wires with a new wire and ran the new wire to the ground side of the battery.
akagrifty is offline   Reply With Quote Quick reply to this message
Reply

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.
Note: All free e-mails have been banned due to mis-use. (Yahoo, Gmail, Hotmail, etc.)
Don't have a non-free e-mail address? Click here for a solution: Manual Account Creation
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






Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.