4 th Gear sputtering - JeepForum.com
 
LinkBack Thread Tools
post #1 of 7 Old 05-01-2013, 10:01 PM Thread Starter
booboowv77
Registered User
1989 YJ Wrangler 
 
Join Date: Oct 2011
Location: Hedgesville
Posts: 301
4 th Gear sputtering

Ok I have an 89,4.2, MC2100, 5 speed, hei distributor, SOA w/ 4.10 gears. The problem is when I shift into 4 th gear the motor seems to start sputtering although it is at 2000 rpms after shifting which is the same rpms as the other gears after shifting. Does anybody have any ideas what to check?
I have adjusted the timing from 10-14 BTDC and have adjusted the fuel mix to max vacuum and then some with no real changes. It's not the clutch because the motor just seem to be sputtering. I have also adjusted the vacuum advance which is run straight off the manifold. The only other thing I can think of is maybe the jets in the carb need to be changed. what do you guys think?


GOOGLE IS YOUR FRIEND!!!
Just my toy!
89 YJ, Fresh 4.0, ax15, SOA w/410's, and about a million other things! :)
Built not Bought #759
booboowv77 is offline  
Sponsored Links
Advertisement
 
post #2 of 7 Old 05-02-2013, 06:33 AM
Fenix85182
Registered User
 
Fenix85182's Avatar
2005 TJ Wrangler 
 
Join Date: Jan 2006
Location: Southeastern CT
Posts: 603
It's only in 4th gear at 2,000 RPM? Does it do it at any other gear at the same RPM? Does it stop if you rev over 2,000 RPM in 4th gear?

I'd assume a fuel delivery issue, but if it only happens in 4th gear, I'm not sure. Maybe you only actually notice it in 4th gear?

2005 Jeep Wrangler TJ Sport
2009 Honda Accord EX
2008 Honda CBR600RR Graffiti Edition
Fenix85182 is offline  
post #3 of 7 Old 05-02-2013, 07:16 AM
Siva283
Registered User
1995 YJ Wrangler 
 
Join Date: May 2011
Location: Falling Waters
Posts: 3,742
That just doesnt make sense. Are you sure it doesnt do it in other gears just less noticably?

1995 YJ. 2 inch BDS Spring lift. 1 inch shackle lift. 1.25 inch JKS Body Lift 33x12.5x15's. Engo 10,000 pound winch.

Quote:
Originally Posted by Magnum View Post
I gave the Jeep the required offering of $$, sweat, and blood, and everything works fine now. -- Jim
Quote:
Originally Posted by ldso View Post
. It started with a $200 axle, and a few thousand dollars later I was done :)
Quote:
Originally Posted by Luuca View Post
diagnose the real issue before you start going all Obama on it - spending mad cash you'll need for other important things.

Ask me how I know...
Quote:
Originally Posted by Overhead View Post
this is also my second set of RC springs this year. I'd rather spend the money again and get something that will last.
Siva283 is offline  
post #4 of 7 Old 05-02-2013, 10:18 AM Thread Starter
booboowv77
Registered User
1989 YJ Wrangler 
 
Join Date: Oct 2011
Location: Hedgesville
Posts: 301
Quote:
Originally Posted by Siva283 View Post
That just doesnt make sense. Are you sure it doesnt do it in other gears just less noticably?
It may be doing it slightly in 3rd but first and second really seem fine. it does seem to even out when it hits 2500+ rpms or so.

GOOGLE IS YOUR FRIEND!!!
Just my toy!
89 YJ, Fresh 4.0, ax15, SOA w/410's, and about a million other things! :)
Built not Bought #759
booboowv77 is offline  
post #5 of 7 Old 05-02-2013, 10:59 AM
Siva283
Registered User
1995 YJ Wrangler 
 
Join Date: May 2011
Location: Falling Waters
Posts: 3,742
When is the last time you did a tune up. Whats the condition of the spark plugs?

1995 YJ. 2 inch BDS Spring lift. 1 inch shackle lift. 1.25 inch JKS Body Lift 33x12.5x15's. Engo 10,000 pound winch.

Quote:
Originally Posted by Magnum View Post
I gave the Jeep the required offering of $$, sweat, and blood, and everything works fine now. -- Jim
Quote:
Originally Posted by ldso View Post
. It started with a $200 axle, and a few thousand dollars later I was done :)
Quote:
Originally Posted by Luuca View Post
diagnose the real issue before you start going all Obama on it - spending mad cash you'll need for other important things.

Ask me how I know...
Quote:
Originally Posted by Overhead View Post
this is also my second set of RC springs this year. I'd rather spend the money again and get something that will last.
Siva283 is offline  
post #6 of 7 Old 05-02-2013, 01:54 PM Thread Starter
booboowv77
Registered User
1989 YJ Wrangler 
 
Join Date: Oct 2011
Location: Hedgesville
Posts: 301
Quote:
Originally Posted by Siva283 View Post
When is the last time you did a tune up. Whats the condition of the spark plugs?
Just did the HEI swap in the fall with cap, rotor, wires, plugs are still perfect.

GOOGLE IS YOUR FRIEND!!!
Just my toy!
89 YJ, Fresh 4.0, ax15, SOA w/410's, and about a million other things! :)
Built not Bought #759
booboowv77 is offline  
post #7 of 7 Old 05-02-2013, 05:26 PM
Fenix85182
Registered User
 
Fenix85182's Avatar
2005 TJ Wrangler 
 
Join Date: Jan 2006
Location: Southeastern CT
Posts: 603
Maybe it's less about the RPM and more about the throttle position? Could it be that around 2,000 RPMs you happen to be hitting the gas harder in 4th gear than in other gears?

I haven't worked on a carburetor in these Jeeps in years now, but I would think a clogged fuel filter, clogged jet, or incorrect ignition timing could be the problem.

2005 Jeep Wrangler TJ Sport
2009 Honda Accord EX
2008 Honda CBR600RR Graffiti Edition
Fenix85182 is offline  
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.



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



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