1991 Jeep Wrangler Logo
Posted on Jan 04, 2010
Answered by a Fixya Expert

Trustworthy Expert Solutions

At Fixya.com, our trusted experts are meticulously vetted and possess extensive experience in their respective fields. Backed by a community of knowledgeable professionals, our platform ensures that the solutions provided are thoroughly researched and validated.

View Our Top Experts

I am having a problem with the 4x4 on my 91 jeep wrangler. It has a 4.0 liter strait 6. Whenever I shift it into 4x4, every 8 to 10 seconds I feel a thump as if is it is popping out then back into 4x4. Occasionally I can see the 4X4 light blink off when it thumps. I changed the shift motor on the front axle but there was no change. I don't know where I should look next. I have suspected a problem in the vacum hoses but most of the hoses are inside wire bundles making it a bit tricky to trace the lines. Any suggestions you have will be helpful. Thanks

Answer This Question

2 Answers

Anonymous

Level 1:

An expert who has achieved level 1.
New Friend:

An expert that has 1 follower.

  • Contributor 1 Answer
  • Posted on Jan 17, 2010
Anonymous
Contributor
Level 1:

An expert who has achieved level 1.
New Friend:

An expert that has 1 follower.

Joined: Jan 17, 2010
Answers
1
Questions
0
Helped
395
Points
2

You can take apart the CAD vacuum assembly on your front dana 30 and install a 1/2 inch bolt to lock the inner and outer stub shafts together. That will solve your problem. The vacuum actuated system sucks, to be kind. Or like this joyellowhors says and get an aftermarket one piece shaft.

joyellowhors

Level 2:

An expert who has achieved level 2 by getting 100 points
MVP:

An expert that got 5 achievements.
Sergeant:

An expert that has over 500 points.
Champion:

An expert who has answered 200 questions.

  • Expert 303 Answers
  • Posted on Jan 08, 2010
joyellowhors
Expert
Level 2:

An expert who has achieved level 2 by getting 100 points
MVP:

An expert that got 5 achievements.
Sergeant:

An expert that has over 500 points.
Champion:

An expert who has answered 200 questions.

Joined: Jan 12, 2009
Answers
303
Questions
1
Helped
124729
Points
669

Replace the 2 part axle with an after market single axle.

Ad

Add Your Answer

×

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1helpful
1answer

I have a 95 jeep wrangler the 4 wheel drive will not engage into 4 high or 4 low when you put the shiftter into the postion if feels like it goes in but does not engage and the light does not turn on...
My Wrangler had the same problem, it ended up being a vaccum leak on the front axle shift motor. It is located in the middle of the front passemger side axle tube.
Read full answer
Feb 22, 2010 • 1995 Jeep Wrangler
2helpful
1answer

I have a 1987 jeep wrangler and it will not shift into 4 wheel dr
The front axle connects 4wd by vacuum. check the vacuum hoses that run to the actuator. Pay close attention to the vacuum hoses running underneath the battery as battery acid can eat thru those hose easily. Good Luck.
Read full answer
Dec 27, 2009 • 1987 Jeep Wrangler
0helpful
1answer

How many quarts of oil does my 1999 jeep sahara 4.0 liter inline 6 take at oil change
auto zone or the dealer ship could tell you, start off with 4 quarts, and then go to 5 or 6 if needed just check the dipstick every time after 4 quarts. it should hold 5 to 6 quarts
Read full answer
Oct 04, 2009 • 1999 Jeep Wrangler
0helpful
1answer

Jeep 1997 Wrangler. Gear shifting very hard
synchronizers are going bad a used trans would be cheaper than a rebuild due to the labor involved
Read full answer
Aug 19, 2009 • 1997 Jeep Wrangler
0helpful
2answers

4 wheel drive doesnt work.
Has this Jeep been modified at all?
It sounds like the shifter cable was reinstalled backwards.
Specifically the 4-Low "Not Climbing Well". 4-Low should give you the best torque and hill climbing ability.
Do you feel any "Binding" in the steering wheel (difficult to turn)?
Remember a Jeep uses real driveshafts and differentials to give you 4WD - you cannot engage 4WD or 4-Low on dry hard surfaces. It needs a little bit of slip between the wheels for turns.
Check you're fluids too.
Read full answer
Jul 11, 2009 • 1992 Jeep Wrangler
0helpful
1answer

1998 Jeep wrangler s/spot stuck in 4 wheel drive
This sounds like the linkage could have fallen or broken off. Have someone move the 4wd shifter while you look under the vehicle.
Read full answer
Feb 06, 2009 • 1998 Jeep Wrangler
0helpful
1answer

Trouble shifting into 4 wheel drive
The lever is hooked up to a cable system that hooks into each type of drive. It could be that the wire hook end is missing the notch to engage in 4x4 and passes it instead. You can get easy access to it directly underneath the shifter under the jeep.
Read full answer
Jan 20, 2009 • 2004 Jeep Wrangler
0helpful
1answer

1995 Jeep Wrangler YJ
a right angle pipe coming out from the top of the valve cover with a rubber hose attached. if you it out, shank it! it should sound like a mabble inside of it.
Read full answer
Oct 14, 2008 • 1995 Jeep Wrangler
0helpful
2answers

2004 jeep wrangler 2.4 litre 4 cylinder
check the ground wirea at the dipstick tube,remove them all,and bend the ends of the wire,look for weak or broken wires, i bought several 4 cyl jeep that had problems at shift, fall on their face < after the engine settled back in to place,so wires made contact> just a thot. the ground wires are small the engine moves,when shifting.
Read full answer
Jul 29, 2008 • 2004 Jeep Wrangler
0helpful
1answer

99 jeep wrangler
get a 6 cylinder motor drop in this is best gas saver for most vehicles 4 cylinders dont have the ability to push all the weight of a vehicle but runs smoothly
6 cylinders are as i put in words are evenly balanced for everyday use and not gas guzzler either
Read full answer
May 16, 2008 • 1999 Jeep Wrangler
Not finding what you are looking for?

View Most Popular

1991 Wrangler

  • Cars & Trucks

Related Question

I have a 95 jeep wrangler the 4 wheel drive will not engage into 4 high or 4 low when you put the shiftter into the postion if feels like it goes in but does not engage and the light does not turn on...

  • 1995 Jeep Wrangler

Related Topics

405 views

Ask a Question

Usually answered in minutes!

Popular Questions

2002 jeep wrangler 6 cylinder:

2002 Jeep Wrangler

Why does check eng light come on and engine starts to sputter

1995 Jeep Wrangler

Poor gas mileage on my jeep liberty

2005 Jeep Wrangler

I Need to see the fuse box diagram for a 1991 jeep

1991 Jeep Wrangler

Heater blows cold air

2004 Jeep Wrangler

Check Out the Latest Top Trucks Report!
Check Out the Latest Top Trucks Report!

View all Fixya Reports

Top Jeep Experts

ZJ Limited
ZJ Limited

Level 3 Expert

17989 Answers

Thomas Perkins
Thomas Perkins

Level 3 Expert

15088 Answers

john h

Level 3 Expert

29494 Answers

Are you a Jeep Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...