Question about 1990 Jeep Wrangler

1 Answer

1990 Jeep Wrangler Islander L6 4.2L

What is the correct timing for the Jeep? And what is the correct choke settings for it, too?

Posted by on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Master
  • 11,896 Answers

9 Degrees 1990 Jeep Wrangler Islander L6 4.2L - clearpixel.gif Application: With automatic transmission
With Federal emission
16 Degrees clearpixel.gif Application: With automatic transmission
With high altitude emission

9 Degrees 1990 Jeep Wrangler Islander L6 4.2L - clearpixel.gifg src="" alt="clearpixel.gif" class="h_mi" /> Application: With manual transmission
With Federal emission
9 1990 Jeep Wrangler Islander L6 4.2L - clearpixel.gifes clearpixel.gif Application: With manual transmission1990 Jeep Wrangler Islander L6 4.2L - clearpixel.gif With Federal emission


Posted on Jan 29, 2009

  • 1 more comment 
  • Nate Stansfield
    Nate Stansfield Jan 29, 2009

    Before top dead center
    *Set at warm idle speed (700 RPM)
    *Distributor vacuum hose disconnected & plugged
    *Transmission in neutral (parking brake engaged)
    *All accessories off

  • Nate Stansfield
    Nate Stansfield Jan 29, 2009

    To adjust the carburetor on the 4.2L engine, the carburetor choke
    and intake manifold heater must be off. This occurs when the engine
    coolant heats to approximately +160ºF (71ºC).

    Measure the distance between the air horn wall and the choke plate. If it is not 9/64 in. (3.6mm), bend the choke vacuum break to adjust the clearance.

    Choke Setting
    The automatic choke setting is made by
    loosening the choke cover in the desired direction as indicated by an
    arrow on the face of the cover. the original setting will be
    satisfactory for most driving conditions. However, if the engine
    stumbles or stalls on acceleration during warm-up, the choke may be set
    richer or leaner no more than two graduations from the original setting.

    With the throttle held fully open, apply pressure on the choke valve
    toward the closed position and measure the clearance between the lower
    edge of the choke valve and the air horn wall. The measurement should
    be 9/32 in. (7mm). Adjust by bending the tang on
    the throttle lever which contacts the fast idle cam. Bend toward the
    cam to increase the clearance.

  • Nate Stansfield
    Nate Stansfield Jan 29, 2009

    If you want more info, you can go to this link for FREE ONLINE SERVICE MANUAL for your jeep. (copy and paste in your address bar)


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


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



Related Questions:

1 Answer

My 89 jeep wrangler islander only drives in 4 Lo. If I put in 2 hi it clanks and I can hear the gears grind. First gear works decent but once you switch to second you can hear it grind again. What could my...

old dog , jeep, sure.
its a PART TIME 4wd, not AWD.
you post but forget (100s like this here) with no road surface stated.
dirt, ice, snow, off road, pavement. what??

my wild guess, is this car is new, to you,
and you never read the operators guide yet.
lost 25 years ago, but sold on fleabay
do not drive on pavement dry , or you WILL wind it up.
WHEN I SAY 4wd I MEAN , the front lockers are locked AND
the transfer case is in 4wd.

Here is the best page on the net for PT-4WD
here we go , WINDUP. 101

answer, is , DONT DO That.

Mar 31, 2014 | 1988 Jeep Wrangler

2 Answers

I have a 1990 yj my wiper motor sounds like it works but wipers dont move how do i fix this

How do I get to the windshield wiper motor on a 1990 Jeep Wrangler?

Nov 15, 2010 | 1990 Jeep Wrangler

1 Answer

I need a 1990 jeep wrangler 6 cylinder stock carburetor schematic and or diagram
I cannot guarantee the accuracy of this image. However you should be able to tell if it is correct. It should be very useful. Good luck!

Jun 28, 2010 | 1990 Jeep Wrangler

1 Answer

How to repair fuel injector and timeing chain

get a haynes manual at a discount place or search online

May 26, 2010 | 1990 Jeep Wrangler

1 Answer

Caster adjustment for 1990 jeep yj wrangler

caster is adjusted at the rear of the lower control arms. Camber is fixed and cannot be adjusted by normal means (though special off-set ball joints are available to do that) Toe in is adjusted by turning the sleeves in or out on the tie rod ends. None of this should be done at home though crude adjustments can be made in order to get the front end reasonably straight. Adjustments are made on an alignment machine that allows precise adjustments to all you mentioned as well as front/rear tracking.

Mar 12, 2010 | 1990 Jeep Wrangler

Not finding what you are looking for?
1990 Jeep Wrangler Logo

Related Topics:

1,171 people viewed this question

Ask a Question

Usually answered in minutes!

Top Jeep Experts


Level 3 Expert

70387 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22041 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

6880 Answers

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

Answer questions

Manuals & User Guides