Question about 1990 Jeep Wrangler

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1990 jeep wrangler yj 4.2 runs rough after it warms up

Engine runs rough idling after it warms up

Posted by Anonymous on

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

mrgreenz
  • 962 Answers

SOURCE: 1990 jeep yj 2.5L idles over 2200 after engine warms up.

It may be a bad idle control valve. spray some brake cleaner or other fuel cleaning spray directly into the idle Control valve.it is located right inside where the air cleaner duct work is removed towards the fuel system This gets dirty and builds up gunk . making you car run bad. I hope this helps you. If it does, place a vote.

Posted on Dec 17, 2008

  • 5 Answers

SOURCE: 4wd problem jeep wrangler yj 1995

i just bought a used 97 CHEROKEE but i had the same problem, when i got to looking at it i found out the front driveshaft was shot, look at that, if its not it i would say its probably the transfer case especially with an older vehicle like that which is a very expenxive repair

Posted on Dec 21, 2008

  • 6 Answers

SOURCE: rough running when warm

Junk it *******

Posted on Apr 04, 2009

  • 6982 Answers

SOURCE: missing factory throttle linkages on 1990 YJ jeep. Need Diagram

Go to any scrapyard and you can get the entire setup for next to nothing...and you can see how it's hooked up!!!

Posted on Jul 07, 2009

  • 6982 Answers

SOURCE: 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.

Posted on Mar 12, 2010

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1 Answer

As to the 1990 Jeep YJ I asked about,engine is running, starts and idles fine. When you try to accelerate, acts sluggish until engine starts to warm up, then runs normal. Have changed the temp sensor.


Have you done a complete tune up ? To include replacing the fuel filter ? Are you the original owner of this Jeep ? If no, may have worn engine cylinders, piston rings, or bad valves. Many things could cause this problem.

Nov 18, 2016 | Jeep Cars & Trucks

1 Answer

I have a 92 yj 2.5l 5 speed. it has only after warming up a misfire/rough idle. its fine when its cold and once it warms up and idle comes down it misfires/idles really rough. may be lacking power also. i...


check that the EGR valve is not sticking or has a vacuum leak. This valve will not operate until the engine is warm.

check also the engine coolant temp sensor (ECT). This sensor tells the engine computer that the engine has warmed up, so if it is faulty, it could be sending wrong information to the computer. If the sensor is disconnected, wires to it broken, or faulty in full cold mode, it will tell the computer that the engine is very cold, like -40F. The computer will schedule fuel for cold conditions. This is usually way too much fuel for a warm engine and it will rich misfire, idle rough, and be difficult to start warm.

The ECT has two wires going to it and is dedicated to sending information to the engine computer. It has nothing to do with your dash gauge that shows coolant temp. That sender has only one wire and is dedicated to the coolant temp gauge.

Feb 21, 2011 | 1993 Jeep Wrangler

1 Answer

1990 Wrangler: I have a 1990 yj with the 4.2, my question for eve...


Most 90 wranglers from 89 to 95 have an ax15 5 speed transmission in them. The 4 cylinders had an ax5 transmission.

May 17, 2010 | 1990 Jeep Wrangler

1 Answer

Missing factory throttle linkages on 1990 YJ jeep. Need Diagram


Go to any scrapyard and you can get the entire setup for next to nothing...and you can see how it's hooked up!!!

Jul 07, 2009 | 1990 Jeep Wrangler

3 Answers

1990 Jeep YJ 6 cyc. Won't Start---No Spark From Coil


It would be great if you could find the Ignition Control Module!!! From my experience on my Jeep...90 YJ 4.2 liter carb. it does not have one...Computer controlled only...

May 17, 2009 | 1990 Jeep Wrangler

1 Answer

What type of transmission do i have?


Your Wrangler is a YJ and the model is an "S". A Wrangler manufactured in 1987 through 1995 are all YJ's and then from 1997 through 2006 are all TJ's. The new Wrangler models are dubbed JK's.

Feb 22, 2009 | 1990 Jeep Wrangler

1 Answer

1990 jeep yj 2.5L idles over 2200 after engine warms up.


It may be a bad idle control valve. spray some brake cleaner or other fuel cleaning spray directly into the idle Control valve.it is located right inside where the air cleaner duct work is removed towards the fuel system This gets dirty and builds up gunk . making you car run bad. I hope this helps you. If it does, place a vote.

Nov 17, 2008 | 1990 Jeep Wrangler

2 Answers

Doesnt want to idle under 1000rpm


it sounds like a tps problem-throttle position sensor

Nov 12, 2008 | 1990 Jeep Wrangler

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