Question about 1999 Jeep Wrangler

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98 jeep wrangler 4.0 acceleration problem

I own a 1998 Jeep wrangler with the inline six 4.0. Latley my jeep has started to have problems with acceleration. As soon as i leave the house to go for a ride it feels like the motor is being choked. The only wierd thing is that as soon as the engine is warm, the problem disappears.

I have already tried the spark plug coil, spark plugs, fuel injector cleaner, and i have checked the air filter. Im in over my head on this one, please help, its time to go four wheelin

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  • TN wheeler May 30, 2008

    My jeep has 130k on it.



    I appreciate the help, ill give it a shot this weekend and let you know how it goes.

  • TN wheeler May 30, 2008

    My jeep has 130k miles in it, hoping to get alot more.



    I really appreciate the help. Ill give it a shot this weekend and let ya know the verdict.

  • jeepsi Jun 26, 2008

    mine does the same it will hesite and backfire already done all the suggestions mention here

  • nelldiver
    nelldiver Mar 01, 2013

    Mine is doing the exact same thing now. Same model and year. What ended up being the problem? please help!!!

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There are various reasons that this could happen:

  1. Your throttle body needs completely cleaned and decarbed
  2. The Throttle Position Sensor, IAC might be dirty
  3. o2 sensors might need replacing.
How many miles does your vehicle have?

Posted on May 30, 2008

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1 Answer

I have a 98 TJ 2.5, does anyone know if it has another numbers in the chassi? (except the three plates inside the car) tnanks


hi no there is only the ones on the inside the layout should be like this for your one


1 Country of Origin 1 = United States 2 Make J = Jeep 3 Vehicle Type 4 = MPV 4 Gross Vehicle Weight Rating E = 3001-4000 lbs.
F = 4001-5000 lbs. 5 Vehicle Line Y = Wrangler 4×4 6 Series 1 = Sport
2 = SE
4 = Sahara 7 Body Style 9 = Open body 8 Engine P = 2.5L Unleaded Gasoline
S = 4.0L Unleaded Gasoline 9 Check Digit 0 through 9, or X 10 Model Year W = 1998 11 Assembly Plant P = Toledo #2 12-17 Vehicle Build Sequence Six Digit Number

incase the picture did not come out

1 Country of Origin 1 = United States
2 Make J = Jeep
3 Vehicle Type 4 = MPV
4 Gross Vehicle Weight Rating E = 3001-4000 lbs.
F = 4001-5000 lbs.
5 Vehicle Line Y = Wrangler 4×4
6 Series 1 = Sport
2 = SE
4 = Sahara
7 Body Style 9 = Open body
8 Engine P = 2.5L Unleaded Gasoline
S = 4.0L Unleaded Gasoline
9 Check Digit 0 through 9, or X
10 Model Year W = 1998
11 Assembly Plant P = Toledo #2
12-17 Vehicle Build Sequence Six Digit Number

hope this helps.

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How to replace exhaust manifold gasket 1989 jeep wrangler 4.2


I also have an '89 Wrangler with a 4.2 liter inline six. I'm afraid that the spark plugs aren't on the same side as the manifolds. Mine is being a pain in the *** for me. The intake is lining up fine but the exhaust is off by about 1/4 of an inch in the way of a bolt. Was hoping for some solutions, left disappointed.

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1 Answer

Need routing diagram for serpentine belt - '98 Jeep Wrangler, straight six with and without A/C


Click of the following direct, Free Link. It has several Serpentine Diagrams, including the one for your 1998 Jeep Wrangler 4.0L In-Line 6-Cylinders based upon your Engine Options (AC/No AC, Power Steering/No Power Steering, etc.).
The Link Page ALSO has the 2.5L In-Line 4-Cylinder Serpentine Belt Diagrams with their various engine options.
Included are the with AC / without AC Routing.

Let me know if this helped, or if you have additional information or questions. Feel Free to contact me at FixYa.com!
http://www.2carpros.com/car_repair_information/year/1998/make/jeep/model/wrangler/1998_jeep_wrangler_drive_belt_routing_diagram.htm

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1 Answer

1995 jeep wrangler, 2.5L, 5 speed. The problem


few possible problems come to mind but the first being leaking injectors

to confirm...
try pushing and holding the accelerator all the way to floor when you try to start for the first time in the morning

be prepared to release the accelerator if the vehicle starts

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I have a problem with my 1994 jeep wrangler se. It has an inline six, 4.0 high output motor. I did a partial tune up... Plugs, wires, cap, and rotor. It idles perfect but when I climb hills or step on...


Mate.If you have done what you said,I think it might be just a small engine timing problem.The plugs that are recommended are champion RC12LYC,gap 0.035 in, just make sure yours are compatible.and the gaps are correct.The only other thing it might be is a really dirty fuel filter or injector.Check the other things first.Hope this helps

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1 Answer

1998 jeep wrangler starting issues


Hi Dava224 i had the same problem with my 1989 CJ. when it was cold out i would pump the gas pedal 3-4 times before turning the ignition. it puts a small amount of fuel in the motor without stalling it out. it wont start as hard. another good idea is to keep some fuel stabalizer in the tank everytime you fill up. hope this helps

Jun 28, 2009 | 1998 Jeep Wrangler

1 Answer

95 jeep wrangler: gauge indicates 0 oil pressure


Wire on oil sending unit may have fallen off or sensor itself may have gone bad. Check both. If engine has no tapping noises, likely it's not a pressure problem.

Jun 07, 2009 | 1998 Jeep Wrangler

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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.

Oct 14, 2008 | 1995 Jeep Wrangler

1 Answer

1998 Jeep Wrangler Sport codes P0121 and P0122


did you check voltage to sensors if you need help with proedure, contact me, or you may try patrs houses on line in how to section.

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