# 98 Wrangler bucking

**URL:** <https://community.cartalk.com/t/98-wrangler-bucking/14713>\
**Category:** Maintenance/Repairs\
**Created:** [June 1, 2008, 4:07pm UTC](https://community.cartalk.com/t/98-wrangler-bucking/14713 "2008-06-01T16:07:58Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![njtech](https://avatars.discourse-cdn.com/v4/letter/n/65b543/32.png) [@njtech](https://community.cartalk.com/u/njtech)\
**Post date:** [June 1, 2008, 4:07pm UTC](https://community.cartalk.com/t/98-wrangler-bucking/14713/1 "2008-06-01T16:07:58Z")

</div>

My Jeep intermittently bucks while driving and in some cases idles rough. The dilemma  
  
 is the check engine light is not triggered for any faults making it difficult to locate the problem. Sometimes it misses  
  
 at idle either warm or cold but not bad enough to stall. However,  
  
 driving down the road it looses power completely for 5-10sec sometimes  
  
 popping though the throttle body and could be described as “bucking”.  
  
  
  
 A new crank sensor and fuel pump have been installed. It also  
  
 has new plugs cap and wires. All these problems are  
  
 very intermittent and it runs perfect otherwise. I have had days go by where it ran perfectly with  
  
 no issues. The shop were I had the fuel pump installed could not experience the problem  
  
 long enough to figure out.  
  
  
  
 I was going to try changing out parts … and wanted to  
  
 get some advise here. I was thinking about starting with the  
  
 MAP sensor… but if that where defective the check engine light  
  
 would be on right?.. so maybe try the coil and ignition module? I suppose _some_ ignition problems could be undetectable by the ECM?.. help!

---

<div class="post-metadata">

**Author:** ![njtech](https://avatars.discourse-cdn.com/v4/letter/n/65b543/32.png) [@njtech](https://community.cartalk.com/u/njtech)\
**Post date:** [June 1, 2008, 4:08pm UTC](https://community.cartalk.com/t/98-wrangler-bucking/14713/2 "2008-06-01T16:08:53Z")

</div>

oh its the 2.5 4cyl

---

<div class="post-metadata">

**Author:** ![Cougar](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/cougar/32/21348_2.png) [@Cougar](https://community.cartalk.com/u/Cougar)\
**Post date:** [June 1, 2008, 7:08pm UTC](https://community.cartalk.com/t/98-wrangler-bucking/14713/3 "2008-06-01T19:08:52Z")

</div>

Perhaps changing out the fuel pump relay will fix the trouble.