intermittent hesitation and backfire through the intake

1998 JEEP WRANGLER
150,000 MILES • 2.5L • 4 CYL • 4WD • MANUAL
Avatar
CRAIG TAYLOR
  • MEMBER
  • 1 POST
I have been having issues with hesitation and backfiring through the intake from 1500 rpm through 2000 rpm's after that it runs fine. I have replaced the ECU, TPS, MAP sensor, intake temperature sensor and both o2 sensors. problem still there. ECU was programmed to my VIN number from flagship 1 out of New York. it is not a constant problem. intermittent.
Mar 19, 2018 at 3:36 PM
Advertisement
Avatar
HARRY P
  • ✓ASE Certified Mechanic
  • 2,292 POSTS
  • ASE Certified Mechanic
Have you ever done a tune up on it? If not, then do it. At 150,000, it needs to be done anyways. A bad plug wire or two could cause that intermittent backfiring (I have seen it). Also, is the service engine light on? If so, what are the code numbers?
Mar 20, 2018 at 4:35 AM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.