Intermittent hesitation and backfire through the intake

Tiny
CRAIG TAYLOR
  • MEMBER
  • 1998 JEEP WRANGLER
  • 2.5L
  • 4 CYL
  • 4WD
  • MANUAL
  • 150,000 MILES
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.
Monday, March 19th, 2018 AT 3:36 PM

1 Reply

Tiny
HARRY P
  • MECHANIC
  • 2,292 POSTS
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?
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Tuesday, March 20th, 2018 AT 4:35 AM

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