Engine Performance problem
1999 Jeep Wrangler 6 cyl Four Wheel Drive Manual 120000 miles
My 99 Jeep Wrangler backfires through the intake only when cold and only when accelerating. It has 120k miles on it. I had it tuned recently (first time) mainly because it had never been tuned and it was runnign rough hot or cold. The tune up made a huge difference, but now I get this back fire when cold. I assume it is a fuel mixture problem and probably not caused by the engine control chip, but possibly by the O2 sensor. Am I on the right track? What else could it be?
Tuesday, December 30th, 2008 AT 6:53 AM