1997 Grand Cherokee O2 sensor troubles
Picked up a very clean 97 GC. 198,000 miles runs great, 17 mpg, no running problems, doesn't even burn oil. Took it on a 1000 mile trip this past weekend, the muffler has been getting worse. When looking at it I noticed the O2 sensor in the cat had all taped up wires and they were broken, also a rot hole which made the O2 sensor fall out. When I got home I replaced the muffler and straight piped the cat, using a bung to install the sensor. After some searching I found vague wiring diagrams for the O2 sensor and jeeps cut harness. Soldered the connections and took out for a drive. Almost no power.... got back, disconnected battery for a minute, took for another drive, better but still a little sluggish. Figured some driving it might get better. Nope. Unhooked the O2 sensor and full power again. Never any CEL lights. So any suggestions as to what might be going on here? Thanks!