2.5 Liter TJ engine running very bad, no power. First let me give you some background info. Please read...
I purchased this jeep last year. The guy did a lot of things to the jeep, and I really dont know what I have. the title says its a 97, but parts from the engine say its a 96. and there are like 4 different VIN #s on various body panels. Looks like I got a frankenstein.
what the jeep has as of right now. Dana 30/35, 488 gears, detroit locker in front welded rear, yukon shafts and super joints, 35"Boggers on bart wheels. stock fuel tank removed and replaced with fuel cell from summit, with after market pump. 2.5 4cyl
It ran kind of poorly and could only get up to 48mph, but the service engine light didnt come on so I just figured it was a typicall wimpy 4cyl thing.
What I have done in the past couple of days is removed dash and discovered the lights were removed from the gauges, this is why the service engine light was not coming on. I installed new gauges and read the service codes and it read 3 different codes. P0132 Oxygen sensor high voltage bank one sensor one. P0121 Throttle position sensor signal. P0551 Power steering switch.
I did an inspection under the jeep and saw that the front o2 sensor had 2 cut wires on it and that the rear 02 sensor was not even installed in the pipe, it was just tied up hanging out in the open. I replaced the front o2sensor with a new one, and installed the original one in the rear. went for a test drive and it seems like I had instantly gained a lot of power. I drove it for 20 minutes and was able to get up to 55mph. Then drove it back to parts store to check codes again. Even though it was running better it would still missfire on occasion, I it just seemed to me it should have better throttle response. I read for codes, and the only code that poped up was p0551power steering switch. I dont think this is why its running bad. So I left the parts store and on the way back home it started loosing a bunch of power, misfiring and then it died on me. no power, no nothin.
I finially got it started, and back to the shop. I went ahead and replaced the TPS even though it was not reading a bad code for it anymore. still no change. The jeep has awefull almost no throttle response past 1/4 throttle. and back fires and misfires runs worse now than it did before I started, but the service engine light is not on anymore. This doesn't make any sense. Any help from you jeepers would be much appreciated. Thank you