P0137 Killing Mileage?
I have a 96 with the 4.0 with about 209k miles on it. The computer was kicking up error codes for the speed sensor, 02 sensor, and something else, for a while. But now it only shows p0137. The previous owner cut the catalytic convertor out and hand wired in an O2. the wires fell on the exhaust pipe and shorted out...killing the jeep entirely for a week until I figured it out. Anyway, I wired in an O2 sensor (off an F-350 because my neighbor owns a parts yard and was working on one and it was right there and free) and the Jeep got a lot better mileage...21 22 hwy with a light foot. Then i put on 31x10.5 Treadwright guard dogs and saw 16~7hwy. Right now though, I'm seeing 13-14 and have no power. Some days she runs like a raped ape but most she's hard to bring to speed, and I have to stomp the hell out of the gas to hold 65 in a headwind. This is getting ridiculous...anyone have any ideas? Whole ignition system except distributor itself is new...vacuum gauge shows good at intake (hot at idle). Oh, when accelerating or stomping it to hold speed on the highway, my air in the cab switches from whatever vent its set to and goes straight to defrost. I've read thats a fail safe for a lack of vacuum to hold the blend door in position or something to that effect...but vacuum shows good and steady at the intake port. My intake is a WJ intake, the swap was done by the previous owner...I've replaced the intake gasket because they didn't tighten the bolts correctly. hope someone can help...if I can't get power back out of this thing it'll have to go down the road. I hate pushing her so hard just to hold a whimpy 65. Also theres a whoosh whoosh whoosh whoosh sound from the exhaust at higher speeds under throttle. Doesn't sound like a miss but its a pronounced noise...restricted muffler?...the thing is only a few months old. thanks to anyone who reads all this, hahaha.