alexgalexg
NAXJA Forum User
- Location
- Connecticut
1998 XJ, 4.0, auto, lifted
A few months back I parked my XJ in storage because it had a very plugged catalytic converter, tailpipe and muffler were on their way out as well, AND it did not always read fuel. So over the weekend I installed a new cat, new flowmaster, tail pipe, o2 sensor (downstream), dropped the tank, ground out any surface rust, painted above the tank and installed a new fuel pump (delphi).
The XJ runs the best it has in a long time, runs like new! I drove it around for the remainder of the weekend before making the 2 hour drive back home last night. On my way home last night I was accelerating up a hill and suddenly it started to loose power. I then heard a couple pops (sounded like in the intake or manifolds) and then all the power came back and I did not have another issue. It did this on occasion just before I parked it due to the cat, I assumed this was the issue. I also think my MPG went down a bit. Going through nearly half a tank in 2 hours seems a bit much. The problem did not repeat itself for the remainder of the drive. Highway speeds around 75 when not in bumper to bumper traffic and it ran as it was supposed to. Also, no codes thrown.
It has had a tune up less than 4k ago. Today I am going to pull the plugs and see what those tell me for starters. Anyone have any tips as to what else to check? I have a feeling this is going to turn out to be a sensor issue :looney:
Thank you in advance for any input.
A few months back I parked my XJ in storage because it had a very plugged catalytic converter, tailpipe and muffler were on their way out as well, AND it did not always read fuel. So over the weekend I installed a new cat, new flowmaster, tail pipe, o2 sensor (downstream), dropped the tank, ground out any surface rust, painted above the tank and installed a new fuel pump (delphi).
The XJ runs the best it has in a long time, runs like new! I drove it around for the remainder of the weekend before making the 2 hour drive back home last night. On my way home last night I was accelerating up a hill and suddenly it started to loose power. I then heard a couple pops (sounded like in the intake or manifolds) and then all the power came back and I did not have another issue. It did this on occasion just before I parked it due to the cat, I assumed this was the issue. I also think my MPG went down a bit. Going through nearly half a tank in 2 hours seems a bit much. The problem did not repeat itself for the remainder of the drive. Highway speeds around 75 when not in bumper to bumper traffic and it ran as it was supposed to. Also, no codes thrown.
It has had a tune up less than 4k ago. Today I am going to pull the plugs and see what those tell me for starters. Anyone have any tips as to what else to check? I have a feeling this is going to turn out to be a sensor issue :looney:
Thank you in advance for any input.