stonedv8
NAXJA Forum User
- Location
- Decatur, Al
I searched and found only one other with a similar year model, and his was throwing O2 sensor codes but he never posted again what may have fixed his issue.
This is/was my daily driver so I am hitching a ride with the wife until I can resolve this. Adds about 3 hrs to my schedule as she goes in to work earlier than I do.
Anyways, 2000 Jeep Cherokee 4WD 4.0 motor with about 130k on the odometer. Going home about 500 yds from my house the Jeep just started backfiring VERY loudly through the intake/throttle body. Can rev it up and the backfire goes away but it runs rough. Will crank and idle at normal rpm's except for the gunshot backfiring.
One code had popped and it was P0122 TPS, so I checked voltage going to it and it was 5v like book stated, so I replaced the TPS. No luck.
Cleaned TB by spraying cleaner in it while running, keeping it running and not letting it stall out. No luck.
Checked all the wiring, while running move wire harness.
Pulled Cam Position Sensor and smelled burned and since it felt like a timing issue I replaced the Cam Sensor. No luck
Had replaced plugs about 3 months ago with NGK's so those are fine. I pulled coil packs/rail and checked firing. The boots all fire fine.
Checked Fuel pressure at the rail, its reading 49psi at idle.
Checked for vacuum leaks by spraying the TB cleaner all around, no fluctuation in idle or revving.
After replacing both the previous sensors I have disconnected the positive terminal and touched it to the negative for 30 seconds and did the PCM reset steps.
I am at a loss, I have scoured the interwebs because I hate posting problems in the luck that there are others out with the same issues, but again from when I have found similar issues was on earlier XJ's that had distributors, as this one does not I have no luck.
This is/was my daily driver so I am hitching a ride with the wife until I can resolve this. Adds about 3 hrs to my schedule as she goes in to work earlier than I do.
Anyways, 2000 Jeep Cherokee 4WD 4.0 motor with about 130k on the odometer. Going home about 500 yds from my house the Jeep just started backfiring VERY loudly through the intake/throttle body. Can rev it up and the backfire goes away but it runs rough. Will crank and idle at normal rpm's except for the gunshot backfiring.
One code had popped and it was P0122 TPS, so I checked voltage going to it and it was 5v like book stated, so I replaced the TPS. No luck.
Cleaned TB by spraying cleaner in it while running, keeping it running and not letting it stall out. No luck.
Checked all the wiring, while running move wire harness.
Pulled Cam Position Sensor and smelled burned and since it felt like a timing issue I replaced the Cam Sensor. No luck
Had replaced plugs about 3 months ago with NGK's so those are fine. I pulled coil packs/rail and checked firing. The boots all fire fine.
Checked Fuel pressure at the rail, its reading 49psi at idle.
Checked for vacuum leaks by spraying the TB cleaner all around, no fluctuation in idle or revving.
After replacing both the previous sensors I have disconnected the positive terminal and touched it to the negative for 30 seconds and did the PCM reset steps.
I am at a loss, I have scoured the interwebs because I hate posting problems in the luck that there are others out with the same issues, but again from when I have found similar issues was on earlier XJ's that had distributors, as this one does not I have no luck.