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Seasoned Member
Joined: Oct 2012
Posts: 444
Likes: 0
From: CA
Year: 1990
Model: Cherokee
Engine: 4.0L Inline 6
CF Veteran
Joined: Nov 2010
Posts: 15,581
Likes: 8
From: some small town oregon
Year: 1989
Model: Cherokee
Engine: 4.0
Seasoned Member
Joined: Oct 2012
Posts: 444
Likes: 0
From: CA
Year: 1990
Model: Cherokee
Engine: 4.0L Inline 6
Herp Derp Jerp

Joined: Nov 2011
Posts: 18,251
Likes: 17
From: Parham, ON
Year: 1999
Model: Cherokee
Engine: 4.0L OBD-II
hey guys i am looking for what my 97 fuel pressure should be at bc i am having been having some hard starts for a while and i just did a tune up and it is better but now i got a domestic code po138 and its says o2 senor or fuel pressure regulator. so i need to know what the pressure is suppose to be at or around so i can do my test later. thanks
If your 97 has the single feed into the fuel rail (pretty sure this is the case) it should be around 45 PSI.
CF Veteran
Joined: Sep 2009
Posts: 6,322
Likes: 6
From: Summerville, Ga
Year: 1995
Model: Cherokee
Engine: 2.5 4 cyl.
Herp Derp Jerp

Joined: Nov 2011
Posts: 18,251
Likes: 17
From: Parham, ON
Year: 1999
Model: Cherokee
Engine: 4.0L OBD-II
For the Rotella fans... 5W40 works just fine.
Herp Derp Jerp

Joined: Nov 2011
Posts: 18,251
Likes: 17
From: Parham, ON
Year: 1999
Model: Cherokee
Engine: 4.0L OBD-II
We just purchased a 2001 Grand Cherokee Laredo 6cyl in mint condition. Love the vehicle, but would love it more if the speedometer and odometer were in English units rather than Metric.
There's obviously more than an overlay to install since the odometer is digital. Has anyone done this or could you direct me to a source for the materials?
Thanks in Advance!
There's obviously more than an overlay to install since the odometer is digital. Has anyone done this or could you direct me to a source for the materials?
Thanks in Advance!
- Swap the entire gauge cluster from a US vehicle: Fixes everything but the odometer, which is actually built-in to the cluster itself, so you'll see the mileage from the donor all the time
- Install an overlay onto your current gauge cluster: If you look around here you'll see a few white ones, your odometer will be retained but obviously in kilometers instead of miles.
The US and Everywhere Else versions of the gauges work the same electrically and mechanically, it's just the paint and odometer that makes them different.
CF Veteran
Joined: Jul 2011
Posts: 1,411
Likes: 0
From: northlake IL
Year: 1997
Model: Cherokee
Engine: 4.0 I6
P0138 is "O2 Sensor High Voltage Bank 1, Sensor 2". This is the sensor downstream of the cat. It is not uncommon for the wiring to fall down and get chewed up by the drive shaft or by rodents. Check for damaged wiring causing a short - otherwise it is probably the sensor itself.
If your 97 has the single feed into the fuel rail (pretty sure this is the case) it should be around 45 PSI.
If your 97 has the single feed into the fuel rail (pretty sure this is the case) it should be around 45 PSI.
This is indicative of a dry start. Generally the first 10-15 seconds or so is the fault of a bad filter with failed anti-drain-back valve but if it lasts for a minute then it's too cold for the oil you're using. I saw in another post you run 10W30... you haven't mentioned your location but if it's "cold as crap" you should have 5W30 or 0W30 in there.
For the Rotella fans... 5W40 works just fine.
Senior Member
Joined: Aug 2012
Posts: 583
Likes: 0
From: Clear Lake, TX
Year: 1999 Jeep Cherokee
Model: Cherokee
Engine: 4.0
Power door lock help needed.
After the salt bath, my door locks quit working. I have since removed two bad actuators, front passenger and rear hatch, and tested all actuators with a 12v source and they are working. With everything put back in and wired up, I get nothing when I push the door lock/unlock. Windows and power mirrors work fine.
I have checked all of the fuses none of which were blown. I read that the whole power door lock system is controlled by the passenger front control panel on the door panel. There are two relays in the door switch panel.
Is there anyway to test this panel to see if that is my problem?
After the salt bath, my door locks quit working. I have since removed two bad actuators, front passenger and rear hatch, and tested all actuators with a 12v source and they are working. With everything put back in and wired up, I get nothing when I push the door lock/unlock. Windows and power mirrors work fine.
I have checked all of the fuses none of which were blown. I read that the whole power door lock system is controlled by the passenger front control panel on the door panel. There are two relays in the door switch panel.
Is there anyway to test this panel to see if that is my problem?




