1999 TJ
4.0
143k
I am looking for advice to solve a recurring problem with my oil pressure gauge in dash running at zero. The biggest problem with this is that the vehicle automatically fails emissions in Colorado since the check engine light is on.
The problem: Initially the oil pressure gauge in the dash showed at zero as I was driving home one day. Basically oil pressure would jump up if higher RPMs were achieved, so I drove it home at high RPMs and low gears to try and not cause damage. After a mile or two the gauge would then read at either zero or 80 (max guage reading) for no apparent reason. Another mile or so and the gauge just ran at zero from there on out. Engine sounds and runs great the whole time.
Research came up with switching the Oil Pressure Sending Unit to fix the problem. I purchased a factory unit from the dealer and swapped it out no problems. For a month or so this fixed the problem but then it returned and immediately oil pressure gauge in the dash shows zero all the time.
I warrantied the Oil Pressure Sending Unit at the dealer and got another. I put seafoam in the oil and ran the engine for 30ish miles. Then I pulled the Oil Pressure Sending Unit off the vehicle, turned the vehicle on and revved the engine one time in the hopes of cleaning out any gunk in the area of the unit. This shot oil everywhere so its not plugged up. I changed the oil/filter/sending unit and once again everything ran at my accustomed oil pressure reading in dash.
Today after 2 weeks or so of the oil gauge working I am once again reading zero oil pressure. Obviously the oil pressure sending unit is related to the problem as it temporarily solves it. But what is either causing the sending units to go bad and/or give my dash gauge a false reading?
Thanks for any help!
4.0
143k
I am looking for advice to solve a recurring problem with my oil pressure gauge in dash running at zero. The biggest problem with this is that the vehicle automatically fails emissions in Colorado since the check engine light is on.
The problem: Initially the oil pressure gauge in the dash showed at zero as I was driving home one day. Basically oil pressure would jump up if higher RPMs were achieved, so I drove it home at high RPMs and low gears to try and not cause damage. After a mile or two the gauge would then read at either zero or 80 (max guage reading) for no apparent reason. Another mile or so and the gauge just ran at zero from there on out. Engine sounds and runs great the whole time.
Research came up with switching the Oil Pressure Sending Unit to fix the problem. I purchased a factory unit from the dealer and swapped it out no problems. For a month or so this fixed the problem but then it returned and immediately oil pressure gauge in the dash shows zero all the time.
I warrantied the Oil Pressure Sending Unit at the dealer and got another. I put seafoam in the oil and ran the engine for 30ish miles. Then I pulled the Oil Pressure Sending Unit off the vehicle, turned the vehicle on and revved the engine one time in the hopes of cleaning out any gunk in the area of the unit. This shot oil everywhere so its not plugged up. I changed the oil/filter/sending unit and once again everything ran at my accustomed oil pressure reading in dash.
Today after 2 weeks or so of the oil gauge working I am once again reading zero oil pressure. Obviously the oil pressure sending unit is related to the problem as it temporarily solves it. But what is either causing the sending units to go bad and/or give my dash gauge a false reading?
Thanks for any help!
