Oil pressure sensor?
 

I just bought a '99XJ Sport w/ 4.0L yesterday. It runs great, like new, but
I noticed this morning that when I start it the oil guage is pegged max up
to 80. it does go down when warm to about normal (30-60) but shoots up max
to 80 again when moving or reving the engine. My old '89XJ would run about
in the middle of the guage (40) as I'm sure it is supposed to? I'm sure it's
just a bad sensor? where is it located? I'm sure it's fairly easy to replace
myself, what is the proper ft/lb torque putting it back in? (or does it
matter?)

Re: Oil pressure sensor?
 

Sounds like you have a frayed wire that is allowing an occasional short
which pegs the gauge.

"Bishoff" <rwrede1@hotmail.com> wrote in message
news:y6rUf.492$WZ4.13@fe06.lga...
>I just bought a '99XJ Sport w/ 4.0L yesterday. It runs great, like new, but
>I noticed this morning that when I start it the oil guage is pegged max up
>to 80. it does go down when warm to about normal (30-60) but shoots up max
>to 80 again when moving or reving the engine. My old '89XJ would run about
>in the middle of the guage (40) as I'm sure it is supposed to? I'm sure
>it's just a bad sensor? where is it located? I'm sure it's fairly easy to
>replace myself, what is the proper ft/lb torque putting it back in? (or
>does it matter?)
>

Re: Oil pressure sensor?
 

Sounds like you have a frayed wire that is allowing an occasional short
which pegs the gauge.

"Bishoff" <rwrede1@hotmail.com> wrote in message
news:y6rUf.492$WZ4.13@fe06.lga...
>I just bought a '99XJ Sport w/ 4.0L yesterday. It runs great, like new, but
>I noticed this morning that when I start it the oil guage is pegged max up
>to 80. it does go down when warm to about normal (30-60) but shoots up max
>to 80 again when moving or reving the engine. My old '89XJ would run about
>in the middle of the guage (40) as I'm sure it is supposed to? I'm sure
>it's just a bad sensor? where is it located? I'm sure it's fairly easy to
>replace myself, what is the proper ft/lb torque putting it back in? (or
>does it matter?)
>

Re: Oil pressure sensor?
 

Sounds like you have a frayed wire that is allowing an occasional short
which pegs the gauge.

"Bishoff" <rwrede1@hotmail.com> wrote in message
news:y6rUf.492$WZ4.13@fe06.lga...
>I just bought a '99XJ Sport w/ 4.0L yesterday. It runs great, like new, but
>I noticed this morning that when I start it the oil guage is pegged max up
>to 80. it does go down when warm to about normal (30-60) but shoots up max
>to 80 again when moving or reving the engine. My old '89XJ would run about
>in the middle of the guage (40) as I'm sure it is supposed to? I'm sure
>it's just a bad sensor? where is it located? I'm sure it's fairly easy to
>replace myself, what is the proper ft/lb torque putting it back in? (or
>does it matter?)
>

Re: Oil pressure sensor?
 

Sounds like you have a frayed wire that is allowing an occasional short
which pegs the gauge.

"Bishoff" <rwrede1@hotmail.com> wrote in message
news:y6rUf.492$WZ4.13@fe06.lga...
>I just bought a '99XJ Sport w/ 4.0L yesterday. It runs great, like new, but
>I noticed this morning that when I start it the oil guage is pegged max up
>to 80. it does go down when warm to about normal (30-60) but shoots up max
>to 80 again when moving or reving the engine. My old '89XJ would run about
>in the middle of the guage (40) as I'm sure it is supposed to? I'm sure
>it's just a bad sensor? where is it located? I'm sure it's fairly easy to
>replace myself, what is the proper ft/lb torque putting it back in? (or
>does it matter?)
>

Re: Oil pressure sensor?
 

That would be normal on that engine used in an American Motors car:
http://www.----------.com/amchpchart.jpg So someone may have rebuilt it
using Real parts. Probably the best test is to buy an aftermarket gauge
from Stewart Warner or Autometer like the people that think the most of
their vehicles do, and compare.
The sending unit is located on the oil filter case:
http://members.cox.net/wilsond/Fixes...l-pressure.jpg
God Bless America, Bill O|||||||O
mailto:-------------------- http://www.----------.com/amchpchart.jpg

Bishoff wrote:
>
> I just bought a '99XJ Sport w/ 4.0L yesterday. It runs great, like new, but
> I noticed this morning that when I start it the oil guage is pegged max up
> to 80. it does go down when warm to about normal (30-60) but shoots up max
> to 80 again when moving or reving the engine. My old '89XJ would run about
> in the middle of the guage (40) as I'm sure it is supposed to? I'm sure it's
> just a bad sensor? where is it located? I'm sure it's fairly easy to replace
> myself, what is the proper ft/lb torque putting it back in? (or does it
> matter?)

Re: Oil pressure sensor?
 

That would be normal on that engine used in an American Motors car:
http://www.----------.com/amchpchart.jpg So someone may have rebuilt it
using Real parts. Probably the best test is to buy an aftermarket gauge
from Stewart Warner or Autometer like the people that think the most of
their vehicles do, and compare.
The sending unit is located on the oil filter case:
http://members.cox.net/wilsond/Fixes...l-pressure.jpg
God Bless America, Bill O|||||||O
mailto:-------------------- http://www.----------.com/amchpchart.jpg

Bishoff wrote:
>
> I just bought a '99XJ Sport w/ 4.0L yesterday. It runs great, like new, but
> I noticed this morning that when I start it the oil guage is pegged max up
> to 80. it does go down when warm to about normal (30-60) but shoots up max
> to 80 again when moving or reving the engine. My old '89XJ would run about
> in the middle of the guage (40) as I'm sure it is supposed to? I'm sure it's
> just a bad sensor? where is it located? I'm sure it's fairly easy to replace
> myself, what is the proper ft/lb torque putting it back in? (or does it
> matter?)

Re: Oil pressure sensor?
 

That would be normal on that engine used in an American Motors car:
http://www.----------.com/amchpchart.jpg So someone may have rebuilt it
using Real parts. Probably the best test is to buy an aftermarket gauge
from Stewart Warner or Autometer like the people that think the most of
their vehicles do, and compare.
The sending unit is located on the oil filter case:
http://members.cox.net/wilsond/Fixes...l-pressure.jpg
God Bless America, Bill O|||||||O
mailto:-------------------- http://www.----------.com/amchpchart.jpg

Bishoff wrote:
>
> I just bought a '99XJ Sport w/ 4.0L yesterday. It runs great, like new, but
> I noticed this morning that when I start it the oil guage is pegged max up
> to 80. it does go down when warm to about normal (30-60) but shoots up max
> to 80 again when moving or reving the engine. My old '89XJ would run about
> in the middle of the guage (40) as I'm sure it is supposed to? I'm sure it's
> just a bad sensor? where is it located? I'm sure it's fairly easy to replace
> myself, what is the proper ft/lb torque putting it back in? (or does it
> matter?)

Re: Oil pressure sensor?
 

That would be normal on that engine used in an American Motors car:
http://www.----------.com/amchpchart.jpg So someone may have rebuilt it
using Real parts. Probably the best test is to buy an aftermarket gauge
from Stewart Warner or Autometer like the people that think the most of
their vehicles do, and compare.
The sending unit is located on the oil filter case:
http://members.cox.net/wilsond/Fixes...l-pressure.jpg
God Bless America, Bill O|||||||O
mailto:-------------------- http://www.----------.com/amchpchart.jpg

Bishoff wrote:
>
> I just bought a '99XJ Sport w/ 4.0L yesterday. It runs great, like new, but
> I noticed this morning that when I start it the oil guage is pegged max up
> to 80. it does go down when warm to about normal (30-60) but shoots up max
> to 80 again when moving or reving the engine. My old '89XJ would run about
> in the middle of the guage (40) as I'm sure it is supposed to? I'm sure it's
> just a bad sensor? where is it located? I'm sure it's fairly easy to replace
> myself, what is the proper ft/lb torque putting it back in? (or does it
> matter?)

Re: Oil pressure sensor?
 

Bishoff did pass the time by typing:
> I just bought a '99XJ Sport w/ 4.0L yesterday. It runs great, like new, but
> I noticed this morning that when I start it the oil guage is pegged max up
> to 80. it does go down when warm to about normal (30-60) but shoots up max
> to 80 again when moving or reving the engine. My old '89XJ would run about
> in the middle of the guage (40) as I'm sure it is supposed to? I'm sure it's
> just a bad sensor? where is it located? I'm sure it's fairly easy to replace
> myself, what is the proper ft/lb torque putting it back in? (or does it
> matter?)

sensor or connector. 0 = short 80 = open
First thing I'd do is pull the connector, clean it
and reinstall.

http://revbeergoggles.com/Fixes/sensor-oil-pressure.jpg
If it's like the 93 4.0 yours is down on by the oil filter.

There is no real torque given for installation since you
can't get a torque wrench on it anyway. :) I just run it
down by hand then turn it in with a wrench till it feels
snug. If it leaks you just turn it in a bit more then
check later. A dab of sealant around the last few
threads helps.


--
DougW