I did some research and I think my oil pressure sending unit is going out. Tell me what you think.

When the jeep is at idle the oil pressure guage shows 40, while driving it shows 80. Is this the fault of the sending unit? If so, where is it located so it can be replaced? Thanks.

Drew

 

See the lil booger that is by the top of the oil filter and to the left of the distributor cap.

That is your sender...

 

Thats normal , the oil pressure should raise as the engine RPM increases , what you are saying is exactly how mine runs and has for years, be happy you have good oil pressure. I have seen them much lower.

 

mine runs at 50psi and about 30 at idle........

 

I know the pressure should increase as the rpm increases, but at highway speeds with the rpm just above 2000 the oil pressure gauge is pegged out at 80, is that normal? i just never remember seeing do that.

 

Jease i remember when the oil pressure needle on my 89 xj was pointing at the bottom of my gauge haha thats when u got some real problems.

 

Chili, what yours is reading is exactly what mine reads for idle and highway rpm. It has happily read like this for 60K miles and 4 years of faithful service. I basically look for it to read around 40 at idle and to rise when I goose the skinney pedal or take it up to highway rpm. For the stock oil pressure gauge to say any less, would worry me or more, would be a plus.

 

mine runsabout 50 idle and 60 psi highway.

 

7-10psi per 1K rpms is normal.

 

Mine may run a little high because I use 10W-40 oil. I believe all XJs were recommended to run 10W-30 by the manufacturer.

 

Mine runs 50-60 highway speeds and idles around 30..

 

Hmmmm makes sense i just changed the oil yesterday and before the oil change with 10w30 my oil pressure @ idle was 20psi and highway it was about 40-45psi.....Now since i changed my oil Castrol 10w40 the pressure @ idle is now 40psi and around 60-65psi @ highway speeds.......

 

I got 40 @ idle and 60 after gassing it a bit, thats with 208,000...Tj

 

thats fine....and that guage isnt the END all either...you would have to put a mechanical guage on it.

 

My pressure is normally just south of 20 PSI, highway or idle.

From the sounds of what everyone else is running, this seems low.

Do I need to worry?