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-   -   '99 Oil Pressure Gauge (http://www.jeepgarage.org/f196/99-oil-pressure-gauge-31687.html)

mjonesjr 11-27-2011 04:16 PM

'99 Oil Pressure Gauge
 
When I turn the key to the on position in my '99 WJ, the oil pressure raises to about 20 PSI. That is before the engine is running.

Is that normal? If it isn't, how do I fix it?

2005JGC 11-27-2011 06:10 PM

Re: '99 Oil Pressure Gauge
 
I think with the WJ you can hold your odometer button in and turn the key on and it will to a cluster self test actuating all the lamps and sweeping all the gauges... if the oil pressure guage is functional with this test (not 100% sure it works on the WJ) then you may be looking at an oil pressure sender or circuit fault.

mjonesjr 11-27-2011 06:11 PM

Re: '99 Oil Pressure Gauge
 
Hmmm. I will have to do a little Googling on that cluster test.

01grand 11-27-2011 09:51 PM

Re: '99 Oil Pressure Gauge
 
My first guess would be the pressure sender, then the guage or circuit. Is it the 4.0L or the 4.7?

mjonesjr 11-27-2011 09:51 PM

Re: '99 Oil Pressure Gauge
 
It is the 4.0

01grand 11-27-2011 10:05 PM

Re: '99 Oil Pressure Gauge
 
Ok then I believe the pressure sender is right next to the oil filter, sticking out almost in your way when changing the filter. I broke mine when changing the filter on my old ZJ, the pressure guage would peg out for a few days until I replaced it. Very easy to do, one wire connector and unscrew it from the housing.

mjonesjr 11-27-2011 10:10 PM

Re: '99 Oil Pressure Gauge
 
I will pick one up tomorrow and change it. Hopefully that is it.

01grand 11-27-2011 10:13 PM

Re: '99 Oil Pressure Gauge
 
I hope it is, good luck let us know if it helps! Did you try the guage cluster test?

mjonesjr 11-28-2011 08:17 PM

Re: '99 Oil Pressure Gauge
 
What is the cluster test and how do you do it?

mjonesjr 11-28-2011 10:33 PM

Re: '99 Oil Pressure Gauge
 
Quote:

Originally Posted by 01grand (Post 522979)
I hope it is, good luck let us know if it helps! Did you try the guage cluster test?

Quote:

Originally Posted by mjonesjr (Post 523572)
What is the cluster test and how do you do it?

I did the instrument cluster test and everything went up and down like it should move.

I am going to swap the sending unit tomorrow and see how that works.

mjonesjr 11-29-2011 05:55 PM

Re: '99 Oil Pressure Gauge
 
I swapped out the oil pressure sensor and it fixed the problem. Glad it wasn't something more than the sender.

01grand 11-29-2011 09:08 PM

Glad to hear its fixed!


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