Oil pressure light

[SMLE]

I just installed a 4.0 into a '03 Disco 2 after my 4.6 died.


I have a mechanical oil pressure gauge hooked up to a fitting between the block and the oil filter that indicates I have around 50 PSI at idle and it goes up and down with RPM from there.


However, my oil pressure light is on most of the time. It goes off after about 30 seconds of run time, stays out for a while, then comes back on, goes out, flickers, just doesn't seem to consistently stay on or off...


Vehicle seems to run fine otherwise.


Any ideas?

 

[Buddy]

have you tried a new switch?

 

[Rockbeard]

that's a ton of oil pressure! a bit too much i think. you are checking it at the pressure switch port i assume. check the specs. and put a new switch on it too, cheap. but 50 psi! wow. Am i wrong guys? must be a damn good oil pump!

 

[ezzzzzzz]

From a cold start I'd expect to see higher pressure, 50psi?, I don't know but it may not be out of the ordinary. The quality and accuracy of the meter come into play too. Not having hooked up one up to any of my stock rovers yet I can't say what to expect but I'm getting ready to do so on my wife's '02 to isolate a light lifter tick at idle after a headgasket job.

 

[kk88rrc]

If you're showing 50psi & getting a flickering light then at least one of your sensors are bad. I think the light comes on below 7psi.

 

[jymmiejamz]

I think the light comes on below 7psi.

That sounds right to me.

My guess would be that you have a chaffed wire shorting to ground somewhere.

 

[rovercanus]

That sounds right to me.

My guess would be that you have a chaffed wire shorting to ground somewhere.

I had this on my 2000.

 

[kk88rrc]

Since we're taking oil pressure.... at what point does the pressure relief valve open and what is too high of pressure?

 

[SMLE]

I replaced the oil pressure switch, which fixed the idiot light problem.


It now extinguishes within a few seconds of engine start up.


My oil pressure meter is hooked up to a sandwich that is between the oil filter and the block.


It reads between 40 and 50 PSI, closer to 50,,, during initial startup idle and while the engine is under load. After the engine warms up, at idle, pressure drops down to around 10 or 15 PSI, but immediately goes back up the 40 to 50 range during normal driving.

 

[jymmiejamz]

That sounds normal to me.