My oil pressure light has started to come on at idle - I put in a new oil pump about 1000 miles ago and I have oil and the engine is not making a racket like it is starving for oil and the light goes off with just a bit of increased RPM's

You think it is likely a failing oil pressure sending switch ?

Thanks

 

How many miles are on your engine? What weight of oil do you use?

 

Is the Oil Pressure Switch OEM Silver & White? Or is it an aftermarket Black & Gold unit? The aftermarket units don't seem to report the proper low PSI. I've worked on a lot of LR's with oil lights flickering and a lot of them had aftermarket Oil Pressure Switches and once swapped over to an OEM unit no more flickering at idle.

 

Thanks - I will check my switch and report back - running 15-40 oil - will check the oil pressure at idle with a gauge soon as I can

UPDATE

Oil light now coming on and staying on even under acceleration but not coming on until the engine is at temp - stays off when engine is cold

 

I think I’d start troubleshooting by plumbing in an oil pressure gauge to see what the oil pressure actually is. Or trying another pressure switch.

 

of course will be checking the pressure before I install a new switch - but for $10 doesn't matter if old one is still good - just keep it for a backup

 

If you want to know about the new switch (or old), it can be tested with regulated air pressure. The switch should activate around 8 psi falling pressure, as I recall. Might be difficult to rig up the fittings, or simply press the rubber end of your blow gun onto the switch. Ohmmeter between metal switch body and the wiring terminal will indicate when it switches.

If the wire is faulting to ground will also cause the light to come on.

 

Thanks on the grounding

 

So I crawled underneath and the oil pressure switch doesn't appear to be leaking and is dry but of course that doesn't mean it isn't bad so I will replace when I do the oil pressure test - what I did discover is my transmission oil cooler line is leaking like a sieve where the rubber hose connects to the hardline in front of the oil pan - it appears to be spraying oil out all over the place as it is under pressure - I don't imagine that leak would have anything to do with the oil pressure light coming on ? ?

 

I’m pretty sure it has nothing to do with it.