Vr- oil light

Engine being full of oil really has little to do with oil light unless it's very low....I'd replace the oil pressure switch which is not expensive and also check the wiring around the switch to see if it's shorting out.

 

how old is the oil? (by age i'm refering how many km's or months old the oil is.)
How thin is the oil?
How many km's on the motor?
Does the oil smell like petrol?
These questions need to be answered, as well as checking the oil pressure with a mechanical guage if possible to get a reasonable answer.

 

My oil light started coming on at idle, would go away with some rpm but I let it go for a week before I investigated it and now the motor has a severe knock, sounds terminal like a piston pin.
Not having pulled the motor down I can safely say it starved for oil, whether this was caused by a blocked or cracked pick up I can not tell you, the car was serviced well tho, no problems with the oil.

 

that sounds like the same problem that happen to my old motor i would advise you not to drive it till you get the problem fix cause mine shredded the bearings

 

this is without a doubt just a faulty oil pressure switch. change it. There is NOTHING wrong with your oil pressure.

The faulty switch is stopping your fuel pump from priming, to prevent damage to the engine by starting it, because it thinks there is no pressure.

 

The frog is right. same thing happens if you unplug the wire from the oil sender. Its a fail safe. Get a new sender. fuel pump will be fine.

 

Wait, what?

Thats not right at all.

 

thats you knock sensor wire its behind the oil filter a little

i agree to an extent and all oil pressure lights should be diagnosed before damage is done. simple way to tell is if there is any abnormal noises coming from the engine, if so turn it off. i dont believe the oil switch has anything to do with fuel pump operation because if it does than why can i still drive my vehicle and my old car.

my oil light is now on after removal of the motor and coolant sat in the sensor. this is the second motor to do this to me and i assure you there is nothing wrong with my motor.

 

A lot of people think that VN-VP-VR's use the oil pressure switch as the only source of power to the fuel pump. This is not correct.
The oil pressure switch is only used as a back-up circuit in case the ECM/PCM has a failure. In normal operation the fuel pump relay is controlled by an output from the ECM/PCM.
The oil pressure switch circuit on the VR's is different to the VN/VP's.
VN/VP's have the oil pressure switch contacts wired directly in parallel with the switching contacts of the fuel pump relay. If oil pressure is present, then power will be supplied to the fuel pump regardless of the state of the output of the ECM. Once the engine is running, you can remove the fuel pump relay and the engine will keep running.
VR's use a different type of fuel pump relay. It has a normally closed (NC) contact and a normally open (NO) contact. When the relay receives a signal from the PCM, the NO contacts close and pass power to the fuel pump. The oil pressure switch is wired to the NC contact. The only time the oil pressure switch can supply power to the fuel pump is when the relay is de-energised (in the case of a PCM failure). Because the back-up circuit actually passes through the fuel pump relay, if you remove the relay the engine will stop.
If someone has swapped the fuel pump relay in a VR with a standard 4-terminal relay (as used in VN/VP), then the oil pressure switch backup circuit will not work. VR's should have a 5-terminal relay.


borrowed from VN VP VR Fuel Pump - Holdenpaedia

 

Well if its true blow me down. At least oil pressure switches aren't expensive and you saved yourself changing it later when they invariably start to leak anyway.

 

If you have replaced the sensor and are still having oil light come on, chances are there is a real issue and it needs to be fixed, your standard engines oil pump has approx 1.5 x the pumping power then required so treat an oil light as a serious issue. Could be something simple like the oil way to thin but chances are the pickup is clogged or relief valve is stuck open ect. If you cant find a problem in the mean time run some Diesel oil through it if you as it contains lots of solvents and cleaning agents ect. Works a treat on engines full of crap and sludge.

 

I was a bit worried recently with an oil pressure gauge of mine, this page will probably help you get an idea of what to do/check:

Troubleshoot Oil Pump Problems

Before you say anything, im not saying the problem is your oil pump, but theres a lot of good other info on that page.

 

My VR had intermittent oil light and at any rpm. Check the dipstick as soon as the light comes on and check to see if the oil is foam, mine was caused by a cracked oil pickup pipe. I also had partially blocked gallery's in the oil pump/filter body.