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[tomuxzz]

Might also be worth checking the oil pressure relief valve while you're at it, although I can't remember where they are on this engine.

Blocked oil pickup is definitely a possibility and worth eliminating.

Could just be a lazy oil pressure switch?

If the oil pressure picks up quickly at higher revs it's possibly not work worrying about if the above check out OK.

It's normal for some variants of the V6 to idle as low as 450-500 RPM from memory.

Maybe, plus I changed to not to same switch. Stock switch is this :
https://www.gmpartsgiant.com/parts/gm-sensor-90566938.html
Buts impossible to buy this part so I changed to this:
https://www.gmpartsgiant.com/parts/gm-sensor-90337695.html

Later I will try to make video with acceleration at idle.

[TheBoy]

3.0l idle is 450rpm with A/C off and around 550rpm with AC on.

[Doctor Gollum]

Might also be worth checking the oil pressure relief valve while you're at it, although I can't remember where they are on this engine.

Blocked oil pickup is definitely a possibility and worth eliminating.

Could just be a lazy oil pressure switch?

If the oil pressure picks up quickly at higher revs it's possibly not work worrying about if the above check out OK.

It's normal for some variants of the V6 to idle as low as 450-500 RPM from memory.

Maybe, plus I changed to not to same switch. Stock switch is this :
https://www.gmpartsgiant.com/parts/gm-sensor-90566938.html
Buts impossible to buy this part so I changed to this:
https://www.gmpartsgiant.com/parts/gm-sensor-90337695.html

Later I will try to make video with acceleration at idle.

Something to consider, not all EPCs show the subsequent parts, and not all parts sellers have the presence of mind or ability/inclination to look beyond the "Discontinued" label. Leaving you to guess what the replacement might actually be.

Refit the original sensor and report back. No change means your old sensor is working normally.

[tomuxzz]

Might also be worth checking the oil pressure relief valve while you're at it, although I can't remember where they are on this engine.

Blocked oil pickup is definitely a possibility and worth eliminating.

Could just be a lazy oil pressure switch?

If the oil pressure picks up quickly at higher revs it's possibly not work worrying about if the above check out OK.

It's normal for some variants of the V6 to idle as low as 450-500 RPM from memory.

Maybe, plus I changed to not to same switch. Stock switch is this :
https://www.gmpartsgiant.com/parts/gm-sensor-90566938.html
Buts impossible to buy this part so I changed to this:
https://www.gmpartsgiant.com/parts/gm-sensor-90337695.html

Later I will try to make video with acceleration at idle.

Something to consider, not all EPCs show the subsequent parts, and not all parts sellers have the presence of mind or ability/inclination to look beyond the "Discontinued" label. Leaving you to guess what the replacement might actually be.

Refit the original sensor and report back. No change means your old sensor is working normally.

Old original sensor Shows iol presure when engine is off.
Few times I got that red lamp with old sensor, thats why a started whole process from that sensor.

[tomuxzz]

Hot engine:
https://www.youtube.com/watch?app=desktop&si=S-LQuYNT4yzQ6apZ&v=jHf-5uTrRj4&feature=youtu.be&cbrd=1&ab_channel=Tomas
Cold start:
https://www.youtube.com/watch?v=K2d5CzxY--E&ab_channel=Tomas

[Doctor Gollum]

That the light is on tells you there's an issue.

Weak pump, or wrong viscosity oil. You may also want to check that the engine number matches the Car Pass/VIN data to confirm that the engine hasn't been replaced with a potentially much higher mileage one than the odometer might suggest.

[Kevin Wood]

Hot engine:
https://www.youtube.com/watch?app=desktop&si=S-LQuYNT4yzQ6apZ&v=jHf-5uTrRj4&feature=youtu.be&cbrd=1&ab_channel=Tomas
Cold start:
https://www.youtube.com/watch?v=K2d5CzxY--E&ab_channel=Tomas

Looks to me like the light is telling you the pressure is low but the gauge is behaving normally. I would follow Nick W's suggestion, get a workshop pressure gauge and actually measure the oil pressure before going too much further.

[Nick W]

That the light is on tells you there's an issue.

Weak pump, or wrong viscosity oil. You may also want to check that the engine number matches the Car Pass/VIN data to confirm that the engine hasn't been replaced with a potentially much higher mileage one than the odometer might suggest.

There are plenty of other causes of the issue:
low oil level, wrong oil grade, worn component(these three are the most likely given the described symptoms), faulty switch(remember it's on/off), damaged wiring at the switch and others.


If the oil grade and level are correct(there's no reason to use anything other than 10w40 on a used engine), and the light goes out as soon as the revs rise off idle, then I would suggest there's nothing to worry about - this is how millions of engine have been used for decades

[Doctor Gollum]

That the light comes on when decelerating, was what I should have typed.

I did wonder about the level... although the pressure switch is on the front of the block so deceleration should have the opposite effect... Which leaves the pump from the three primary culprits.

[Doctor Gollum]

On a side note, that car makes alot of really annoying noises before it's running 

[Kevin Wood]

That the light comes on when decelerating, was what I should have typed.

I did wonder about the level... although the pressure switch is on the front of the block so deceleration should have the opposite effect... Which leaves the pump from the three primary culprits.

It doesn't matter where the pressure switch is, the oil pressure is almost constant everywhere downstream of the pump, but the location of the oil pickup pipe in the sump, and any baffles, etc. might do.

[tomuxzz]

That the light is on tells you there's an issue.

Weak pump, or wrong viscosity oil. You may also want to check that the engine number matches the Car Pass/VIN data to confirm that the engine hasn't been replaced with a potentially much higher mileage one than the odometer might suggest.

There are plenty of other causes of the issue:
low oil level, wrong oil grade, worn component(these three are the most likely given the described symptoms), faulty switch(remember it's on/off), damaged wiring at the switch and others.


If the oil grade and level are correct(there's no reason to use anything other than 10w40 on a used engine), and the light goes out as soon as the revs rise off idle, then I would suggest there's nothing to worry about - this is how millions of engine have been used for decades

Good,
And thanks for all replies Today I removed little sump. I didn't find any metal crumbs inside. So now I decided to use engine like it is.If the oil pressure drops even more, only then we will try to restore the oil pump (I have another not working engine which ended because there was no oil presure ) . Because removing for now it is too much work.
this what i found. looks good.

[tomuxzz]

Finaly I've found info about those oil pumps here:
https://www.drive2.ru/l/506958699240096649/
Try to use google translate I think I will use this modification.

[cam.in.head]

does look good yes . my pick up pipe was almost fully bunged up !
i renember replacing the o ring at the other end of the pick up pipe too .