My oil pressure light is coming on while the car is idling. when i give gas it goes away. what could the problem be? I have just had an oil change

Oil light comes on when idling because the oil pressure is low or restricted. This could be due to a clogged oil filter or oil pan strainer.there are several other reasons, these would require more information.Has the car had an oil change?What is the mileage of the vehicle?

Without hearing it, I can only guess. Collapsed lifter or loose connecting rod bearing.

High miles? Maintenance not done on schedule? That would do it.

the oil sending unit grounds out the dash light bulb as engine speed increases the pressure rises and turn light off normal idle hot oil pressure 30-40 psi. if low then engine bearings are worn.

Okay What it means is that the oil in your car is either low in level or the oil pressure at low revolutions is low. I highly recommend you to stop driving the car when this happen because you can internally damage the engine with a low oil or a low pressure of oil. Check the oil level first..make sure level is fine and oil looks good. Black and burned oil will give you a low oil pressure as well. If it happen that your car need a oil change. Make sure you get it done and see if the problem goes away. Very rarely oils pressure sensor goes bad but if oil is new and level is fine you can take the oil pressure sensor and connect a tester for a oil pressure. If this is not under the manufacturer specifications.. oil pump is worn out and you have to replace it for a new one.
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Low oil, bad sensor, really low idle.
First check oil level.
then if oil level is ok, and oil light is still there, pay attention to idle has to be 750 to 850 RPM.

If idle ok, give gas to increase idle to more than 2000 rpm if light goes away you need a sensor called OIL PRESSURE SWITCH.

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run a higher octane gas its more then likely lifter tap due to poor fuel,also check the oil and coolant

You could try thicker oil or stop using synthetic or add some lucas oil treatment or change the oil. The sender could be bad too. A diag is in order because if there is no presure the engine will soon die.

This is pretty common on the older vehicles. There are three primary things it can be.

1. The wear in the bearings is enough to bleed pressure to the point at low pressure it just won't stay up high enough.
2. You have a bad sensor
3. Your oil pump is not pumping enough pressure.

Most of the time you don't have to worry about it. I would go to a heavy weight oil like 10W40, and I would switch to full synthetic. It works great on older motors.

Hope this helps.

ok. oil ight is probably nothing more than a faulty pressure switch.You can have pressure checked at same screw in port. 15psi is ok...just. very cheap to replace. Ign control module is probably the cut-out fault. You cant really test it; repair by substitution is the trick.

changing the oil may fix the problem at least check the level is correct.