rpm go's under 10 and all oil lights go on.

Is it normal to idle at 5? my oil gauge go's to 0 under 10 rpm, says low oil and I hope its just the sending units.

The only way you can tell if you have adequate oil pressure at this point is to hook up a mechanical gauge in place of the sender. They are not too expensive. My idle on my 350 will sometimes go to 500 rpm, but it is supposed to idle at 650. It could be your IAC, or a clogged passage/dirty pintle. The gauge in the car is not always calibrated correctly. 5 psi may actually be more. You do have to be mindfull of the oil pressure in a 305, they have been known to have low pressure. the low pressure light is probably accurate, although if you can get it to idle a little higher, it should be OK. Your chime should go off if you have one, when the light comes on. There is a possibility that the sender is worn out, so replacing it is cheap and easy, just make sure you get the one for the gauge.

I bought the sender for the light. the gauge one is in the oil pan, i did'nt buy that one yet.

Ill tap the iac to see if it jumps. thanks.

The gauge one is not in the oil pan. The level sender is in the oil pan. The gauge is run by the same one that works the light, although it is not the same type that only works the light. The one that works the gauge is longer than the one that only works the light, but screws into the same place.

I cant even find it. haha. Its on top of the oil filter?

It is above the oil filter, and slightly behind it.

My OCC usually idles at 600 in drive, but keep in mind those tachometers are known for failing, and giving off readings, so your tach may just be off a little. I wouldn't go by anything a factory tach in these cars says, I'd check it with a mechanic's tach or an OBD computer for a truly accurate reading.

Its about 600. i re checked. it just drops alot. worn cable maybe. thanks

Tach is electronic, no cable.

Had that happen on my 92. Turns out it was the sender. Replaced it and it's been fine ever since.

Well thats good news for me mike. Every passenger I get is yelling at me your car is going to die. check your oil!! lol

I hear its common.

When my 305 did that, I replaced it with a pick and pull 350. The engine cost me abut $400.

No Fred dont say that! cheep for a 350 tho,

Sometimes real possibilities must be faced. Replacing a sick engine with good used one is often the answer, and if you can get an upgrade at the same time, that is a good thing. There are alot of good used 91-93 350s out there.

Most people do not like to look at real issues. I would like to get on my soapbox, and start about the government right now, but I will save it for another time.

FWIW Carl, my OCC has never always idled at a constant speed. It seems that when the motors cold it's speed at idle goes up and down slightly. Let us know how it goes with the oil lights thing. I know the 305 was known for oil pressure troubles, but the TBI 350 didn't seem to be affected by oil pressure problems much.