How to set timing on 99 oldsmobile cutlass 3.1 6cyl.

You just blew your head and gasket. I just had that same thing happen last month. When it over heated is the time that you blew the engine head's gasket. When you kept driving it is when you damaged your engine head. You also should have noticed that the as soon as you put water in the radiator that it was leaking out back of engine from the freeze plug or plugs. Cost of freeze plug is couple bucks "looks like small cup cake tin." The Freeze plug has to be replaced 1st, but depending on how bad the head is damaged you could get off cheap by pouring in a $40 gasket sealer liquid down into the radiator and lots of water to keep the water level up. I would also remove the thermostat and put host back on. Since your car is older that I do not think it ruined the values or rods.

engine got probably way too too hot could blowed head gasket cracked cylinder head.depends on how low coolant got if coolant level got close empty probably got engine damage.if coolant didnt get too low wait until engine cool down try cranking it.engine could have got so hot burned out ignition module.

Check your connections at the battery itself very carefully. These are notorious for causing trouble, especially high resistance like your getting. If your positive side is a double cable set-up, take it all apart and you will most likely find the problem. Alot of the time, the lug in the battery will pull out of the battery case, most of the time it's really heavy corrosion between the cables.

Check for blown head gasket if there is steam coming from the exhaust,also check that the theremostat is opening.

.with all the sensors and electronics made of plastic,if they are hot and you put water on them they can crack and get water in them. They might send the wrong message to your engine control module (computer)

The Oxygen sensor is very suspect. it is easy to damage on install, even with the correct tool.

Put the old one back in and test the car...

Check the prrimary and secondary resistance on your coil. Also check the resistance of the plug wires and plug gap.

is the temp gauge sender new
or the engine cooling fans spinning fast enough
air in the heating pipes ? bleeding

Wow! thats verry low miles for an 88. Check the fuel pressure at the injector. If the pressure is low the filter could be clogged or the pump is not putting out enough pressure. Replace both if the pressure is not up to par. also check the fuel relays.

Water pump is going out