Error codes i have a 1991 cutlass supreme oldsmobile 3.1 engine and the codes 12, 32, 33, 35, and 44 is showing up...what does each one mean?

If not reachable from underneath the engine tips forward to change they make a holding tool. Loosen the dog bone engine mounts and lean on the car you'll see the engine move pull it forward with a bar then find something to hold it there. I hope this helps. Take Care.

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Type: 1989 Olds Cutlass OBD1 Code 51

You can either call a locksmith. Or go to the dealership and take the VIN number. They can cut you a key. Any GM dealership will have the key code.

You can go to a nearby parts store and purchase a Haynes automotive reference guide and it contains all the different diagrams that would need. On the front of the book it would say 1990-94 lumina cutlass etc.

PCV valve under hood center upper engine area, mounted in rear valve cover.

1991 Oldsmobile Cutlass Supreme 3.4L SFI DOHC 6cyl
The Oxygen Sensor is located: Under hood, center, rear engine area, below valve cover end, mounted in exhaust pipe

Hope helps with this.

I am having a similar problem, but there is no check engine light. It seems that mine dies at the light or running, if the rpm's drop. I am wondering if the Idle air control valve is bad or possibly the ERG valve?

Did you try checking or replacing the coolant sensor? I think you should replace it along with the thermostat. Are there any problems like sputtering or any unusual noises or symptoms? Smoke, anything?

Check for fuses/power/ground to the engine computer (or injector drive computer) whatever the case is.

Spark, fuel pump, and starter all are independant of the fuel injection computer.

Either the computer itself has gone bad, or it is not receiving power or ground, or wiring to the injectors might be bad...

3 on front and 3 on back of engine. the wires coming from coils,on top back of engine,