1991 Oldsmobile Cutlass Supreme-there's no spark. changed module, crank sensor, ecm. pls advise...

You are correct in that the AC cooling fan is controlled by the ECM, the problem is the sensor on the "Hot" side of the motor, which should be either right ON the thermostat or very near it. Change this, it should take care of issue.

Thinking crank sensor,don't know if it's a 3.1 or not,3.4?Anyway with the engine running CAREFULLY
tap the crank sensor with a dowel or driveway marker,some long stick. If the sensor is bad the engine
will stumble or quit when you tap it,Same test also will check for broken board in the ecm also.

Does it crank over at all? or just nothing when you turn the key? Do all the electronics still work in car?

You will need to change the crank position sensor first and see if it corrects the problem. It is located behind the engine near the firewall. It's a bit tricky to get to it, you would need to rotate the engine forward then look under the exhaust manifold and under the cylinder closest to the drivers side. Use a 10 mm deep socket to loosen bolt. After replacement and it is still stalling then you will need to replace the ECM (vehicle computer). If it turns out to be the computer, go to your local junkyard to get an inexpensive replacement Click on the link below to view the CPS, it is around $22

http://www.partstrain.com/store/?N=0&Nr=AND(make:Oldsmobile,model:Cutlass+Supreme,year:1993,brand:Delphi,part:Crank+Position+Sensor)&ptc=S1171391678W45d204bec356b&ptid=ptc45891f6tnywz&id=Olqtv7cphi





Olds-Cutlass-Ciera.htm">http://en.allexperts.com/q/Oldsmobile-Buick-Repair-826/f/1992-Olds-Cutlass-Ciera.htm

CHECK IGNITION MODULE FUSE.AND CHECK FOR POWER GOING TO MODULE AND COILS.IF NO POWER PROBLEM IN IGNITION MODULE FUSE OR LOOSE BROKEN WIRE.IF POWER GOING TO IGNITION MODULE.THE IGNITION MODULE FAULTY.TO SAVE MONEY AND TIME.HAVE CAR SCANNED TO MAKE SURE YOU DONT HAVE ECM OR PCM PROBLEMS.YOU DONT WANT TO BUY A IGNITION MODULE IF YOU DONT NEED IT BECAUSE THEY COST FROM $100.00 TO $200.00.THATS WHY SCAN IT FIRST.

Hi, I had the same problem with no spark at my 1993 Cutlass. I changed DIS module, Crank Sensor and checked the coils and still no spark. the problem was at the cable between the Crank sensor and the DIS module that was in short circuit. the cable has two pins at crank Sensor and three at DIS Module. (I believe that the extra PIN is the ground because the cable is shielded). The original cable has no isolation. I bought the cable in a yunk yard and the spark appear again. Check it, because this cable is exposed to high temperatures and oil and for this reasson they lost the isolate.

I have a 98 Chevy Astro but I'm guessing that you may have fried the computer because in the 90's that was how they were stopping car theft if you didn't remove the engine the exact way it was put in it could have fried the Computer (ECM)

ERROR CODE MALFUNCTION DESCRIPTION

12 ERROR CODE DIAGNOSTIC SYSTEM FUNCTIONING CORRECTLY

13 OXYGEN SENSOR CIRCUIT OPEN

14 COOLANT TEMPERATURE SENSOR CIRCUIT (HIGH TEMP)

15 COOLANT TEMPERATURE SENSOR CIRCUIT (LOW TEMP)

21 THROTTLE POSITION SENSOR (TPS) CIRCUIT (HIGH)

22 THROTTLE POSITION SENSOR (TPS) CIRCUIT (LOW)

23 MANIFOLD AIR TEMP (MAT) CIRCUIT (LOW TEMP)

24 VEHICLE SPEED SENSOR (VSS) CIRCUIT FAILED

25 MANIFOLD AIR TEMP (MAT) CIRCUIT (HIGH TEMP)

31 WASTEGATE SOLENOID ELECTRICAL SIGNAL FAILED

32 EXHAUST GAS RECIRCULATION (EGR) CIRCUIT

33 MASS AIR FLOW (MAF) CIRCUIT (HIGH)

34 MASS AIR FLOW (MAF) CIRCUIT (LOW / NO SIGNAL)

35 CODE NOT USED ON TURBO CARS

41 CAM SENSOR CIRCUIT FAILURE

42 C3I ELECTRONIC SPARK TIMING (EST) FAILURE

43 ELECTRONIC SPARK CONTROL (ESC) FAILURE

44 OXYGEN SENSOR CIRCUIT (LEAN EXHAUST)

45 OXYGEN SENSOR CIRCUIT ( RICH EXHAUST)

51 PROM ERROR

52 CALPAK ERROR

53 WATER INJECTION

54 CODE NOT USED ON TURBO CARS

55 ECM ERROR

Return to Chart
CODE 12

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,