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Re: 90 cutllass ciera 3.3 ltr
Check your fuel pressure regulator. Make sure you have a good vacuum to it and it is not leaking. 48 psi is a bit much and once it warms up will cause the vehicle to stumble and stall. Code 12 is a normal system.
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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.
For 83-86 Camry, 87 corolla, 84-87 pickups and 4-runner: Code 12 = knock sensor or circuit (distributor or circuit on Cressida, Supra, and Celica 3S-GE)
87-90 Camry, all other models 88-90: Code 12 = Rpm signal/no NE or G signal to ECU within several seconds after engine is cranked.
All models from 1991 on: Code 12 = Rpm signal No "Ne" signal to the ECM within several seconds after the engine is cranked. No "G" signal to the ECM two times in Succession when engine speed is between 500 rpm and 4000 rpm.
I don't think you have the OBD system yet in that vehicle . the 1-2 is a code 12 and should have flashed 3 times. 12 means the computer is working to give you codes. The 4-3 means code 43 and that should be:
Trouble Code 42 indicates that there may be a malfunction in the
Electronic Spark Timing (EST) system. During cranking, the timing is
controlled by the ignition module and the ECM grounds the EST line. It
expects to see no activity on this line at this time. When the ECM
enters EST mode, it applies +5 volts to the BYPASS line and expects to
see voltage variations on the EST line. Reasons for the ECM to set Code 42: 1. System in BYPASS mode (i.e. EST line supposedly grounded) but activity sensed on EST line 2. System in EST mode (i.e. BYPASS line driven with +5 volts) but no activity seen on the EST line
Possible causes include: 1. BYPASS line is open or grounded 2. EST line is open or grounded 3. Poor connections between ignition module and ECM 4. Poor routing of EST harness and/or poor quality ignition wires (EMI induced electrical noise 5. Faulty or incorrect ignition module 6. Faulty ECM 7. Faulty Pick Up Coil 8. Faulty Ignition Control Module
9. Faulty Crank Sensor or the Crank Sensor magnet probe could be cracked
tcc stuck try unpluging it and see if same but dont drive with unpluged will burn up transmission also could be fuel pump . or crank shaft postion sensor . try the tcc first then vheck fuel presure , and then check for codes with scanner
You may have a faulty crank sensor again. Next time it cuts off hot, spray or pour water on it and then try to see if it will crank. These cars had a cutting off problem with ecm #1228253 but most of them would start right back up. If it has that number on it replace it.with #16198264 or newer number. Get a delco and not an aftermarket ecm..