Question about 1990 Oldsmobile Cutlass Ciera

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90 cutllass ciera 3.3 ltr

Car run fine 4 half hour then stubles and stalls fuel pres is 48 lbs code 12 comes up i think ecm or ign mod or crank sensor any ideas thanks in advance john

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Hello;
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.
Hope this helps.
Thanks;
Rich
RPM Northwest

Posted on Jan 22, 2009

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tap the crank sensor with a dowel or driveway marker,some long stick. If the sensor is bad the engine
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I recieved Code 12 from diagnosis


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I have two codes coming up,they are 1-2 and 4-3


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I hope this helped and good luck.

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1 Answer

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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

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