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CarQuestionGuy, Technician
Category: Car
Satisfied Customers: 1259
Experience:  ASE Master Auto Technician for 5 years, ASE Refrigerant Handler, ASA, iATN
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1993 olds cutlass supreme: my check..code reader..bad miss..coils

Customer Question

i have a 1993 olds cutlass supreme 3.1 t. my check enginge lilght comes on but when i attempt to check it with a code reader i does not give me any has a bad miss and no power, i have changed the plugs, and coils and map sensor...thank you
Submitted: 9 years ago.
Category: Car
Expert:  CarQuestionGuy replied 9 years ago.
Thanks for using Just Answer

Here is how to get the codes without a scan tool. Let me know if you need anything else.

To extract a trouble code from the computer for diagnostic purposes, the Assembly Line Communication Link (ALDL) connector is used.

The ALDL diagnostic connector is located in the passenger compartment. Terminal B of the connector is the test terminal and terminal A is the ground used for diagnostic display.

If the test terminal is grounded with the ignition "ON" and engine not running, the system will enter the diagnostic mode. In this mode, the computer will display a Code 12, three consecutive times, by flashing the "CHECK ENGINE" or "SERVICE ENGINE SOON" light. A Code 12 consists of one flash, a short pause, then two flashes in rapid succession. After Code 12 is displayed, any stored trouble codes will be displayed by flashing the "CHECK ENGINE" or "SERVICE ENGINE SOON" light. All codes are displayed 3 times each then a code 12 will repeat. In the diagnostic mode, the computer will also energize all computer controlled relays and solenoids. graphic
Customer: replied 9 years ago.
Reply to Not a mechanic, a Technician's Post: that i have done, my problem is it will not show me the codes whether i ground the aldl or use a tester...i need to know how to fix the issue with the check engine light not giving me the codes even though there is a code in the memory
Expert:  CarQuestionGuy replied 9 years ago.
I didn't know that you have already tried that, I didn't see it in your original question.
If the computer does not give you codes no matter what, then there is most likely a problem with the computer or possible with the wiring being loose.
Customer: replied 9 years ago.
i was pretty sure the computer was to blame...i just wish i can figure out why its missing so bad....i was driving it on the freeway and it suddenly lost power, i was able to drive it home but since then the idle is low and rough, and on acceleration it sputters extremely bad.. this happened once before and i replace the coil,and it was i have replaced all 3 coils, o2, plugs, and map sensor
Expert:  CarQuestionGuy replied 9 years ago.
If the computer is not working then it would be very hard to tell what is going on. It can be done by a very good tech, but it is difficult and would include a lot of labor. Also, if the computer is bad it could be the cause of your problems.
CarQuestionGuy and other Car Specialists are ready to help you
Customer: replied 9 years ago.
thank you for your quick response
Expert:  CarQuestionGuy replied 9 years ago.
No problem. I hope you can get your car figured out. I wish I could have been even more help but that is hard when the car isn't here. Thanks fro accepting and thanks for using Just Answer.