Cadillac Repair: 1990 Fleetwood 4,5l, auto theft claim denied on purported forensics for key of the proper type

Question
Hello
Have a problem with my car.
The car is cold it runs super, no error indication.
At 110 degrees engine temperature goes from the machine. Error E41.
Starts engine car runs, no error, then the error display flickering.
Machine goes off. Error E12 E41 E49 E52 E55 E65.
New features include: Spark, Hall Switch, Hei modules, Oxygen sensor, MAT, MAP, TPS, EGR SOL; Gas Presure regulator, Air to Exhaust Check Valve 2x
Starts machine no error again flickering error E41, engine running.
Stuttering acceptance no gas engine turns off. Again all the errors.

Ignition of 10 to 45 degrees. Timing 10 degrees machine reboot

Grinding noise from automatic transmission! Oil and filter new.

Please help

Newly ordered Pickup Coil

Sincerely Karsten ( of Germany )

Answer
Hello,

You are fighting yourself and relying on codes on this antiquated system. In 1994 GM went to the OBD II system in which codes could be more trusted and exacting. On the 1990 you are dealing with the OBD I system and all codes are just a general indication of what might be wrong.
Trying to diagnose system problems without a factory service manual can be very costly and frustrating. See if you can purchases a 1990 Cadillac service manual on Craigs or Ebay. You will find diagnostic flow carts with the steps you must follow to eliminate potential problems one by one without replacing perfectly good components on a guess.

As for the grinding in the transmission, there is no general diagnoses for this symptom. I bet the pan was dropped and the filter changed because of this problem that did not get repaired by changing the filter.

The grinding could be caused from a major transmission problem in which possibly the clutches are coming apart, the gears. Don't know, but grinding is indicative of a transmission problem of some kind indicating a future failure.

Good luck.

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