* No error message: The car might simply refuse to shift, get stuck in one gear, or exhibit strange behavior without any electronic indicators. This often points to mechanical issues like a faulty linkage, worn clutch (if automatic), low transmission fluid, or internal transmission problems.
* Check Engine Light (CEL): A lit CEL could indicate a problem with the transmission's electronic control system. You'll need to use an OBD-I (On-Board Diagnostics - 1) scanner (specific to the 1988 model year) to retrieve the diagnostic trouble codes (DTCs) stored in the car's computer. These codes are crucial to diagnosing the electronic issue.
* Other warning lights: Some Cadillacs might have specific transmission warning lights.
* Symptoms: The most important information is how the gearshift is malfunctioning:
* Slipping gears: The engine revs high but the car doesn't accelerate properly.
* Grinding gears: A harsh noise during shifting.
* Inability to shift into certain gears: The shifter might not engage certain positions.
* Shift lever feels loose or unresponsive: The linkage may be broken or damaged.
* Sudden shifting problems: This could point to low transmission fluid or a more serious internal transmission failure.
To get help, you need to provide:
1. The exact symptoms: Describe precisely what's happening when you try to shift gears.
2. Any warning lights illuminated: Note the symbol of any illuminated lights on the dash.
3. The type of transmission: Is it automatic or manual?
With this information, it will be possible to give you a more informed and helpful answer. You might also want to consult a Cadillac repair manual or a mechanic specializing in older vehicles.
