Most likely location: The ignition module is *most likely* integrated into the distributor on a 1986 Buick LeSabre. The distributor itself is located on the engine, usually near the top, towards the front.
To find it and replace the integrated module (if that's the case):
1. Locate the Distributor: Open the hood and locate the distributor. It's a cylindrical component with a rotor and cap on top. The distributor will be near the engine's timing chain cover. You may need to refer to a repair manual or a diagram specific to your vehicle's engine to be completely sure.
2. Safety First: Disconnect the negative terminal of the battery to prevent accidental short circuits.
3. Access the Distributor: You might need to remove some wiring harnesses, vacuum lines, or possibly even an air cleaner assembly to gain better access to the distributor.
4. Identify the Ignition Module: On many 1986 LeSabres, the ignition module is a component *within* the distributor itself and isn't easily replaceable as a separate part. The module is often a small electronic component that may be soldered to the circuit board inside the distributor. Trying to repair this typically involves replacing the entire distributor assembly.
5. Replace the Distributor (most likely): If the ignition module is indeed integrated, it's nearly always more practical to replace the entire distributor assembly. You'll need to carefully remove the distributor cap and rotor, remove the distributor hold-down bolt, and carefully lift out the distributor. Installation is the reverse procedure.
6. Reconnections: Carefully reconnect all the wires, vacuum lines, and the distributor cap and rotor.
Important Considerations:
* Repair Manual: A repair manual specific to your 1986 Buick LeSabre is highly recommended. It will provide precise diagrams and instructions for your exact engine type. A Haynes or Chilton manual would be a good choice.
* Professional Help: If you are not comfortable working on your vehicle's ignition system, it's best to take it to a qualified mechanic. Improper installation can lead to engine damage.
* Distributor Alignment: When reinstalling the distributor, the timing is critical. Incorrect timing can cause serious engine damage. The repair manual will provide instructions on how to properly align the distributor during installation. Often, this involves checking a timing mark on the crankshaft pulley.
In summary: While there might be exceptionally rare cases where the ignition module is a separate unit, the most probable scenario for a 1986 Buick LeSabre is that the module is integrated into the distributor, necessitating distributor replacement rather than module replacement. Always consult a repair manual before attempting any car repairs.
