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Why Engine Light comes on and 1987 Buick Stalls?

There are several reasons why the engine light may come on and your 1987 Buick may stall. Here are a few possible causes:

1. Oxygen sensor: A faulty oxygen sensor can cause the engine to run inefficiently, leading to stalling and the illumination of the engine light.

2. Distributor cap and rotor: A worn or damaged distributor cap and rotor can cause ignition problems, resulting in stalling and a check engine light.

3. Spark plugs and wires: Faulty spark plugs or spark plug wires can cause misfires, leading to stalling and an illuminated engine light.

4. Catalytic converter: A clogged or damaged catalytic converter can cause the engine to run poorly and stall, triggering the engine light.

5. Fuel pump: A failing fuel pump can cause fuel starvation, leading to stalling and the engine light coming on.

6. Fuel filter: A clogged fuel filter can restrict fuel flow, causing the engine to stall and illuminating the engine light.

7. Idle air control valve (IAC): A faulty IAC valve can cause stalling and an engine light by disrupting the engine's idle control.

8. EGR valve: A malfunctioning EGR valve can impact the engine's performance, causing stalling and an illuminated engine light.

9. Engine coolant temperature sensor: A faulty coolant temperature sensor can provide incorrect engine temperature information to the engine computer, leading to stalling and an engine light.

10. Throttle position sensor (TPS): A defective TPS can affect fuel delivery and engine performance, leading to stalling and the illumination of the engine light.

It is important to have the specific error codes associated with the engine light retrieved and analyzed by a qualified mechanic to accurately identify the root cause of the stalling issue.