Several reasons could trigger the choke light to stay on:
* Choke is stuck: The most common reason. The choke mechanism itself (often a bimetallic spring or a vacuum-operated system) might be malfunctioning and not returning to its open position after the engine warms up. This could be due to age, wear, or binding.
* Vacuum leak: If the choke is vacuum-operated, a leak in the vacuum line supplying it can prevent it from opening correctly, keeping the choke engaged.
* Faulty choke pull-off: Some systems have an electric pull-off solenoid that helps open the choke faster. If this is faulty, the choke might not open properly.
* Wiring issue: A problem with the wiring to the choke light itself could cause it to illuminate incorrectly, even if the choke is functioning properly. The light might be getting a false signal.
* Faulty temperature sensor: The choke system often relies on engine temperature sensors to determine when to disengage. A faulty sensor could provide inaccurate information, keeping the choke on for too long.
* Incorrect carburetor adjustment: In some cases, an improperly adjusted carburetor could lead to the choke remaining engaged longer than necessary. (This is less likely if the car was running fine previously, then the light suddenly came on).
To diagnose the problem, you'll need to check the choke mechanism itself for proper operation, inspect vacuum lines for leaks, test the electrical connections, and possibly consult a repair manual specific to your 1984 El Camino's carburetor and engine. If you're not comfortable working on the carburetor, it's best to take it to a mechanic.
