There isn't a dedicated "auto choke shutdown relay" in the way you might think of a relay controlling a solenoid or other device directly related to the choke's operation on a 1986 Chevy Celebrity 2.8L. The choke system on these older vehicles is primarily mechanical, with the automatic function driven by a bimetallic spring in the carburetor itself, not electronic relays. The engine's computer (ECM) might *indirectly* influence choke operation through things like cold engine enrichment, but there's no single relay specifically cutting power to the choke mechanism.
Any issues with the choke's operation are usually traced to the carburetor itself (stuck linkage, faulty bimetallic spring, etc.), the engine coolant temperature sensor (influencing the ECM's fuel mixture strategy), or potentially a problem within the ECM's programming or circuitry if there are electronic aspects to the enrichment strategy.
