Where is the cold start relay located on a 1985 jaguar xjs?

The 1985 Jaguar XJ-S doesn't have a "cold start relay" in the same way some other vehicles do. Instead, the cold starting function is largely handled by the cold start injector and its associated circuitry within the fuel injection system. There isn't a single dedicated relay that controls this. The cold start injector is activated by a signal from the engine control unit (ECU) based on various sensor inputs (like engine temperature).

Therefore, there's no specific location to find a "cold start relay." Troubleshooting a cold start issue on an XJ-S of that year involves checking the:

* Cold start injector itself: Inspect it for proper operation and spray pattern.

* Engine coolant temperature sensor: This sensor informs the ECU about engine temperature and is crucial for activating the cold start injector.

* Fuel injectors: Ensure all injectors are working properly. A weak or faulty injector could mimic cold start problems.

* ECU: The ECU itself could be faulty and not sending the correct signal. This is the most complex and difficult to diagnose.

* Wiring: Look for any damaged or corroded wiring related to the fuel injection system.

If you're having cold starting problems, it's recommended to consult a Jaguar specialist or someone experienced with the intricacies of the Lucas fuel injection system used in these cars. Trying to diagnose this without the proper tools and knowledge can lead to further issues.