1995 Jaguar XJS Question:Cranks but will not start.

Was that really appropriate or helpful in any way? I'm retired military and you cannot hurt my feelings; just want to give you, the professional, a little advice. When someone admits to making a stupid mistake and is looking for help, the 'professional' that is responding probably shouldn't rub salt in the wound. No one gets helped, you lose a customer or future ally, and no one wins. I've learned a lot about my XJS since that not-so-good day and I appreciate all the other expert recommendations.

did you power wash the engine with it running?

No - engine cold and off. Would crank afterwards but "no start". have replaced Crank Position Sensor (CPS) but still the same. sounds the same situation you had.

What year? My issue was corrosion on the ECU (1995) - needed to strip and replace the two connectors. 76 connections. Fired straight up and now running perfectly. Diagnosis was a nightmare - OBD I is not a lot of help. Went through: changing the Crank Position Sensor, checking signal at the injectors (manually trigger), checking signal at the coils (again manually trigger), eventually pulling ECU to find that it looked like a battery left in a flashlight for 10 years (green and white corrosion / oxide). Water works it's way down the A pillar and slowly corrodes. Cleaning the engine (which is a 'must do' - whole different conversation as to why) was pure coincidence the ECU just failed at the same time! If yours is pre-95 12 cylinder lot of ECU's available on ebay. Jag refer to them as Petrol Injection and Ignition control Unit. Would recommend getting a spare to put away for the future anyway, they are getting less plentiful.

Sorry my car is the 1995 XJS 12cylinder ! Just been sitting in a covered dry free garage and first time she failed to start ! Hoping your advice works for me ! Thanks