That reminds me of a Peugeot I was asked to look at a few month ago with a suspected seized engine. The mechanic took the spark plugs out to see if relieving the compression would make it crank a little. If cranked a lot and sprayed 1.6 liters of fuel all over the workshop floor. They got me in to figure out why the cylinders were filling up with petrol. Turns out the ECU had developed a fault and was permanently switching on all 4 injectors as soon as the ignition was turned on.