Where does it point
The TDC Sensor on the XJS is in the front of the car -under- the crank (main) pulley. The Speed Sensor is under the car attached to the flywheel cover. Two wires, two small bolts on each, they are also identical parts. The engine starting or not starting and just cranking is dependent on these two sensors. The other sensors all send readings only when the engine is running. The Coolant Temp Sensor on the front top of engine block can seriously effect engine starting and running. All sensors wire back to the CPU, all sensors need to be working and not faulty.
SOURCE: 1989 jaguar xjs v12 fuel mixture
Chances are the coolant temperature sensor or its wiring have failed, or the vacuum line to the MAP sensor is leaky or broken (I believe the V12 in '89 guise uses MAP sensors). The MAP sensor measures Manifold Absolute Pressure. Along with this pressure the ECU looks at engine RPM. It also measures air temperature. Knowing pressure and temperature we know density, and knowing engine speed tells us how much volume of air is going through the engine. All of this together is computed into air mass and is used to calculate how much fuel mass should be admitted. If the vacuum line is broken, the ECU reads less vacuum and produces rich mixture thinking that the engine is under high load.
SOURCE: No oil pressure what so ever in v12 jaguar
have you tried reversing the pipes and see if that makes any difference other than that there must be a pressure difference between the two pumps try priming the filter with oil before starting.
SOURCE: I have a 1986 Jaguar XJS V12. I'm trying to remove
There are two 13mm bolts in the back window under the carpet that have to be removed. Remove the two plastic screws, Remove the carpet and find the two 13mm bolts..
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