Hate to tell you this but it sounds like a bad or cracked coil.
take a look and see,sometimes the cracks are internal check for spark at the coil array if no spark from there theres your problem.High heat causes these type of coil systems to fail.
if you need a new one try "autopartswharehouse.com" or parts geek.com they have hard to find import parts at really good prices.good luck,Gary
SOURCE: 05 plate Jaguar X Type 2.5 V6 spark plugs
Sorry old man, but you need to remove the intake manifold to get to the rear plugs.
Good luck!
Tom
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: 1989 jaguar xj6 new engine or new cylinder???
At that price replace the engine. Make sure though that you get a warranty for the engine that includes the cost of installation if the new one fails. Most shops will warranty for 90 days which is long enough to find out if there is going to be a problem.
SOURCE: Engine cylinder mis-fire
standing in front of car cylinder # 1,2,3,4 on the left passenger side and # 5,6,7,8 on right drivers side. in that order for 2000 4.0 jaguar s type
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