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You need a noid light for that but since they are all not firing it's most likely the cam shaft position sensor. That tells the computer the cam shaft position so it knows when to pulse each injector. Let me know if that's it. The cam shaft sensor should be pretty cheap.
I have had a similar problem and found that the centre wire from coil to
distributor cap had slipped back just far enough from inside the coil
to not make a good connection..and no spark meant cranking but no spark
to plugs...
The plug has probably been cross threaded in. If you try to remove it you may break it. If you do & it breaks & depending on where you live, you can ask around if anyone knows of anyone who can put a helio coil in where the spark plug hole is. It is a device which is threaded on both sides. He will tape the head spark plug hole & insert this device. Might cost a $100 or so. Good luck & I hope this helps you!
During cranking @crk sensor u should see up to 1 ac volt. Also if cam position sensor is @ fault u may not get a code, internal fault. Cam sensors are not availible,but rebuild kit is availible. The engine has to be set to top dead center aligning mark on crank pulley & tab aswell as mark on cam sensor itself.
1985 jaguar xj6 4.2 L Series 3
Firing Order 1-5-3-6-2-4
# 1 Spark plug at the last cylinder next to the firewall .
# 6 Spark plug at the front of th Engine nearest the fan .
The Rotation of the Rotor within the distributor cap is " Counter Clockwise
The Vacuun Advance Diaghram ( metal ) is more in line with the # 3 Spark plug wire .
Looking from the top near the Passenger side fender . If we know that the Number 3 Plug is more inline with the vacuum advance then moving " clockwise the next plug would be the # 5 and after that would be the # 1 plug
This shold get you on your way providing that nothing else has been tampered with . I hope that this has been helpful to you .
The spark plugs are numbered starting on the drivers side (1) to the passenger side (4), the distributor rotates clockwise, and the firing order is 1 - 3 - 4 - 2
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