I just bought a 1986 XJ6 4.2 LITER straight 6 cylinder. It was running when put away for the winter in November. When taken out it turns over but no spark from plugs. Battery good, power to fuel pump good ,power at condensor. Don't know Jags. What is it ?
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Check for power on the White wire at the ignition coil positive side.Check for a trigger signal on the White/Black wire on the negative side of the coil. This signal comes from the amplifier. If power and signal are present, replace the coil. If no signal proceed to step 4. Check for power on the White wire at the ignition amplifier. Disconnect the distributor pick up leads from the amplifier and measure the resistance of the pick up coil, should be 2.2K-4.8K ohms.