Question about Jaguar XJ8

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My 1999 v8 sports jaguar keeps operating when i switch off the engin

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It's tedious, but start checking the wiring, two wires are touching somewhere or the ground is bad. Sounds like a engine ground, or a crossed wire. One connecter might be plugged in backwards making a self engerizeing circuit.
I would go over every connection and check the 2 engine grounds.

The ignition switch may be closed. This should open when the key turns the switch off to open the circuit.
the fact that you can remove the key indicates that the electrical portion of the ign switch is faulty.
If the ign switch is good and the lockbarrel is fine then the ign switch is being bypassed or shorted(hot wired).
If you can remove the key without switching to off, then the mechanism is badly worn in the lock barrel.
make sure the starter circuit is wired correctly as the bypass may be at its terminals.

Posted on Sep 10, 2010

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Posted on Jan 02, 2017

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After searching in vain for a Jaguar XJ sport V8 owners manual(2002can you please help? v8


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http://www.autozmagz.com/

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