[v12-engine] 85 V12 HE wont start please help to diagnose

Hi guys, my 85 XJ v12 didn’t start this morning, it was running
beautifully the last time I drove it a week a go. The engine turns
over but that�s about it. Can some one tell me what and how I need
to test to determine why? What is the first thing I should look
at? Fuses (location)? Spark? Fuel?

Thanks guys, any help would be hugely appreciated–
louien
Melbourne, Australia
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In reply to a message from louien sent Mon 30 Mar 2009:

Louien,

Couple of quick tests…

When the ignition key is turned to the ‘‘on’’ position, the fuel pump
should run for about 2-3 seconds and then stop. Note…not the start
or crank position…but ‘‘on’’. Have a helper who will turn the key
on, while you listen for the fuel pump to run. If it doesn’t, addl
info can be provided. If the pump runs for 2-3 seconds in this
test, we shall assume for the moment you are getting fuel to the
rail.

If the pump runs as per above…then you should check for a healthy
blue spark from one or more spark plugs. Requires removing the
plug, with plug wire attached, and grounding the plug on the
engine, and cranking the engine. Be careful not to get
yourself ‘‘popped’’ by the spark. Hold the plug with a pair of
pliers with rubber handles, and maybe wear leather gloves.

If you have no spark, check that the ‘‘inertia switch’’ located on
the front door pillar on the left side of the vehicle. Black box
about 2’’ x 3’’. There is a small push button at the top. Try pushing
the button down. If the switch has tripped, it will push down. If
it pushes down, try to start the engine. If it doesn,t push down,
it wasn’t tripped, and you still have another problem.

Additional info to follow once you report on the above.

SD Faircloth
www.jaguarfuelinjectorservice.com–
The original message included these comments:

Hi guys, my 85 XJ v12 didn’t start this morning, it was running
beautifully the last time I drove it a week a go. The engine turns
over but that�s about it. Can some one tell me what and how I need
to test to determine why? What is the first thing I should look
at? Fuses (location)? Spark? Fuel?


www.jaguarfuelinjectorservice.com
Jacksonville, Florida, United States
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
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In reply to a message from SD Faircloth sent Thu 2 Apr 2009:

thanks, will do these tests this weekend and let you know what I
discover. thanks again.–
The original message included these comments:

Couple of quick tests…


louien
Melbourne, Australia
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
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