[xj-s] No Spark, but a mystery why

Hey there,
I’ve got an 88 with a V12. It wont spark and therefore wont
start :(. I’ve replaced the Ignition module, rotor, cap,
wires, spark plugs, coil, and made sure that every connection
is absolutely perfect. I checked the resistance at the leads
from the pick up and I am getting a touch under 2.8Kohms. I’m
totally lost and am in need of some serious help! Any ideas?

Cheers–
staben913
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There are some tests of the Lucas CEI in the Jaguar Service Manual at
Section 86.35.00, pages 86-24 through 86-26. If you performed those
tests (in less than 30 minutes even if you’ve never done them before),
I believe you would identify the source of the problem, or at least by
reporting your results here, someone else could suggest the cause.

Please let me know if you don’t have the Service Manual, and I can send
you some info.

George Balthrop, Clifton, VA USA
89 and 85 XJ-S Coupes; 89 XJ40 VDP-----Original Message-----
From: staben913 stabendesign@gmail.com

I’ve got an 88 with a V12. It wont spark and therefore wont
start :(. I’ve replaced the Ignition module, rotor, cap,
wires, spark plugs, coil, and made sure that every connection
is absolutely perfect. I checked the resistance at the leads
from the pick up and I am getting a touch under 2.8Kohms. I’m
totally lost and am in need of some serious help! Any ideas?

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In reply to a message from George Balthrop sent Sun 16 Mar 2014:

I dont have the manual, some info would be great! :)–
staben913
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In reply to a message from staben913 sent Sun 16 Mar 2014:

perhaps the coil in the distributor that picks up the rotor
‘‘teeth’’ (Sorry forgot all the terminology) has gone open or
short circuit.

The ignition amplifier needs to see clean pulses from this
coil to fire the plugs, I think even bad adjustment of the air
gap can stop it working.–
1985 XJS V12 HE TWR (Black Betty) - www.bryansplace.net
Gold Coast Qld, Australia
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In reply to a message from Bryan Burgess sent Mon 17 Mar 2014:

That’s good to know! I have the specs for the air gap, so
I’ll check it today. Thank you.–
staben913
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
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