XJ6 & XJ12 Series I, II & III 1968-1992

weak spark issues. pleaase help.

Old 05-28-2007, 09:03 AM
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Default RE: weak spark issues. pleaase help.

I don't want you to think I'm trying to bust your *****, but here on Jaguarforums.com we like to go back over the basics since in the middle of frustration from trying to get the car running, we tend overlook the basics. First of all, Welcome to the forum.
1) Have you recharged the battery, since trying to get the car started several times can drain it pretty quickly, specially on the old XJ!
2) The cap and rotor is good idea, and it shouldn't run you more than $30-$40.
3) Do you have gas? (again, not meant to insult you, just a basic)
4) Check your Grounds.
If this stuff doesn't solve the problem, then come back and tell us your symptoms. Good luck!
Old 05-28-2007, 09:27 AM
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Default RE: weak spark issues. pleaase help.

the cap and rotor can be bought at any auto parts store forunder $20.00

new spark plugs: $20.00 - I use Splitfire SF6E - gap at .035, great plugs.

Replace the Fuel Filter - could be gummed and clogged. Use the oem filter only. Get it at the Jaguar dealer -pay the price- there is no substitute.

you need to check if you have spark after replacing all the above - if you have spark, ignition is good, move on to the Fuel Relay - a known problem - probably corroded from the car sitting. Can be opened and the points cleaned with emery paper.

Clean the throttle plate withintake spray cleaner. could be gummed up.

Fuel Regulator - cylindrical drum with a steel line located forward of the coil - probably faulty or acting intermittent - needs to be checked with a pressure gage. this is a job for an experienced mechanic.

If still no start, check Ignition Module - a GM part inside it - NAPA has it, rectangular black box with two wires located near the ignition - they do go bad.

good luck!
Old 07-01-2007, 10:40 AM
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Default RE: weak spark issues. pleaase help.

usually the ignition module
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