XJ XJ6 / XJR6 ( X300 ) 1995-1997

Ignition Coils

 
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Old 03-29-2019, 12:01 AM
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Default Ignition Coils

I read some old threads regarding ignition coils and I was wondering what the update is. That is are any of the off-brand coils lasting more than a year? Can you still get the Lucas coils that came from Japan? If yes, then how much?
I have 140,000 miles on my car and I suspect that the coils are original. The car drives very nicely but does not have the same power as my 95 xjs so I was wondering if this could be because of the coils? I have 40,000 miles on the plugs and will look at them tomorrow.
Thanks!
 
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Old 03-29-2019, 08:43 AM
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I have been using QYL brand of coils for close to 2 years now. You can buy a 6 pack of them on Amazon for around $80.00. They are made in China and so far no problems. The Japanese coils are still available from one of the forum sponsors and are around $100.00 each.
 
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Old 03-29-2019, 08:57 AM
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Hi jomo,

At 40,000 miles, it's probably time for new plugs. Before you worry about your coils, I would recommend you do a basic tune-up: New Champion RC12YC plugs, air filter, fuel filter, clean the gunk out of the air intake plumbing and crankcase breather hoses, clean the engine bay ground points, including the engine ground strap, clean your Crankshaft Position Sensor (CKPS), adjust your throttle cable, and check your drive belts. Consider changing your coolant thermostat if it's been awhile.

I can't recall whether Live Data can be viewed with a scan tool on the '96 X300, but if so, you might check your Short-Term and Long-Term Fuel Trims for signs of lean or rich running, and check the various Engine Management System sensor signals for plausibility. For example, if the Engine Coolant Temperature Sensor fails at a resistance the Engine Control Module interprets as "cold," the ECM will continue to apply cold-start fuel enrichment even after the engine has reached full operating temperature. Likewise if the coolant thermostat is stuck open. Intake air leaks or problems with the Idle Air Control Valve can cause lean running.

Cheers,

Don
 

Last edited by Don B; 03-29-2019 at 09:05 AM.
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Old 03-29-2019, 09:34 AM
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Originally Posted by Don B View Post
(...)
I can't recall whether Live Data can be viewed with a scan tool on the '96 X300
(...)
It can.

In this case though, sluggish car will most likely mean TPS out of adjustment due to stretched out linkage. Mine was showing 4.2V at full open throttle when it should be showing as close to 5V as possible. At 4.2V at WOT it felt quite sluggish, when I re-adjusted it, it felt like I got an extra cylinder
 
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  #5  
Old 03-29-2019, 04:57 PM
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Re-adjusted? How?

Originally Posted by katar83 View Post
It can.

In this case though, sluggish car will most likely mean TPS out of adjustment due to stretched out linkage. Mine was showing 4.2V at full open throttle when it should be showing as close to 5V as possible. At 4.2V at WOT it felt quite sluggish, when I re-adjusted it, it felt like I got an extra cylinder
 
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Old 03-29-2019, 08:02 PM
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Originally Posted by Vee View Post
Re-adjusted? How?
I assume what katar83 meant by adjusting the "stretched out linkage" was adjusting the throttle cable, as I mentioned in post #3.
 
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Old 04-13-2019, 12:30 AM
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Originally Posted by Don B View Post
Hi jomo,

At 40,000 miles, it's probably time for new plugs. Before you worry about your coils, I would recommend you do a basic tune-up: New Champion RC12YC plugs, air filter, fuel filter, clean the gunk out of the air intake plumbing and crankcase breather hoses, clean the engine bay ground points, including the engine ground strap, clean your Crankshaft Position Sensor (CKPS), adjust your throttle cable, and check your drive belts. Consider changing your coolant thermostat if it's been awhile.
Cheers,

Don
Here is my update. I changed the plugs and got decent improvement. I cleaned the throttle body but it was actually very clean. The air filter is fine (always!). I also cleaned the gunk out of the air intake plumbing and crankcase breather hoses which again was fairly clean. I am fighting right now to get the fuel filter off. It is not in the worst place but is a bit of a pain. I got one line off and will finish up tomorrow. I have a feeling that will make a big difference.I changed the thermostat when I got the car 40,000 miles ago.

I do have a couple of questions. Where is the Crankshaft Position Sensor on this car and how do I adjust the throttle cable (or even know if it needs adjustment)?

Thanks for your time!
 
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Old 04-13-2019, 05:39 AM
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Old 04-13-2019, 06:46 PM
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Originally Posted by b1mcp View Post
Wow is that helpful! Thanks
 
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Old 04-13-2019, 06:52 PM
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It took a total of 90 minutes to get that fuel filter out. It was fun! The new filter was connected easily and the car drive better! Tomorrow I will clean the Crankshaft Position Sensor.
Thanks for everyone's help!
 
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Old 04-18-2019, 11:30 PM
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Hi,
Here is another update. I did everything that was suggested. Then my coolant temp sensor went bad and I changed that. The car still has a slight hesitation sometimes when I accelerate for just a fraction of a second. But this is my jaguar and that is unacceptable.
I think that I need coils, but first I will swap the coils from my 95 xjs and see if that corrects the problem. If it does, then I will purchase new QYL coils from Amazon.
For the record the car does drive better with the recent tune up
Thanks for your help
 
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  #12  
Old 04-22-2019, 04:10 PM
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Final update. I swap the coils from my xjs and there was a decent improvement with no hesitation at all or should I say no misfire. Since the misfire went away I ordered the QYL coils from Amazon and they arrived today. I installed them and wow is there a huge difference. This car, with its new shocks (those rear shocks took a whole day to put in!), tires and recent tune-up drives amazing.
These cars are a blast to drive. Now it is time to get the convertible xjs ready!

Thanks for every ones help. It was not expensive and not hard to do a decent tune up on the car. BTW, the coils were $85 and has very nice reviews from XJ6 owners
 
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  #13  
Old 04-23-2019, 12:21 PM
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Excellent! Please remember to come back here and update us if the coils begin misbehaving in the future. It may take 6 months, a year or longer...
 
 
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