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Engine misfire.

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Old 07-04-2020, 07:57 AM
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Default Engine misfire.
I have just replaced spark plugs, coils, fuel filter on my 2004 xk8 4.2l and have been running high octane fuel. I still notice that the car is skipping at normal operating speed , I don't notice a skip at idle. I sure could use some advice on the problem.
 
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Old 07-04-2020, 08:16 AM
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Originally Posted by Oldelance
I have just replaced spark plugs, coils, fuel filter on my 2004 xk8 4.2l and have been running high octane fuel. I still notice that the car is skipping at normal operating speed , I don't notice a skip at idle. I sure could use some advice on the problem.
Any codes ?
 
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Old 07-04-2020, 08:39 AM
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Originally Posted by Oldelance
I have just replaced spark plugs, coils, fuel filter on my 2004 xk8 4.2l and have been running high octane fuel. I still notice that the car is skipping at normal operating speed , I don't notice a skip at idle. I sure could use some advice on the problem.
+1 on knowing DTCs, if any.

This is posted in the wrong forum. Should be in the X100 forum if the vehicle is a 2004MY.
 
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Old 07-04-2020, 09:06 AM
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Originally Posted by George05
Any codes ?
no codes. Check engine light come on sporadically. When it's off I don't notice the skipp. When on I do.
 
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Old 07-04-2020, 09:46 AM
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Originally Posted by NBCat
... This is posted in the wrong forum. Should be in the X100 forum if the vehicle is a 2004MY.
Oldelance,
You're in the X150 Forum, for 2007-2015 XK/XKR models. You should be here: https://www.jaguarforums.com/forum/xk8-xkr-x100-17/
 
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Old 07-04-2020, 12:54 PM
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Originally Posted by Oldelance
no codes. Check engine light come on sporadically. When it's off I don't notice the skipp. When on I do.
Get a code reader/scanner on it
 
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Old 07-05-2020, 11:51 AM
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Originally Posted by Oldelance
no codes. Check engine light come on sporadically.
Should be codes, then. Sounds like your tool is failing to report them. They're kept AGES so they'll be there.

Also, look at the fuel trims.
 
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Old 07-05-2020, 01:24 PM
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Originally Posted by Oldelance
I have just replaced spark plugs, coils, fuel filter on my 2004 xk8 4.2l and have been running high octane fuel. I still notice that the car is skipping at normal operating speed , I don't notice a skip at idle. I sure could use some advice on the problem.
I've moved your question from X150 (2006 - 2014) to X100 (1996 - 2006) forum. This is the place to post technical questions about your 2004 XK8.

Graham
 
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