All 8 spark plugs arcing to the head
Thread Starter
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Recovery Vehicle
Joined: Feb 2009
Posts: 1,198
Likes: 182
From: MEMPHIS, TN
Unless there's extreme corrosion on all of the threads which is near impossible, the spark is not coming from the he base. There is no difference in potential between there and the head; they are bonded together. That is the grounded portion of the spark plug.
I would suspect that it is indeed coming past the boot and only looks like it's coming from the base.
I would suspect that it is indeed coming past the boot and only looks like it's coming from the base.
Camel Trophy
Joined: Aug 2014
Posts: 4,743
Likes: 985
From: Southwestern Virginia
It's not how electricity works, Frank. I'm not ragging on you. You said yourself it was hard to see, and you couldn't until your eyes had adjusted a few minutes. It's impossible for two pieces of metal that are bonded to one another to arc. If they're arcing then there is no bonding and you have bigger issues. The threads in the head would need to be chased to clear out the corrosion and you'd need new spark plugs.
Thread Starter
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Recovery Vehicle
Joined: Feb 2009
Posts: 1,198
Likes: 182
From: MEMPHIS, TN
It's not how electricity works, Frank. I'm not ragging on you. You said yourself it was hard to see, and you couldn't until your eyes had adjusted a few minutes. It's impossible for two pieces of metal that are bonded to one another to arc. If they're arcing then there is no bonding and you have bigger issues. The threads in the head would need to be chased to clear out the corrosion and you'd need new spark plugs.
Rock Crawling
Joined: Nov 2017
Posts: 450
Likes: 81
From: Kailua Kona, HI
@Alex_M has it right. If you were getting severe arcing on all plugs from the base of the plugs, there is something ****y going on. Electricity ALWAYS follows the path of least resistance. If the path of least resistance is above its grounding point(the threads in the head) something is going on to cause serious resistance there.
New plugs and wires would be my first step as well
New plugs and wires would be my first step as well
Thread Starter
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Recovery Vehicle
Joined: Feb 2009
Posts: 1,198
Likes: 182
From: MEMPHIS, TN
@Alex_M has it right. If you were getting severe arcing on all plugs from the base of the plugs, there is something ****y going on. Electricity ALWAYS follows the path of least resistance. If the path of least resistance is above its grounding point(the threads in the head) something is going on to cause serious resistance there.
New plugs and wires would be my first step as well
New plugs and wires would be my first step as well
later.
Camel Trophy
Joined: Aug 2014
Posts: 4,743
Likes: 985
From: Southwestern Virginia
Please make note that I gave an option for you to be correct without breaking the laws of physics. An option that does, albeit exceedingly rarely, occur. Not trying to make waves, Frankie. Just telling you from several years of professional electrical experience what your options are.
Thread Starter
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Recovery Vehicle
Joined: Feb 2009
Posts: 1,198
Likes: 182
From: MEMPHIS, TN
Please make note that I gave an option for you to be correct without breaking the laws of physics. An option that does, albeit exceedingly rarely, occur. Not trying to make waves, Frankie. Just telling you from several years of professional electrical experience what your options are.
Mudding
Joined: Jun 2016
Posts: 208
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-- my 2 cents
Drifting
Joined: Apr 2019
Posts: 47
Likes: 39
Frank, you've been around too long and have made too many good contributions to this forum for me to bestow the full dweeb title, but you're a little dweebish this time.
AlexM's diagnosis is correct. Think about it this way: when installed in the head, the base of the spark plus IS the head, electrically speaking. If there's arcing there, it means something is interfering with the electrical connection between the threads of the spark plug and the threads of the head. It's akin to a forum member reporting arcing between the battery post and the battery clamp. It would be truly stunning for a problem to develop on all eight cylinders to cause the symptoms you've described. Good luck, Frank.
AlexM's diagnosis is correct. Think about it this way: when installed in the head, the base of the spark plus IS the head, electrically speaking. If there's arcing there, it means something is interfering with the electrical connection between the threads of the spark plug and the threads of the head. It's akin to a forum member reporting arcing between the battery post and the battery clamp. It would be truly stunning for a problem to develop on all eight cylinders to cause the symptoms you've described. Good luck, Frank.