All 8 spark plugs arcing to the head

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Jun 25, 2019 | 07:02 AM

#21

JUKE179r

Camel Trophy

Joined: May 2016

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From: Britainistan, UK

Hey Frank... have a Snicker's mate. You're not you when you're hungry. lol

Jun 25, 2019 | 08:58 AM

#22

Frank4

Thread Starter

Recovery Vehicle

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From: MEMPHIS, TN

Eyes rolled out of my head.

Jun 25, 2019 | 11:18 PM

#23

No Doubt

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Joined: Jun 2017

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From: Alabama + Vegas + Texas

Is it possible that the spark plugs were over-torqued and cracked their ceramic insulation right above the part of the engine where you saw arcing?

Jun 26, 2019 | 07:25 AM

#24

Luc1f3r

Drifting

Joined: Jan 2019

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Quote:

Originally Posted by Alex_M

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.

This. The porcelain insulator is probably cracked at the base making it look like its coming from the base.

Jun 26, 2019 | 10:09 AM

#25

mln01

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From: Charlotte

Quote:

Originally Posted by Luc1f3r

This. The porcelain insulator is probably cracked at the base making it look like its coming from the base.

But isn't it unlikely that would be the case for all eight spark plugs? And even if that were the case, wouldn't they arc to the base of the plug instead of to the head?

Jun 26, 2019 | 12:16 PM

#26

JUKE179r

Camel Trophy

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From: Britainistan, UK

Quote:

Originally Posted by mln01

But isn't it unlikely that would be the case for all eight spark plugs? And even if that were the case, wouldn't they arc to the base of the plug instead of to the head?

Defective or overtorqued/cracked plugs maybe?

Jun 26, 2019 | 06:57 PM

#27

shanechevelle

Pro Wrench

Joined: Oct 2011

Posts: 1,709

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From: NE PA

Cracked insulator.
Gap to far.
Some substance LIKE ANTISIEZE OR SILICONE on the threads.
Paint on the heads, threads.
I also read somewhere once about the wrong temp/plug/resistance can cause this...are you positive you have the right plugs?
Loose plugs.

Once I had painted a Chevy V8 distributor cap with lead paint...late 70's, early 80's. Car ran like crap. When you ran the car at night in the dark current was flowing all over the cap...looked pretty cool actually.

Idk why the posts in this thread are going south. Kind of comical.