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Arc from plug/boot on cylinder #5

Posted: Sun Dec 07, 2014 9:19 pm
by CorvetteBeretta
I'm getting an arc from plug/boot to exhaust manifold gasket shield on plug #5 I cant tell if its coming off the boot or the plug itself. The car has been sitting for 3 years so I'm thinking the plugs might be shot and its not constant it happens on and off. I checked the plug wire it seems to be ok anybody have any suggestions...

Re: Arc from plug/boot on cylinder #5

Posted: Mon Dec 08, 2014 6:49 am
by 1988GTU
What does the plug body look like? Picture?

Either the wire and or plug is bad.

Re: Arc from plug/boot on cylinder #5

Posted: Wed Dec 10, 2014 9:52 am
by ronaconda
Swap the wire with the #3 cylinder and see if the arc moves to that cylinder's spark plug. If it moves, bad wire. If not, bad plug.

Re: Arc from plug/boot on cylinder #5

Posted: Wed Dec 10, 2014 8:39 pm
by CorvetteBeretta
Thanks all for your help Im going to install new plugs and test the wires tomorrow

Re: Arc from plug/boot on cylinder #5

Posted: Wed Dec 10, 2014 8:44 pm
by Money pit Beretta
Check Rock Auto if you need wires. For my year they had clearance sets for ultra cheap! Like less than half price. They may have some for your car too.

Re: Arc from plug/boot on cylinder #5

Posted: Sun Dec 14, 2014 12:17 am
by CorvetteBeretta
So I changed my plugs ( used e3's) when I pulled the wires off the coil pack (closest to the trans) I think it fires #5 and #3, both contacts were rusted even the insides of the boot were rusted. So it looks like I need a new coil pack and plug wires, I'm also going to change the ICM since I have never changed it. I cleaned it as best I could considering all my tools are at my shop and its still arcing I'm not surprised.... I will get some pics up

Re: Arc from plug/boot on cylinder #5

Posted: Sun Dec 14, 2014 8:52 pm
by 3X00-Modified
If it's still arcing the the wires are crap.. just replace the wires.

Re: Arc from plug/boot on cylinder #5

Posted: Mon Dec 15, 2014 7:07 pm
by Money pit Beretta
Someone is not using dielectic grease..........

Plugs should be AC or NGK, others will cause problems. Just FYI.