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Old 05-07-2013, 08:52 PM   #1
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Default Check this out...found this when changing wires

ok I bought new Delco wires for my car and did the easy ones first..the front 3...the middle plug looks like it has small black lines or cracks in the porcelin....is this my bucking problem ??
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Check this out...found this when changing wires-img-20130507-00116.jpg  
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Old 05-07-2013, 09:17 PM   #2
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Those black lines are very fine cracks. The black is caused by carbon build up from arcing out to ground. This will absolutely give you a misfire.
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Old 05-07-2013, 09:33 PM   #3
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Those black lines are very fine cracks. The black is caused by carbon build up from arcing out to ground. This will absolutely give you a misfire.
so just replace that one plug and the rest of the wires ??

Also I noticed the OLD wires say "Packard" not ac delco...the new ones say AC Delco Silicone....
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Old 05-07-2013, 10:23 PM   #4
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also...how much dieelectric grease should I use on both the plug tip and coil pack tip ??? Just a dab on the tip or cover the porclin on the plug too ??
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Old 05-07-2013, 10:27 PM   #5
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Carbon trace. Bad plug. Be careful when putting them in that your straight with the socket, and not over tightening the plug.
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Old 05-07-2013, 10:37 PM   #6
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as far as the die electric grease...put it on the tip of the plug and coil or on the inside of the boot or on the porcelin ??
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Old 05-08-2013, 12:14 AM   #7
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as far as the die electric grease...put it on the tip of the plug and coil or on the inside of the boot or on the porcelin ??
Pinky dab on each: Coil connector and both wire ends.
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Old 05-08-2013, 01:04 AM   #8
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Originally Posted by goldfinger22 View Post
so just replace that one plug and the rest of the wires ??

Also I noticed the OLD wires say "Packard" not ac delco...the new ones say AC Delco Silicone....
You may have pulled the original wires off. I also had this brand on the car when I got it, and I believe that mine was serviced at the dealership last. What brand of plugs came out? AC Delco?
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Old 05-08-2013, 07:43 AM   #9
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You may have pulled the original wires off. I also had this brand on the car when I got it, and I believe that mine was serviced at the dealership last. What brand of plugs came out? AC Delco?
this car only had 2k on it when i bought it...it had ac delco plugs in it....i would assume these were factory wires....


as for the dieelectric grease...it doesnt make sense to me to put it on the contacts...is no conductive......
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Old 05-08-2013, 09:13 AM   #10
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That is exactly the point of dielectric grease ... it is non-conductive. It keeps moisture out of your electrical connections without creating a path to ground or bridging two contacts. Also makes it easier to remove boots from spark plugs. I use dielectric grease on every electrical connection I take a part, including the boots at both ends of the spark plug wires.
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