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post #1 of (permalink) Old 02-09-2002, 11:36 AM
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Burning spark plug wires

Hi all, this is not a 4x4 question but a chev question, I work for a motor home dealership & we have replaced an engine (built by outside source)for a customer. 1990 454cid. tbi. on a p-30 chassis. now the 3rd wire back on right side melts just just above plug after about 50 -100 miles.
we have replaced intake gaskets after we found a small vacume leak right same exhaust port.
now we are out of ideas, anyone have any ideas ??
thank you.

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post #2 of (permalink) Old 02-09-2002, 11:45 AM
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Re: Burning spark plug wires

Do you have heat shields between the plug wire and the header/manifold?


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post #3 of (permalink) Old 02-09-2002, 11:51 AM
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Re: Burning spark plug wires

Yes there are heat sheilds & it is just the one wirw that is burning the rest are fine.

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post #4 of (permalink) Old 02-09-2002, 01:46 PM
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Re: Burning spark plug wires


What if you fired it up when it was dead cold and put your hand there to feel for ex coming from somewhere? Maybe have someone hold the brakes and lean on the converter to make some good ex pressure.

It would be kinda hard to do with a mechanical fan, but another thought would be to blow thick drag from a cigarette into the area.

If it's not from ex gas escaping it might be timing. Retarded timing creates intense manifold heat. If you meant right side as looking at the motor (driver side), then that would be cyl #5. If you crossed 5 & 7 wires it would make #5 run real hot. But you would probably notice that mistake because #7 would be too advanced.

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post #5 of (permalink) Old 02-10-2002, 02:14 AM
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Re: Burning spark plug wires

Burning plug wires on big blocks in RVs and other heavier trucks is a big problem. I use to fight it all the time. But I now have a vendor who sells me a MSD set with good long heat covering on the plug wires. I have not a problem since. I have to get to work to get the part number for the wire set. You can try to track down a set with the part number or I can give you the number to where I buy them from. They are a propane carburation shop in Minn.
You will have to send me E-mail or something to remind me if you have an interest.

post #6 of (permalink) Old 02-10-2002, 12:55 PM
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Re: Burning spark plug wires

is the body of the sparkplug discolored? perhaps the sparkplug is loose (believe it or not, i've seen this happen before, the boot didn't get burnt but the wire did).

an exhaust leak will trash plug wires in short order. a spray bottle filled with windshield washer fluid works to find exhaust leaks. they're also good for vacuum leaks, squirt and listen for rpm change.

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post #7 of (permalink) Old 02-10-2002, 07:08 PM
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Re: Burning spark plug wires

I know Accell makes some "armoured" plug wires. BogginChevy likes his. Those might work.


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post #8 of (permalink) Old 02-10-2002, 07:45 PM
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Re: Burning spark plug wires

The plug is not loose,the boot is not discolored,there is no exhaust leak & where the wire is burning or melting is just above where the metal contact attaches.

post #9 of (permalink) Old 02-10-2002, 07:50 PM
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Re: Burning spark plug wires

Sounds like to much heat. I had a set of Borg&Warner plug wires do that to me when I was running Splitfire plugs. Were melted right to the spark plugs, I ripped 7 out of 8 of them off trying to get them off the plugs.[img]/wwwthreads_images/icons/tongue.gif[/img] Yeah, I know, I know.....Splitfires.......... Anyways, a switch to regular plugs and some good quality MSD spark plug wires stopped that. I'd think those Accell wires would work well for this.


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post #10 of (permalink) Old 02-10-2002, 09:06 PM
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Re: Burning spark plug wires

dielectric grease works good to put on the plugs to keep the boots from sticking.

i'm a fan of Taylor wires myself and at $45 for a custom set for your vehicle, they're a steal. i think they're good for something like 500 of radiant heat or something.

oh yeah, splitfire plugs aren't worth the hammer to break them but i do like their plug wires.

"You know you're a yooper when the only way you can balance your tires is by cutting off lugs".
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