97 460, burning up plug wires.


rusty ol ranger

2.9L Mafia-Don
Supporting Member
Joined
Sep 22, 2007
Messages
5,346
Reaction score
1,230
Points
113
Location
Michigan
Vehicle Year
1987
Make / Model
Ford
Engine Type
2.9 V6
Engine Size
2.9L
Transmission
Manual
2WD / 4WD
2WD
My credo
A legend to the old man, a hero to the child...
Last year around fathers day i pulled my camper in 90-100* heat. About 3 miles from home the truck started missing intermittantly. Found out to be a plug wire, they were old, so ok.

2 days ago, pulling camper again in 90* heat. Got home, unhooked, now today im getting an intemittant miss AGAIN. Just like before. Im blaming the wires. Ill know for sure this afternoon when i change them.

But my question is...why the hell is this happening? All the heat sheilding is good by the plugs, and the temp gauge only went slightly above 1/2 way when towing it.
 


Rock Auto 5% Discount Code: CFB3B5F7F32B37 Expires: March 30, 2020

RonD

Well-known member
Joined
Jun 2, 2012
Messages
14,536
Reaction score
1,162
Points
113
Location
canada
Vehicle Year
1994
Make / Model
Ford
Transmission
Manual
Probably a spark plug this time not a wire if they are fairly new

You can try running a larger gap 0.048-0.050
That can help with the Richer mix when towing
 

alwaysFlOoReD

Forum Staff Member
Forum Moderator
TRS Banner 2012-2015
TRS 20th Anniversary
Joined
Apr 13, 2009
Messages
10,009
Reaction score
1,076
Points
113
Location
Red Deer, Canada
Vehicle Year
'91, '94, '80
Make / Model
Ford, GMC
Engine Size
4.0,4.0,350
Transmission
Manual
On my race truck I ended up buying Kevlar socks that cover the wires for about 8". That cured cooking the wires. I got them from a hotrod shop but I'm sure Amazon or eBay would sell them too.
 

rusty ol ranger

2.9L Mafia-Don
Supporting Member
Joined
Sep 22, 2007
Messages
5,346
Reaction score
1,230
Points
113
Location
Michigan
Vehicle Year
1987
Make / Model
Ford
Engine Type
2.9 V6
Engine Size
2.9L
Transmission
Manual
2WD / 4WD
2WD
My credo
A legend to the old man, a hero to the child...
Pl
Probably a spark plug this time not a wire if they are fairly new

You can try running a larger gap 0.048-0.050
That can help with the Richer mix when towing
Plugs are only a year old to. They are motorcraft, the wires are o reiley cheapos. Which is prolly 90% of the issue. I forgot i put the cheap turds on it. But its all anyone stocks.

On my race truck I ended up buying Kevlar socks that cover the wires for about 8". That cured cooking the wires. I got them from a hotrod shop but I'm sure Amazon or eBay would sell them too.
Thats a good idea. Ill look into those.

You talkin bout these?
 

Attachments

Last edited:

alwaysFlOoReD

Forum Staff Member
Forum Moderator
TRS Banner 2012-2015
TRS 20th Anniversary
Joined
Apr 13, 2009
Messages
10,009
Reaction score
1,076
Points
113
Location
Red Deer, Canada
Vehicle Year
'91, '94, '80
Make / Model
Ford, GMC
Engine Size
4.0,4.0,350
Transmission
Manual
Pl

Plugs are only a year old to. They are motorcraft, the wires are o reiley cheapos. Which is prolly 90% of the issue. I forgot i put the cheap turds on it. But its all anyone stocks.


Thats a good idea. Ill look into those.

You talkin bout these?
Yes.
 

Bird76Mojo

Well-known member
Joined
Jun 28, 2009
Messages
2,302
Reaction score
923
Points
113
Location
nunya
Pl

Plugs are only a year old to. They are motorcraft, the wires are o reiley cheapos. Which is prolly 90% of the issue. I forgot i put the cheap turds on it. But its all anyone stocks.


Thats a good idea. Ill look into those.

You talkin bout these?

I bought some of those from Amazon and they worked well, but they were nearly impossible to get over the plug wires I bought. I had to open up the metal ring that's sewn in to them on some of them to get the plug wire through. If you were making your own plug wires from a universal kit, it would be a non-issue.

On these plug wires:

https://shop.advanceautoparts.com/p/accel-custom-fit-super-stock-spark-plug-wire-set-4056/6901344-P?cm_mmc=ET-_-Trans-_-Confirmation-_-General#utm_source=et&utm_medium=trans&utm_campaign=confirmation&utm_content=general
 

rusty ol ranger

2.9L Mafia-Don
Supporting Member
Joined
Sep 22, 2007
Messages
5,346
Reaction score
1,230
Points
113
Location
Michigan
Vehicle Year
1987
Make / Model
Ford
Engine Type
2.9 V6
Engine Size
2.9L
Transmission
Manual
2WD / 4WD
2WD
My credo
A legend to the old man, a hero to the child...
Im thinking this winter im gonna just spend the 70 bucks and order a damn set of motorcraft wires
 

alwaysFlOoReD

Forum Staff Member
Forum Moderator
TRS Banner 2012-2015
TRS 20th Anniversary
Joined
Apr 13, 2009
Messages
10,009
Reaction score
1,076
Points
113
Location
Red Deer, Canada
Vehicle Year
'91, '94, '80
Make / Model
Ford, GMC
Engine Size
4.0,4.0,350
Transmission
Manual
Hmmm, I don't know if I installed incorrectly. I just slipped mine over the wire and left the wire ring portion on the outside of the boot. It was the boot that was disintegrating.
 

Bird76Mojo

Well-known member
Joined
Jun 28, 2009
Messages
2,302
Reaction score
923
Points
113
Location
nunya
Mine wouldn't "slip" over the wires at all. Not even close. We had to force them and it resulted in some very sore fingertips by the time it was done. Several of them had to have the metal ring opened up to even go over the plug wire.
 

RonD

Well-known member
Joined
Jun 2, 2012
Messages
14,536
Reaction score
1,162
Points
113
Location
canada
Vehicle Year
1994
Make / Model
Ford
Transmission
Manual
Im thinking this winter im gonna just spend the 70 bucks and order a damn set of motorcraft wires
Call a few Ford Dealers, the parts departments run "tune up" specials, motorcraft plugs and wires for same price as cheaper 3rd party
 

rusty ol ranger

2.9L Mafia-Don
Supporting Member
Joined
Sep 22, 2007
Messages
5,346
Reaction score
1,230
Points
113
Location
Michigan
Vehicle Year
1987
Make / Model
Ford
Engine Type
2.9 V6
Engine Size
2.9L
Transmission
Manual
2WD / 4WD
2WD
My credo
A legend to the old man, a hero to the child...
Well...

I found one with a boot burned 50% off, cylinder #4, same as before. Changed it, drove it home from the shop, same shit. Changed the other 7 and its running like a top.

Im guessing i had a couple that were broken down inside. But its gotta be the underhood heat doing it. Even some of the plastic tubeing the wires had around it by the manifolds were melted.
 


Top