Rerouting Plug Wires Cures Stumble
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Fleet Mechanic
Joined: Apr 2008
Posts: 1,724
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From: Vancouver BC Canada
Rerouting Plug Wires Cures Stumble
Just wanted to post a tip for others who may have similar issues. I've always had a slight hesitation or stumble under load at highway speeds. Truck has run well except for this issue. I just recently rerouted the plug wires taking care to keep them all as far away from each other as possible. The result is that the stumble / hesitation has disappeared and the 351 actually feels like one now when I need it.
Hope this helps.
Hope this helps.
More Turbo
Joined: Apr 2008
Posts: 649
Likes: 0
From: Cottageville, WV
You might try misting the wires after dark to see if arcing occurs. Use a water bottle that sprays a mist. When you find arcing either move or replace those wires. I had a slight stumble on my 88 F150 with the 4.9 and it turned out to be the egr.
Posting Guru
Joined: Jun 2003
Posts: 2,314
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From: southwest michigan
Just wanted to post a tip for others who may have similar issues. I've always had a slight hesitation or stumble under load at highway speeds. Truck has run well except for this issue. I just recently rerouted the plug wires taking care to keep them all as far away from each other as possible. The result is that the stumble / hesitation has disappeared and the 351 actually feels like one now when I need it.
Postmaster
Joined: Dec 2007
Posts: 3,052
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From: Jacksonville FL
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Posting Guru
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Fleet Mechanic
Joined: Apr 2008
Posts: 1,724
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From: Vancouver BC Canada
Sorry. I'd post pics but my wife has "misplaced" our digital camera so I can't take any pics right now. I can tell you that I removed most of the wire holders. The back drivers side wire I ran behind the coil. The back passenger's side wire went through the upper manifold. Doesn't look very good but cured my issues. I didn't have a plan, just went at it with the idea of keeping the wires as seperate as possible.
I like that msd cap. Looks much easier to keep the wires apart.
I like that msd cap. Looks much easier to keep the wires apart.
Cargo Master
Joined: Mar 2007
Posts: 2,935
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From: Arcadia, Fla
Somewhere on here I seen a Ford diagram that shows proper wire routing... Finaly found some info.
https://www.ford-trucks.com/forums/6...e-routing.html
https://www.ford-trucks.com/forums/6...e-routing.html
Posting Guru
Joined: Jun 2003
Posts: 2,314
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From: southwest michigan
I thought this was kind of interesting. It shows where crossfire is common on certain engines
http://www.jasperengines.com/pdf/Spa...oss-FireTB.pdf
http://www.jasperengines.com/pdf/Spa...oss-FireTB.pdf
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