weird misfire. help.
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Elder User
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I should have mentioned that, spark plug routing generally refers to the practice of avoiding particular wires to run parallel with each other for long runs, especially ones that fire consecutively. One wire can induce firing in the other. Not sure this is a problem with modern wire and insulation though. It is good practice to follow factory routing though.
Post Fiend
Joined: Apr 2002
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From: Waterloo, Iowa
You can also try misting the wires and cap area and such with a spray bottle of h2O as well, see if that causes any arcing or stumbling. Does it start hard or run bad in in the rain? Is this truck garaged?
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Elder User
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I didnt see any arching. But it wasnt misfiring too bad and it cleared up in a couple minutes. It will misfire bad tomorrow. Its been dry here so i dont think water is a problem however it has been getting cold so maybe a little bit of humidity in the air could be causing it on start up because it does go away after being driven at highway speeds for a while
Post Fiend
Joined: Apr 2002
Posts: 19,311
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From: Waterloo, Iowa
Couple things - those plug wires are only a year old... Hard to tell from a picture, tho I would guess older. Have you tested them for resistance yet?
Also lots of crud inside the cap, that's not good. Try an OEM FORD distributor cap and rotor and see how that works. The fact that cleaning it out helps is a big tell. It's like carbon tracking, but worse.
Also lots of crud inside the cap, that's not good. Try an OEM FORD distributor cap and rotor and see how that works. The fact that cleaning it out helps is a big tell. It's like carbon tracking, but worse.
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Post Fiend
Joined: Apr 2002
Posts: 19,311
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From: Waterloo, Iowa
Well I can't speak to that. They "should" be OK. You can measure the wires for resistance, they don't necessarily need to be replaced, assuming they pass.
But when it comes to ignition, the best course when troubleshooting a problem is "be right use autolite"! What makes me wonder - and this is WAG - see all that silver colored dust in your rotor cap? I'm wondering if that's not the cause of the late unpleasantness. This would tend to cause internal arcing, possibly. Usually the button in the top is carbon. That looks like aluminum or whatever. But if you're temporarily clearing a fault by cleaning the distributor cap - well it seems like a no brainer. Let us know what you find.
But when it comes to ignition, the best course when troubleshooting a problem is "be right use autolite"! What makes me wonder - and this is WAG - see all that silver colored dust in your rotor cap? I'm wondering if that's not the cause of the late unpleasantness. This would tend to cause internal arcing, possibly. Usually the button in the top is carbon. That looks like aluminum or whatever. But if you're temporarily clearing a fault by cleaning the distributor cap - well it seems like a no brainer. Let us know what you find.
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