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Author Topic:   spark plug boot exposed
rockafellz
Gearhead

Posts: 1443
From: San Lorenzo, CA, USA
Registered: Aug 2001

posted 03-21-2003 10:45 AM     Click Here to See the Profile for rockafellz   Click Here to Email rockafellz     Edit/Delete Message   Reply w/Quote
Hey All,

I was thinking about my MSD problem on the way to work this morning and remembered that my #5 spark plug boot was slightly melted and exposed from the previous owner. It isn't touching anything now, but is about 3/4" away from the header. What are the things that can happen with an exposed spark plug boot? Can it cause some sort of failure to the distributor or the 6AL?

Thanks in advance.

Erik

------------------
1966 Ford Mustang 2+2
Mine - Restomod in Progress

1966 Ford Mustang Coupe
Dad's - Original Unrestored

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SteveLaRiviere
Administrator

Posts: 44921
From: Saco, Maine
Registered: May 99

posted 03-21-2003 10:53 AM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
It can give you a intermittant skip. A high energy ignition can jump a 3/4" gap under the right conditions, I'd bet.

Stop exposing your boot!

------------------
'70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150

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rockafellz
Gearhead

Posts: 1443
From: San Lorenzo, CA, USA
Registered: Aug 2001

posted 03-21-2003 10:57 AM     Click Here to See the Profile for rockafellz   Click Here to Email rockafellz     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by SteveLaRiviere:
It can give you a intermittant skip. A high energy ignition can jump a 3/4" gap under the right conditions, I'd bet.

Stop exposing your boot!


Could you go into detail? I'm not quite understanding what you meant. What would the motor do if it jumps a 3/4" gap?

Thanks SteveL!! Oh, i've been super busy at work lately, but i'll make sure to email you hopefully this weekend.

Erik

------------------
1966 Ford Mustang 2+2
Mine - Restomod in Progress

1966 Ford Mustang Coupe
Dad's - Original Unrestored

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SteveLaRiviere
Administrator

Posts: 44921
From: Saco, Maine
Registered: May 99

posted 03-21-2003 11:05 AM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
Electricity is always trying to find the path of least resistance. If it's easier to jump the gap to your header that it is to go through your spark plug, it will pick the header. Weak wires often leak juice, a good check is to open your hood in the dark with the engine running, sometimes you see a very impressive lightning show. Often you can even hear the snapping as the spark jumps to ground.

------------------
'70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150

Please remember our sponsors,
Mustangs Plus, NPD, Osborn Reproductions, MyFordPerformance.com, and FordRamAir.com

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rockafellz
Gearhead

Posts: 1443
From: San Lorenzo, CA, USA
Registered: Aug 2001

posted 03-21-2003 11:09 AM     Click Here to See the Profile for rockafellz   Click Here to Email rockafellz     Edit/Delete Message   Reply w/Quote
Would that explain my ignition dying at low speeds? I assume no, but figured it might be worth asking.

Erik

------------------
1966 Ford Mustang 2+2
Mine - Restomod in Progress

1966 Ford Mustang Coupe
Dad's - Original Unrestored

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SteveLaRiviere
Administrator

Posts: 44921
From: Saco, Maine
Registered: May 99

posted 03-21-2003 11:20 AM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
No, not dying, just skipping, aka missing.

Dying is probably a module or coil, most likely.

------------------
'70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150

Please remember our sponsors,
Mustangs Plus, NPD, Osborn Reproductions, MyFordPerformance.com, and FordRamAir.com

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