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Author
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Topic: Random vibration .........Solved !!
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Pierre
Gearhead Posts: 349
From: France
Registered: Apr 2002
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posted 06-03-2002 08:46 AM
  
A faulty # 4 wire (partially melted on 4-in-1 exhaust  )was the origin of my problem. Difficult to diagnose since wires were brand new and damage area very little. A spark between the wire and the exhaust was in certain condition "leaking". So I fixed that and ordered an MSD-6A to further reinforce ignition quality.Thanks all of you for your help
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V8 Thumper
Gearhead Posts: 2830
From: Orange, Ca. United States of America
Registered: Dec 2001
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posted 06-03-2002 08:49 AM
whew! I'm glad that's all it was  Was that plug missing often enough to discolor?
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Pierre
Gearhead Posts: 349
From: France
Registered: Apr 2002
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posted 06-03-2002 09:18 AM
Not obviously (the plugs only have a few thousand miles), but I think that the plug was still firing but weaker.
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Pierre
Gearhead Posts: 349
From: France
Registered: Apr 2002
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posted 06-03-2002 09:28 AM
Also.........I observed through my extensive investigations that ignition (as a whole)did not perform as well in wet/humid weather, which makes the engine a little less smoothIs this something well known ?
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mellowyellow
Gearhead Posts: 5469
From: So. Fl.
Registered: Aug 2000
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posted 06-03-2002 04:10 PM
Have you met Wolfgang (T-5) at any shows, etc. He's from Germany. Has a nice Bullitt replica! Good guy!
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Pierre
Gearhead Posts: 349
From: France
Registered: Apr 2002
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posted 06-03-2002 04:18 PM
Nope, don't know the guy. Will try to contact him through email. Up until last year I would not have trusted my car to go too far (Now I am sure it would outlast my Renault diesel  )
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SteveLaRiviere
Administrator Posts: 30261
From: Saco, Maine
Registered: May 99
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posted 06-03-2002 06:59 PM
quote:
Originally posted by SteveLaRiviere:
You need to find someone with an scope, and check out the 'spikes' which is the electrical signature as each cylinder fires. That may show you something. I've found intermittant skips that way many times. What you may not see or feel could really show up there. Have you compared the resistance of all your spark plug wires?
------------------
'70 Mustang Mach 1 ~ '72 Mustang Sprint ~ '94 F-150
MCA Member # 47773 "Doubt is not a pleasant condition, but certainty is absurd."
- Voltaire
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mustangs68
Moderator Posts: 16507
From: Hampton,Virginia,USA MCA#39406 M&M #12
Registered: May 99
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posted 06-03-2002 08:29 PM
I bough some covers (inslated)for my wires to keep them from being "burned" by the headers,
sam
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Pierre
Gearhead Posts: 349
From: France
Registered: Apr 2002
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posted 06-04-2002 04:01 AM
quote:
Originally posted by SteveLaRiviere:
Yep, Steve, I did listen to your advice: A standard electronic scope connected to the magnetic censor from my timinig light worked wonders
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SteveLaRiviere
Administrator Posts: 30261
From: Saco, Maine
Registered: May 99
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posted 06-04-2002 07:17 PM
Isn't it a relief to finally fix a nagging problem like that? ------------------
'70 Mustang Mach 1 ~ '72 Mustang Sprint ~ '94 F-150
MCA Member # 47773 "Doubt is not a pleasant condition, but certainty is absurd."
- Voltaire
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Pierre
Gearhead Posts: 349
From: France
Registered: Apr 2002
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posted 06-05-2002 07:08 AM
OOOHH, YEP
Especially that my plan was already set to take the engine out this winter and have a complete dynamic balancing done on all rotating parts which would have costed me $1000+ and done nothing to the problem !! I guess the proper expression in this case would be LOL ! No?
(I see this all the time but what does it mean ?)
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V8 Thumper
Gearhead Posts: 2830
From: Orange, Ca. United States of America
Registered: Dec 2001
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posted 06-05-2002 07:55 AM
Laugh Out Loud
 [This message has been edited by V8 Thumper (edited 06-05-2002).]
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