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Author
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Topic: Anyone with a bad ignition coil experience ?
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Pierre
Gearhead Posts: 366
From: France
Registered: Apr 2002
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posted 09-02-2002 03:15 AM
   
Has anyone ever experienced a situation where an ignition coil will work enough to run the engine but weakly due to an internal spark "leak" or other. I think mine is going south everything else being new (Promaster coil model). Symptoms are occasional vibrations/lower engine power when coil is hot. I thought these things either worked well or didn't !
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V8 Thumper
Gearhead Posts: 3529
From: Orange, Ca. United States of America
Registered: Dec 2001
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posted 09-02-2002 04:23 AM
This may sound kinda strange...For automotive applications, I've personally had them either working or not; not much middle ground. However, my fleet of concrete saws have had on occasion lazy/erradic ignition sympoms that I've ultimately remedied with a replacement coil. Go figure  [This message has been edited by V8 Thumper (edited 09-02-2002).]
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Pierre
Gearhead Posts: 366
From: France
Registered: Apr 2002
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posted 09-02-2002 05:44 AM
Hey V8 T., up early or late party ? 
Thanks for your input, will let ou know the outcome
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Pierre
Gearhead Posts: 366
From: France
Registered: Apr 2002
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posted 09-02-2002 09:31 AM
I have been roaming the web this morning on the topic and it appears that coil failure is far from being a binary thing. They will PARTLY fail under all kinds of circumstances (engine load, heat, cold, ......) resulting in, sometimes, very hard to diagnose ignition misses.
It is interesting to see how many recent cars outthere are being recalled on this issue !!!
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fastford34
Gearhead Posts: 392
From: penna
Registered: May 2002
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posted 09-02-2002 11:01 AM
from experience,heat does strange things to electronic equipment.the real good top notch equipment usually dies,the so-so stuff seems to linger and cause lots of headaches! and of course there is always 1 or 2 good ones that just drive you nuts trying to find the problem cause it works fine until it gets real hot. vibration can mess some of them up also. isnt hot rodding fun? 
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V8 Thumper
Gearhead Posts: 3529
From: Orange, Ca. United States of America
Registered: Dec 2001
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posted 09-02-2002 11:41 AM
quote:
Originally posted by Pierre:
Hey V8 T., up early or late party ?
No such luck  My two year old son climbed into bed , then proceded to whoop the crap out of mommy and daddy... he's such a restless sleeper! So I got up for a bowl of cereal and play on the puter for a bit
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Pierre
Gearhead Posts: 366
From: France
Registered: Apr 2002
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posted 09-03-2002 10:03 AM
Temporarely replaced my MSD-6A (brand new) + Promaster coil with a standart ignition set up and it ran much cleaner.....that is until I lost oil pressure (see my other post).
The old coil was indeed my problem
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Moneymaker
Administrator Posts: 19751
From: Lyons, IL, USA
Registered: May 99
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posted 09-03-2002 10:06 AM
I have seen them fail every way possible.  ------------------
Alex Denysenko
Co-Administrator and Moderator/ non 65-66 Mustang owner sensitivity co-ordinator NHRA/IHRA/SRA/MCA member
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Part time secret agent license #0089
Professional Manwhore
The Barry of BarrysGrrl Quote: "I never met a magazine mechanic I liked."
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MidLifCrisis
Gearhead Posts: 282
From: USA
Registered: Oct 2001
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posted 09-03-2002 09:46 PM
I had gotten a used yellow top coil for my '66 Mustang 2+2 and proudly installed it to complete the retro/original look. The next day the car dies on the way to work. I thumb the rest of the way in. I then catch a ride from a co-worker back to the car, and it fires right up. I drive it to within three blocks from home and it dies again. The culprit? The yellow top coil! It would ground or short out or something once the engine got warmed up. Replaced it with a new regular black coil and everything is good. Next time I'm going chrome. Charlie. [This message has been edited by MidLifCrisis (edited 09-03-2002).]
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PonyDoc
Journeyman Posts: 92
From: Ft. Lauderdale
Registered: Jun 2001
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posted 09-05-2002 11:54 PM
As others have said, they can fail differently. I had a 57 Fairlane with a weak coil that died when hot. My 64 1/5 just went thru 2, as it cut out under load. The one I put in works just fine. All the others were older originals. I think they just start to break down when they get too hot. I put a piece of gasket material under the bracket on this one, and have had no problems.
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