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Can a coil be 1/2 bad?


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#1 poncho62 ONLINE  

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Posted February 18, 2016 - 05:54 PM

I always figured a coil either worked or it didnt.....My 12 hp Kohler "K" engine was running bad, wouldnt rev, backfiring, heating the exhaust pipe so it glowed red.....I went through the carb, changed plug, points, condenser etc......When I changed the coil, that solved the problem. I guess the coil was not firing all the time and possibly at the wrong time.......I have never seen this before...I couldnt see the coil arcing in the dark, like it was cracked or something....Anyone else ever have this happen?



#2 limebuzz OFFLINE  

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Posted February 18, 2016 - 06:46 PM

I had this happen on a CC109 once. Lots of times on a sled,once it's warm she runs like crap.
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#3 toppop52 ONLINE  

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Posted February 18, 2016 - 06:51 PM

Yep, common in cars back in the day.

#4 olcowhand ONLINE  

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Posted February 18, 2016 - 07:05 PM

Oh yes they can be.  Had many over the years fire just enough to run, but not run right.  Had a motorcycle that was acting up and took the tank off to check the coil connections.  All looked good till I turned off the shop lights, then fired it up.  Seen tiny sparks coming from the coil to the laminate plates.  Changed coil out & all was fine.


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#5 MH81 ONLINE  

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Posted February 18, 2016 - 07:27 PM

I've seen them be half fast too
;)
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#6 dodge trucker ONLINE  

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Posted February 18, 2016 - 08:58 PM

1/2 bad IS bad.   you have good and bad no in between.   though it depends on "how" the coil fails within, as to what exact symptoms you may experience/


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#7 Billy M ONLINE  

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Posted February 19, 2016 - 11:25 AM

1/2 bad IS bad.   you have good and bad no in between.   though it depends on "how" the coil fails within, as to what exact symptoms you may experience/

I agree. 

 

Another situation...My coils (or ignition modules to some) seemed to work fine on my Kohler Command in my Ariens Grand Sierra.  I tested the coils while I had the engine out doing the unfortunate/usual head gasket & oil seal replacement.  One coil tested bad, but it ran fine.  It had the recalled coils in it, so I went ahead and put 2 new coils in it to be safe.  I used Kohler coils in it as I didn't want to chance having to pull the motor again to access the coils for replacement.  I'll use aftermarket on a vertical shaft engine with semi-easy coil access.  A horizontal shaft engine on a tractor, not so much.  :D



#8 toppop52 ONLINE  

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Posted February 19, 2016 - 08:53 PM

I understood what he meant, it would run, just not correctly.
I've seen bad condensers do nearly the same.
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#9 dodge trucker ONLINE  

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Posted February 20, 2016 - 10:12 PM

"Recalled coils"???

#10 Billy M ONLINE  

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Posted February 22, 2016 - 09:23 AM

"Recalled coils"???

Yeah...there isn't a whole lot of info out there on the recall now.  I only found a couple really old threads on it.  I asked my local Ariens dealer about it.  They told me the recall is no longer in effect (expired years ago).  I thought it wouldn't hurt to try before buying 2 new coils.



#11 LTD OFFLINE  

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Posted February 26, 2016 - 10:25 PM

I've had a couple that would work intermittently. Also had a couple that would show spark on the tester but was to weak to jump the plug electrodes.






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