[Diy_efi] Testing an inductance coil.

[Mike]

If a coil has a shorted turn it wont return much back emf,

If you briefly touch the primary and interrupt and get a
spark across the input - without suppressor cap then its
likely ok, dont touch it for more than a glancing strike.

Thats a quick and nasty way of checking if your coil
is ok and doesnt have a shorted turn...

Of course if you also get a nice secondary spark then its
more than likely ok, dont be near fragile objects when you touch it
though ;-)


Regards from


Mike
Perth, Western Australia
VL Commodore Fuse Rail that wont warp or melt !
Twin Tyres for most sedans
http://niche.iinet.net.au




At 09:55 AM 8/18/05, you wrote:
>This answer is what I was afraid of.  Needing test equipment I ain't got.  I'll do the continuity test, see if I see anything with the voltmeter, and go from there.
> 
>Thanks guys.
> 
>Joe
>-----Original Message-----
>From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org]On Behalf Of Djfreggens at aol.com
>Sent: Wednesday, August 17, 2005 5:54 PM
>To: diy_efi at diy-efi.org
>Subject: Re: [Diy_efi] Testing an inductance coil.
>
>In a message dated 8/17/2005 5:41:14 P.M. Eastern Standard Time, WSCowell at aol.com writes:
>Good grief... there is no suggestion the coil has shorts, and I DID advise use of an oscilloscope, by far the best test.  It would tell whether the coil is doing its job as a CT.  Unless you have design info you won't know the design inductance etc.
> 
>NB we are of course not talking about injectors here, nor ignition coils.  My advice was very sharply focused on the subject matter presented...  It never hurts to address the question asked.  :-)
> 
>Will C
>
> 
> 
>   I was not following the thread its just time to end it. the best way to test a coil is with current ramping via a low amps probe and use an oscilloscope to graph the used current wave form. this only comes from years of diagnosing bad inductive coils on engine control systems for 15 yrs. best of luck trying to use a voltage wave form. 
> 
> 
>
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