On 3 Apr 2008 00:27:10 GMT, Jim Yanik <jyanik@[EMAIL PROTECTED]
> wrote:
>COILS are not considered -electronic- devices(electrical,not
>electronic),and are not "sensitive",even "moderately".
>"electronics" would be the ECM and the semiconductor circuits that switch
>the coil primary current.
>Problems coils have are bad windings or bad encapsulation/insulation,or
>improper currents applied to them.(an external problem,not of the coil
>itself).
I'd agree that a coil of wire is unlikely to go bad unless shorted,
etc. FWIW, some do have small switching devices in them.
The bottom line is that there is an unreasonably high failure rate
(MHO) on these coils. It's not a strict manufacturing issue when it
takes 60K or more miles (or the related time baking) for them to go.
Perhaps the bad ones have bad tolerances, but then the manufacturing
process has fairly major issues, and across manufacturers. I'd think
that it was unlikely so many manufacturers just couldn't get it right
- and it's the design that is just inherently prone to failure from
heat and vibration.
|
