On Mon, 07 Mar 2011 11:14 -0800, "PICdude" wrote:
> With wasted spark, you should see the same amount of pulses.  All it =20
> really does is tie two plugs to one point on the distributor, so the =20
> spark pulse on a cylinder's exhaust stroke is the same as on another =20
> cylinder's compression stroke, and hence it does not affect the number =20
> of pulses seen at the ignition coil.  It's done to simplify the system =20
> (less components).

On a 1998 Mustang I had it also meant two different types of spark plugs
- positive and negative!

They wanted to platinize the plugs, but wanted to save a little money
and platinized the main electrode on half of them and the ground
electrode on the others.

Note to self: get double platinum plugs to save having to figure out
which is which!

Cheerful regards,

Bob


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