how do you test for spark?

[SJ]

> From: Kent McLean <kentmclean at mindspring.com>
> Subject: how do you test for spark?
>
> What's the best way to test for a spark at the spark plugs?
***** I use a store bought plug tester. It looks like a normal plug with
clamp welded to the body. The center electrode is surrounded by the outer
shell which is 1/4 inch away. You can make your own - use a standard plug
and  bend ground electrode so its 1/4 inch away from center electrode.
Connect test plug to center wire of coil(unplug center wire from Dist cap)
The center wire may be a loose fit on the plug - use some aluminum foil
around the plug to take up the slack.
Clamp plug tester to good ground. I also attach a test lead between the
clamp and a known good clean ground.
Crank engine and look for sparks. You should get rhythmic good Blue/white
sparks jumping the gap.
If spark is yellow or orange looking, its on the weak side . . also, the
spark jumping may be hit or miss because of insufficient voltage.

Thats it!

SJ
85 Dodge PU, D-250, 318, auto
85 Audi 4k - - sold but still on the road
88 Audi 5kq
90 Audi 100q

Yo
>
> a) I have one of those little spark testers that let you
>     turn a bolt to adjust the gap.  How big a gap?
>
> b) Failing that (if I can't find the little tool), I'm going
>     to pull a wire at the plug, insert a spare plug into the
>     wire terminal, ground the plug, and then crank it.
>
> Is there another, better way? Patient is my '94 100 V6.
>
> --
> Kent McLean