[s-cars] Identifying Bad Coil (My 50 cent trick)

[D Cosby]

>From my Audiworld post a few months ago... (works like a charm)

http://forums.audiworld.com/s4s6/msgs/30907.phtml

I couldn't find a spark gap tester... so I made mine out of a 2 pieces of 
wire and the plastic cap off a spray can.

Disconnect the fuel injectors and removed the coil pack cover. I then placed 
one wire on the coil and grounded the other on the block and rolled the 
engine a few times. I kept gaping the wires out farther until the point a 
coil I thought was good wouldn't arc (about 3/4 of an inch). I then moved 
from coil to coil until I found the one which wouldn't arc at this point (#3 
in my case - it would only arc at about 1/2 an inch). Replaced this coil, 
high boost stumble gone, and the car runs great.

Another symptom of my bad coil, was that it would eat plugs, and there was a 
bunch of blow through on the plug crusting up the connector and coil.

Took 30 seconds to make, and 15 minutes to test.

Cheers.
Dwayne
94 S4, T04e-50, FMIC, WI, suspension, big brakes, boost controller... + 
other stuff