Hi timjohnone. Welcome to the forum. Battery voltage is fed to each coil on the dark green / light green stripe wire. The control wire should be pulsing. If you use a test light on the other wire, tan / orange in this case, the light should be fairly dim. Check on a good coil to see what normal looks like. A digital voltmeter will be misleading because the reading will bounce around between 12 and 0 volts. The glow of a test light will smooth out the effect of the pulses.
If you find the test light is off on the tan / orange wire, that wire is grounded or the driver stage in the Engine Computer is shorted. Either way, that cylinder will also be misfiring. Stop the engine, disconnect that coil, then use an ohm meter to measure the resistance between the tan / orange wire and ground. If it is near 0 ohms, unplug the connector C1 from the Engine Computer and measure again. If it is still real low, that wire is grounded. If the resistance goes up to an open circuit, (infinite), the short is in the Engine Computer.
If everything checks ok resistance-wise, swap the coil with one of the other ones. If the same coil starts to smoke, it's the coil itself that is defective or it's for the wrong application.
Monday, April 19th, 2010 AT 5:39 PM