Quote:
Originally Posted by Jeffvette
Not always true, sometimes the coil will fail on an individual tower. I've seen it a couple of times.
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Technically impossible but I suppose ther could be something I don't understand about the failure that would have such a symptom.
I'd sure like to get a hold of one that fails on just one side.
You may have not seen the failure but I wonder if it wasn't still failing?
Or maybe one of the two ignition wires was arcing to ground.
Each of the four coils fire on two plugs at the same time.
Once on compression and once on exhaust stroke. If one plug is very fouled it may not show spark at all and the other will. Next time you see what you think is "one tower" fireing. Try unplugging both sides and place a known good plug in each and ground the outside of each plug. The spark on each should be the same even if the coil is failing. The trick is to compare a good coil to a bad one. Depending on how bad the coil is you'll see a marked difference. Best check I've seen on the net was measuring the secondary coild resistance when the coil is hot. With wires disconnected it will be about 5.7 ohms acording to my notes.