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No spark on one side of coil pack
Posted 18 January 2011 - 12:18 PM
1997 Legacy with a 2.2L motor.
Car ran rough intermittently, then bogged down at idle while in gear, then just died. He's replaced fuel filter, coil pack, and we just put in another ignitor with no change.
We get spark to 3 & 4, but not 1 & 2. We've traced wiring from the ignitor to the coil and it's good, but we can't seem to figure out which pin from the ECU goes out to the ignitor. (well at least we couldn't figure it out yesterday before my back forced me to quit)
Any suggestions what this gremlin could be?
Posted 18 January 2011 - 12:45 PM
might be odd, but it is possible the plug wires are bad if there is power going to the coil pack, but not producing spark at the spark plug?
Posted 18 January 2011 - 01:50 PM
Is the "new" coil pack brand new or used?
Posted 18 January 2011 - 03:17 PM
We're trying to eliminate the possibility that it's a bad wire to the ignitor from the ECU, but can't find a decent diagram or pinout chart (that shows which pin on the plug is which)
It seems as if the ECU is sending a signal to fire one pair of cylinders, but not the other. I don't have a manual, so I don't know if the ECU triggers the ignition off the crank or the cam position sensor. If it's one of these 2, how do we go about checking it with a test light and digital multi-meter as the only electronic diagnostic tools available?
Every time I think about it I want a LARGE beer!
Posted 18 January 2011 - 04:09 PM
My second guess is something that happend to me is one of the tabs on the crank sprocket for the spark got busted off i assume a rock got thrown up into it (no covers).
hope that helps Rob.
Edited by subaruguru, 18 January 2011 - 04:12 PM.
Posted 18 January 2011 - 04:10 PM
Did you try a third ignitor? I've seen them fail where only half the coil would fire.
Posted 18 January 2011 - 05:09 PM
pm me e mail and I'll send them that way.
Edited by ocei77, 18 January 2011 - 05:14 PM.
Posted 18 January 2011 - 05:51 PM
The Crank and Cam angle sensors can only be checked with an analog multimeter or Oscope. Doubtful it's either of those since the ECU would not see the signal it wants from those sensors. I would think it would not fire at all if that were the case.
Posted 19 January 2011 - 09:15 PM
Here is a link that shows some good shots of the engine. Check out the 34th picture. It shows good detail of the reluctor tabs behind the crank sprocket and the crank sensor above it.
Edited by Cougar, 19 January 2011 - 09:19 PM.
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