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Old 09-15-2005, 01:35 AM   #1
spdracr00
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1996 Impreza L
Red

Default anyone have a coil pack for a 2.5 laying around?

I'm pretty sure mine is going out.. sputtering misfire on cyl #3 cel and #3 coil very badly mucked up. cheapest i've found is like $90.. anyway to test one at the junkyard to see if its fine? I've seen the ohm meter test thingy.. just looking for a little advice.
-ben
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Old 09-15-2005, 05:50 AM   #2
Subietonic
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Is this the ohm meter test thingy you were referring to above?

I'm sure you've already checked the plug wires to make sure that they're good and that the valve cover isn't leaking oil into the plug holes and causing the wires to ground out? By "mucked up" - Are you getting carbon buildup on the #3 coil pack plug wire terminal? What makes you think that the coil pack is going bad?

If the #3 plug wire is grounding out, you'll get a misfire. If the #3 plug wire is bad, you'll get a misfire. If the #3 spark plug is bad, you'll get a misfire. In all three instances, you'll likely get carbon buildup on both #3 and #4 coil pack terminals since, IIRC, they both fire at the same time.

I'd start with the plug and work backwards to the coil pack, checking end-to-end resistance, particularly on #3. If any of those are bad replace them. Rule of thumb, replace all four wires at the same time. If one's gone bad, the other three will likely be close behind, at the worse possible time.

Before I'd replace the coil pack, I'd take a Dremel tool with a small wire or stiff bristle attachment and completely remove the carbon buildup from the terminals. If you don't have a Dremel tool, you can always use fine grit sand paper, you'll just have to go at it more slowly. If it's really corroded, then I recommend taking the coil-pack off to work on it so you make sure you get it all cleaned up.

My guess is that this will probably fix the issue, without all the hassle of replacing the coilpack. I know that it did on my BDs and on my BK.

Good luck and keep us appraised.

Dale
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Old 09-15-2005, 01:15 PM   #3
spdracr00
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Red

Default

sweet, great info. Yes Term #3 had a lot of carbon build up. I read that if you clean it that helps so i did that and put some sparkplug grease on the terminal but that didnt fix the issue. Guess next up is pulling the plug and changing wires.

-ben
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Old 09-15-2005, 01:28 PM   #4
Gil
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no. next step is to test and find out what's wrong. don't go changing plugs and wires for the sake of it.
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Old 09-15-2005, 02:13 PM   #5
pilfflip
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If that doesn't work out for you yes, i do have one sitting around PM me if you need it



~Mike
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Old 09-15-2005, 09:44 PM   #6
spdracr00
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sweet, i'll keep that in mind.
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Old 09-16-2005, 12:52 AM   #7
Subietonic
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So you put dielectric grease inside the spark plug wire to coil pack terminal connection? Not sure I would do this unless you can absolutely guarantee a metal-to-metal contact inside that connection. The dielectric grease will insulate/isolate and is not intended to be a conductive material so, if that's what you're using, that may be part of the problem. However, if you've got a good pinch/snap connection that is tight enough to squeeze out the grease and put metal-to-metal, then you should be good to go.

Dale
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