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Old 04-03-2013, 07:04 PM   #1
zylent
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Default 2002 wrx bad misfire

When I had my timing done my mechanic pointed out that my car was misfiring, so today I changed my plugs to see if that would correct the issue. None of the plugs seemed to be fouled put, but I changed them anyway. I used ngk iridium one step colder plugs. After the change, my car was misfiring much worse, and ignition timing was all over the place (it was around 13 before). Any ideas? I'm going to check the connections to all the coil packs and clean them but I'm not that knowledgeable with issues like this.

2002 wrx
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Old 04-03-2013, 07:09 PM   #2
jaxscuby
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well you can rule out the plugs unless you gapped them incorrectly.
so that leaves injectors or coil packs
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Old 04-03-2013, 07:32 PM   #3
Concillian
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Listen to Jax.
Move coilpacks around to see if the miss changes cylilnders. If that's not it, move injectors around.

Wouldn't be the first time we've seen either of those issues. Coilpacks are a more common issue.
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Old 04-03-2013, 09:26 PM   #4
zylent
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I checked the gaps on the plugs before installing, ill try wiggling the packs to see if that helps
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Old 04-03-2013, 09:38 PM   #5
zylent
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I think that was it! I wiggled the coil packs back and forth towards the plugs and the idle smoothed out quite a bit, now that I know that was the issue, how do I make sure all the coil packs are seated properly?
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Old 04-03-2013, 10:32 PM   #6
neurosis05
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I don't know how it is on an 02 but on my 05 they seat properly because you bolt them down. I think what they meant by moving coil packs around is move them to a different cylinder. move 1 to 2, 3, to 4. Thats what I got out of it anyhow, maybe I'm missing something. What cylinders are misfiring?

Also I've heard it iridium plugs all come pre gaped and unless your really careful you can screw up the plug even checking them.
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Old 04-04-2013, 11:30 AM   #7
art@grimmspeed
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Quote:
Originally Posted by neurosis05 View Post
I don't know how it is on an 02 but on my 05 they seat properly because you bolt them down. I think what they meant by moving coil packs around is move them to a different cylinder. move 1 to 2, 3, to 4. Thats what I got out of it anyhow, maybe I'm missing something. What cylinders are misfiring?

Also I've heard it iridium plugs all come pre gaped and unless your really careful you can screw up the plug even checking them.
The 02-03's are the same way the coil pack bolts to the valve cover. I would be sure that the wire harness is plugged in correctly and in the right order as the clips have a tendency to break as they get old and brittle.
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