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ANOTHER high boost misfire issue

Impreza


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  #1  
Old 02-07-2012, 09:46 AM
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krarks krarks is offline
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Default ANOTHER high boost misfire issue

After doing a quick search and finding RawRock's topic talking about after he changed his plugs he ran into issues boosting over 14 PSI he found his car missing/hesistating but no real fix or answer.

I find myself in the exact same place. Decided to check the condition of my plugs last night and switch them out for iridiums. (same heat range and gap as the copper ones I took out) The rubber boots that look like they go on the end of the coils were stuck on the old plugs, meaning they had to get destroyed to get the plugs out. Coils didn't have any cracks though.

Swapped out the plugs, reinstalled everything, double checked vac lines, etc and fired it up. Holds idle fine and began driving home. Hit the high way and as soon as the boost gauge hit 14PSI I got the hesitation/misfire and RPMs went down. I can take my car to redline if I don't use boost so I know that it's not RPM specific. Car was boosting fine to 1.1 bar everyday up til now. Regretting touching the damn thing but this was gunna happen at some point I guess.

I have the new style coils ordered (hoping delivery doesn't take forever) and plan to do the conversion, but I'm wondering is there anything else that I could've messed up? I did have the battery out. I have some sort of JDM aftermarket ECM too but like I said everything was fine til now. Not sure how important those little boots that go on the end of the coils are...

Pic of boot:

http://i386.photobucket.com/albums/o...s/9a5bd372.jpg
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Last edited by krarks : 02-07-2012 at 09:56 AM.
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Old 02-07-2012, 09:53 AM
Vr4much? Vr4much? is offline
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check for vaccum leaks, check air filter and potentially clean the maf. I would inspect the coils again, even tiny cracks will cause misfire. I had crazy hesitation under load that was caused by a tiny crack in 1 coil. You should move the ends with your hand, they may be brittle but not showing.

Last edited by Vr4much? : 02-07-2012 at 09:56 AM.
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Old 02-07-2012, 09:55 AM
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MatchstiK MatchstiK is offline
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So right now the coilpacks are installed without the rubber boot on the end? I think definitely that's the problem.
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Old 02-07-2012, 10:11 AM
Soren Soren is offline
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Yeah, the boots are very important. You'll have arcing and misfire without them.
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Old 02-07-2012, 11:19 AM
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Ya the boots are kinda a big deal. For sure get them on the ends.
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Old 02-07-2012, 11:21 AM
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krarks krarks is offline
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Correct , as I literally had no choice (stuck on the plugs) but to wreck them. Kinda figured they might be a cause for my issue. Ah well turned my boost down and will wait for the new coils to arrive. Hopefully that fixes it haha.
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Old 02-07-2012, 11:47 AM
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Jarrod164 Jarrod164 is offline
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Find some used 02+ coilpacks for $80 and never worry again!
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Old 02-07-2012, 11:54 AM
dah_hunter dah_hunter is offline
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I have this same issue..

Sigh,.. i hate these coils.
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Old 02-07-2012, 12:02 PM
AgentJ17 AgentJ17 is offline
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If your coils (old style) were in great shape, but you were still misfiring, could the igniter be bad? I know this is something that is eliminated when you update to the new style coils.
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Old 02-07-2012, 02:20 PM
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RawRock RawRock is offline
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My coils and boots appeared to be in great shape when I inspected them last, which was a few months ago. Even if there are tiny, hardly visible hairline cracks they could begin to misfire. I'm gonna start looking up the coil conversion. Think that's gonna be my next purchase for the car for sure!
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