Same. I also started to experience the misfires around 20k miles after installing the plugs. Well, at least it was more noticeable around that time. It is the most noticeable when my car idling. I remember sitting in a drive-thru lane and initially thinking that I was feeling slight bass from my car stereo or a nearby car. Twas strange

I have also noticed that my acceleration seems laggy in lower gears. I have a 6MT with a RV6 v3 j-pipe and that pipe had fixed any previous issues that I had with torque at lower rpms.

Still need to install the new plugs when I have some free time to see if it fixes those issues.

 

Didn't get to change them yet cause store closed but just checked gap on one and it's set to 63 so that's way too big. I had them installed by a mechanic with my timing belt and water pump 20m miles ago so didn't check the gap before.

 

Removed a 2nd and found a piece of rubber from the old coil stuck in there is that might be something

 

good job investigating!

 

Is the plug supposed to be pointy like that? All Theo there I've seen have been flat. I'm picking u ones plugs tomorow so no use in regapping those for now

 

yeah, i googled ngk iridium's and they are pointy.
Just learned something new...the pointy part is the iridium center.

 

Yeah, they're supposed to be like that.

 

Well took it out for a short drive to take some pics and ended killing another original coil pack so gonna buy a few Denso off of rock auto to keep on hand and throw in the cheap one from advanced for now to stop it from misfiring while moving it around the garage

 

there's something else at play!


could it be that the a/c drain line or sunroof drain line is plugged, spilling water on the ecu, shorting out the coil packs!?!??!

 

might need to look at the ac line but the car doesn't see rain and has gone long enough without being washed for it to be getting to the ecu plus I'd know cause recently did a whole interior swap. And I think it was just a coincidence cause it's still an original from 2004

 

So after changing spark plugs with brand new ones and replacing that coil that went bad the car seems good. I've driven it twice for over 30 mins and have had no problems at all but I am buying a gauge to keep an eye on air/fuel ratios jsut because I'm curios and if I end up installing nitrous or some type of fi later on or on a different car I would need anyways.