Ragnyl

Hello everyone, been a long time follower of the forum, just never had a reason to post until now. Anyways, I've been dealing with an on going misfire for awhile now, and I'm just about ready to pull my hair out trying to figure it out. I prefer to do all the work I can on my car, and with a baby on the way in 3 weeks, the money saving are priority too.

So here is the history of what all I've done this far to try and fix. Car is currently sitting at 102k miles. It originally started as a random misfire eventually throwing codes for all cylinders. I proceeded to do a valve adjustment and put fresh plugs in at 101k. Nothing crazy was found while doing valve adjustment. Some tight, some loose, but no extremes. After the adjustment the misses were still there but didn't feel quite as frequent. I checked my vacuum lines, all seemed fine. Cleaned my iac valve, didn't change anything. Confirmed injectors were at least all firing rhymthicly via the old screw driver to ear method. Pulled the MAF gave it a good shake in case there was something stuck within. Still nothing. So then the other night I decided to re pull the plugs to check how they look, all 4 look the same and good color. I decided to regap them from .043 to closer to the tight end of the recommended gap (.040). This fixed my misfires for a day and dramatically reduced the frequency of misfire, but then they came back. So then I felt that given the mileage, perhaps the coils were just getting weak and closing the gap allowed them to spark better to compensate for lack of power. Replaced all the coils with fresh denso coils. Seemed great that night, seemed to run fine. Next morning into work, car throws cylinder 2 misfire. And now it will consistently throw misfire for cyl 2 only. I plan on pulling the injectors this after noon and swapping 2 and 4 to see if the misfire follows the injector, and doing a compression test on all cylinders just to rule that out. But I feel if something seriously wrong was going on in there, the plugs would show it.

Anyways, sorry for the long winded first post! Any help or advice on how to move forward would be much appreciated.

Ragnyl

Did a compression check on all cylinders, did twice to average them out. Came back with cyl 1 222, 226. Cyl 2 230, 231. Cyl 3 235, 232. Cyl 4 235, 235.
So at least my compression seems healthy. Haven't gotten to swap injectors yet. Will post an update if that is the culprit.