after $350, You would think it would be fixed
I had to use another user name my email is messed up, but anyway I took the Forester in last week to the dealer to see if they could better diagnose the problem, they said the one month old coil pack was bad, so they replaced it and I assumed that everything would be fine. But less than a week later, same 3 and 4 misfire.
I gave the tech everything that I have done in the last few months and I even had to replace the weak battery a few days ago.
to recap, about a month ago, I had a 1,2,3,4 misfire. The car would barely run so I replaced the plugs with oem ngks. I checked the coil pack and the secondary resistance was out of range from the goodwrench.com specs. I then replaced the coil pack and the car ran fine for a couple of weeks. Then the 3 and 4 misfire began. I replaced the front o2 sensor as well. The coil pack was replaced again at the dealer last week.
The plug wires are oem from the dealer and are less than a year old and the resistance is within specs. The plugs are fine, the fuel filter was replaced a few months ago. The car had its 105k service before I bought the car where the subaru dealer replaced the tbelt and adjusted the valves.
This car ran fine for about 20k miles before this headache began.
Im taking the car back to the dealer tomorrow so if anyone has any ideas, this would be great. This is the 4th subaru I have owned and I have never had any problems, even with the last one that I gave to my dad after 230k miles. If this problem persists, I guess this car will go in on trade for something that runs. Thanks guys