For the last couple of weeks i have been getting random misfires that started with a bad camshaft adjustment valve (n205) I replaced this part but my misfires continued. Its always Cylinder 1 that misfires and it seems to happen at lower RPM or idle. Odd thing is I drive the car for a while or drive it hard and it disappears. Till it comes back 2 days later. I have tried moving coil packs around to see if it was a bad pack but that hasn't done anything, i don't think its a vacuum problem because there isn't any fluttering from my boost gauge and i get a consistent idle at -22.
I talked to my mechanic today he looked briefly at the car, I explained my problems and he came up with a very bizarre answer. He thought maybe when I originally had my camshaft (rev. A) replaced at 35000 Km. (i am at 95,000km right now) that maybe one of the lifters was damaged from the camshaft problem and they never noticed/replaced it. Looking at my service sheet from my dealer there is no mention of lifters. But to be honest i don't really think this is the case.
I would think if i had a damaged lifter i would have noticed something by now. Its been almost 4 years and 60,000 km since. Also wouldn't be causing misfires all the time? not just at idle/low rpm?
I am going to take the car for a second opinion with another mechanic, to be honest i think my misfires are from carbon buildup but i am not 100% sure.
Any ideas would be helpful!
Thanks in advance.