Quote:
Originally Posted by d4m45cuz
So, after 60+ miles of driving, no CEL. Seeing as I got a CEL with p0351 while leaving the dealership after my DI seal replacement (and many times subsequent), I think I can safely assume the issue has been resolved. If I had to guess, the breakdown of what causes this goes something like this:
1) Coil goes bad due to overheating (will know more once I take my old coil apart)
2) Bad coil causes overheating in the cylinder. This could be caused by a few things including misfires and/or ECU leaning the mixture in cyl #1 due to incomplete fuel burn.
3) Overheating causes premature degradation of DI seals.
I would get the p0351 codes PRIOR to the seals having gone bad and the firecrackers starting. This tells me the issue is caused by the coils having gone bad.
I have applied the JDM Transient Ignition Retard timings to my ROM via epifan's BRZedit software. Shout out to epifan for being on top of the many different ROMs out there and providing the JDM ROM to me for comparison and merging.
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I don't think the ecu can trim fuel per cylinder and even if it could, we only have a single up stream 02 sensor so it would not know which cylinder to trim.
If you look at the per cylinder timing compensation maps, cylinders 1 & 2 have almost 4 degrees of timing pulled out from 3600 to 4800 .7 g/rev and up and 2.5 degrees pulled from 6800 to redline.... This could cause higher EGT's on 1 & 2 i think, or pehapse it's not enough retard to increase egt's and they are limiting power on 1 & 2 due to thermal concerns??????
It is very strange that #1 coilpack seems to go bad so often and the two could certainly be linked but I don't think the coilpack issue could cause detonation, but i am assuming the mode of failure is for the plug not to fire at all or very weekly when the coil pack has issues so.... I do agree that heat could be the major cause of coil pack failure and it's possible #1 gets the least air circulation or something.